sqlhelper中文资料
using
System;
using System.Data;
using System.Xml;
using System.Data.SqlClient;
using System.Collections;
/// <summary>
/// SqlServer 数据访问帮助类
/// </summary>
public sealed class SqlHelper
{
#region 私有构造函数和方法
private SqlHelper() { }
/// <summary>
/// 将SqlParameter参数数组(参数值)分配给SqlCommand命令.
/// 这个方法将给任何一个参数分配DBNull.Value;
/// 该操作将阻止默认值的使用.
/// </summary>
/// <param name="command"> 命令名 </param>
/// <param name="commandParameters"> SqlParameters数组 </param>
private static void AttachParameters(SqlCommand command, SqlParameter[] commandParameters)
{
if (command == null ) throw new ArgumentNullException( " command " );
if (commandParameters != null )
{
foreach (SqlParameter p in commandParameters)
{
if (p != null )
{
// 检查未分配值的输出参数,将其分配以DBNull.Value.
if ((p.Direction == ParameterDirection.InputOutput || p.Direction == ParameterDirection.Input) &&
(p.Value == null ))
{
p.Value = DBNull.Value;
}
command.Parameters.Add(p);
}
}
}
}
/// <summary>
/// 将DataRow类型的列值分配到SqlParameter参数数组.
/// </summary>
/// <param name="commandParameters"> 要分配值的SqlParameter参数数组 </param>
/// <param name="dataRow"> 将要分配给存储过程参数的DataRow </param>
private static void AssignParameterValues(SqlParameter[] commandParameters, DataRow dataRow)
{
if ((commandParameters == null ) || (dataRow == null ))
{
return ;
}
int i = 0 ;
// 设置参数值
foreach (SqlParameter commandParameter in commandParameters)
{
// 创建参数名称,如果不存在,只抛出一个异常.
if (commandParameter.ParameterName == null ||
commandParameter.ParameterName.Length <= 1 )
throw new Exception(
string .Format( " 请提供参数{0}一个有效的名称{1}. " , i, commandParameter.ParameterName));
// 从dataRow的表中获取为参数数组中数组名称的列的索引.
// 如果存在和参数名称相同的列,则将列值赋给当前名称的参数.
if (dataRow.Table.Columns.IndexOf(commandParameter.ParameterName.Substring( 1 )) != - 1 )
commandParameter.Value = dataRow[commandParameter.ParameterName.Substring( 1 )];
i ++ ;
}
}
/// <summary>
/// 将一个对象数组分配给SqlParameter参数数组.
/// </summary>
/// <param name="commandParameters"> 要分配值的SqlParameter参数数组 </param>
/// <param name="parameterValues"> 将要分配给存储过程参数的对象数组 </param>
private static void AssignParameterValues(SqlParameter[] commandParameters, object [] parameterValues)
{
if ((commandParameters == null ) || (parameterValues == null ))
{
return ;
}
// 确保对象数组个数与参数个数匹配,如果不匹配,抛出一个异常.
if (commandParameters.Length != parameterValues.Length)
{
throw new ArgumentException( " 参数值个数与参数不匹配. " );
}
// 给参数赋值
for ( int i = 0 , j = commandParameters.Length; i < j; i ++ )
{
// If the current array value derives from IDbDataParameter, then assign its Value property
if (parameterValues[i] is IDbDataParameter)
{
IDbDataParameter paramInstance = (IDbDataParameter)parameterValues[i];
if (paramInstance.Value == null )
{
commandParameters[i].Value = DBNull.Value;
}
else
{
commandParameters[i].Value = paramInstance.Value;
}
}
else if (parameterValues[i] == null )
{
commandParameters[i].Value = DBNull.Value;
}
else
{
commandParameters[i].Value = parameterValues[i];
}
}
}
/// <summary>
/// 预处理用户提供的命令,数据库连接/事务/命令类型/参数
/// </summary>
/// <param name="command"> 要处理的SqlCommand </param>
/// <param name="connection"> 数据库连接 </param>
/// <param name="transaction"> 一个有效的事务或者是null值 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本, 其它.) </param>
/// <param name="commandText"> 存储过程名或都T-SQL命令文本 </param>
/// <param name="commandParameters"> 和命令相关联的SqlParameter参数数组,如果没有参数为'null' </param>
/// <param name="mustCloseConnection"><c> true </c> 如果连接是打开的,则为true,其它情况下为false. </param>
private static void PrepareCommand(SqlCommand command, SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, out bool mustCloseConnection)
{
if (command == null ) throw new ArgumentNullException( " command " );
if (commandText == null || commandText.Length == 0 ) throw new ArgumentNullException( " commandText " );
// If the provided connection is not open, we will open it
if (connection.State != ConnectionState.Open)
{
mustCloseConnection = true ;
connection.Open();
}
else
{
mustCloseConnection = false ;
}
// 给命令分配一个数据库连接.
command.Connection = connection;
// 设置命令文本(存储过程名或SQL语句)
command.CommandText = commandText;
// 分配事务
if (transaction != null )
{
if (transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
command.Transaction = transaction;
}
// 设置命令类型.
command.CommandType = commandType;
// 分配命令参数
if (commandParameters != null )
{
AttachParameters(command, commandParameters);
}
return ;
}
#endregion 私有构造函数和方法结束
#region ExecuteNonQuery命令
/// <summary>
/// 执行指定连接字符串,类型的SqlCommand.
/// </summary>
/// <remarks>
/// 示例:
/// int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders");
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本, 其它.) </param>
/// <param name="commandText"> 存储过程名称或SQL语句 </param>
/// <returns> 返回命令影响的行数 </returns>
public static int ExecuteNonQuery( string connectionString, CommandType commandType, string commandText)
{
return ExecuteNonQuery(connectionString, commandType, commandText, (SqlParameter[]) null );
}
/// <summary>
/// 执行指定连接字符串,类型的SqlCommand.如果没有提供参数,不返回结果.
/// </summary>
/// <remarks>
/// 示例:
/// int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本, 其它.) </param>
/// <param name="commandText"> 存储过程名称或SQL语句 </param>
/// <param name="commandParameters"> SqlParameter参数数组 </param>
/// <returns> 返回命令影响的行数 </returns>
public static int ExecuteNonQuery( string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
using (SqlConnection connection = new SqlConnection(connectionString))
{
connection.Open();
return ExecuteNonQuery(connection, commandType, commandText, commandParameters);
}
}
/// <summary>
/// 执行指定连接字符串的存储过程,将对象数组的值赋给存储过程参数,
/// 此方法需要在参数缓存方法中探索参数并生成参数.
/// </summary>
/// <remarks>
/// 这个方法没有提供访问输出参数和返回值.
/// 示例:
/// int result = ExecuteNonQuery(connString, "PublishOrders", 24, 36);
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符串/param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="parameterValues"> 分配到存储过程输入参数的对象数组 </param>
/// <returns> 返回受影响的行数 </returns>
public static int ExecuteNonQuery( string connectionString, string spName, params object [] parameterValues)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果存在参数值
if ((parameterValues != null ) && (parameterValues.Length > 0 ))
{
// 从探索存储过程参数(加载到缓存)并分配给存储过程参数数组.
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
// 给存储过程参数赋值
AssignParameterValues(commandParameters, parameterValues);
return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
// 没有参数情况下
return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行指定数据库连接对象的命令
/// </summary>
/// <remarks>
/// 示例:
/// int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders");
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="commandType"> 命令类型(存储过程,命令文本或其它.) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <returns> 返回影响的行数 </returns>
public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText)
{
return ExecuteNonQuery(connection, commandType, commandText, (SqlParameter[]) null );
}
/// <summary>
/// 执行指定数据库连接对象的命令
/// </summary>
/// <remarks>
/// 示例:
/// int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="commandType"> 命令类型(存储过程,命令文本或其它.) </param>
/// <param name="commandText"> T存储过程名称或T-SQL语句 </param>
/// <param name="commandParameters"> SqlParamter参数数组 </param>
/// <returns> 返回影响的行数 </returns>
public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
// 创建SqlCommand命令,并进行预处理
SqlCommand cmd = new SqlCommand();
bool mustCloseConnection = false ;
PrepareCommand(cmd, connection, (SqlTransaction) null , commandType, commandText, commandParameters, out mustCloseConnection);
// Finally, execute the command
int retval = cmd.ExecuteNonQuery();
// 清除参数,以便再次使用.
cmd.Parameters.Clear();
if (mustCloseConnection)
connection.Close();
return retval;
}
/// <summary>
/// 执行指定数据库连接对象的命令,将对象数组的值赋给存储过程参数.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值
/// 示例:
/// int result = ExecuteNonQuery(conn, "PublishOrders", 24, 36);
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="spName"> 存储过程名 </param>
/// <param name="parameterValues"> 分配给存储过程输入参数的对象数组 </param>
/// <returns> 返回影响的行数 </returns>
public static int ExecuteNonQuery(SqlConnection connection, string spName, params object [] parameterValues)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果有参数值
if ((parameterValues != null ) && (parameterValues.Length > 0 ))
{
// 从缓存中加载存储过程参数
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
// 给存储过程分配参数值
AssignParameterValues(commandParameters, parameterValues);
return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行带事务的SqlCommand.
/// </summary>
/// <remarks>
/// 示例.:
/// int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders");
/// </remarks>
/// <param name="transaction"> 一个有效的数据库连接对象 </param>
/// <param name="commandType"> 命令类型(存储过程,命令文本或其它.) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <returns> 返回影响的行数/returns>
public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText)
{
return ExecuteNonQuery(transaction, commandType, commandText, (SqlParameter[]) null );
}
/// <summary>
/// 执行带事务的SqlCommand(指定参数).
/// </summary>
/// <remarks>
/// 示例:
/// int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="transaction"> 一个有效的数据库连接对象 </param>
/// <param name="commandType"> 命令类型(存储过程,命令文本或其它.) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <param name="commandParameters"> SqlParamter参数数组 </param>
/// <returns> 返回影响的行数 </returns>
public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (transaction == null ) throw new ArgumentNullException( " transaction " );
if (transaction != null && transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
// 预处理
SqlCommand cmd = new SqlCommand();
bool mustCloseConnection = false ;
PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);
// 执行
int retval = cmd.ExecuteNonQuery();
// 清除参数集,以便再次使用.
cmd.Parameters.Clear();
return retval;
}
/// <summary>
/// 执行带事务的SqlCommand(指定参数值).
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值
/// 示例:
/// int result = ExecuteNonQuery(conn, trans, "PublishOrders", 24, 36);
/// </remarks>
/// <param name="transaction"> 一个有效的数据库连接对象 </param>
/// <param name="spName"> 存储过程名 </param>
/// <param name="parameterValues"> 分配给存储过程输入参数的对象数组 </param>
/// <returns> 返回受影响的行数 </returns>
public static int ExecuteNonQuery(SqlTransaction transaction, string spName, params object [] parameterValues)
{
if (transaction == null ) throw new ArgumentNullException( " transaction " );
if (transaction != null && transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果有参数值
if ((parameterValues != null ) && (parameterValues.Length > 0 ))
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
// 给存储过程参数赋值
AssignParameterValues(commandParameters, parameterValues);
// 调用重载方法
return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
// 没有参数值
return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);
}
}
#endregion ExecuteNonQuery方法结束
#region ExecuteDataset方法
/// <summary>
/// 执行指定数据库连接字符串的命令,返回DataSet.
/// </summary>
/// <remarks>
/// 示例:
/// DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders");
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <returns> 返回一个包含结果集的DataSet </returns>
public static DataSet ExecuteDataset( string connectionString, CommandType commandType, string commandText)
{
return ExecuteDataset(connectionString, commandType, commandText, (SqlParameter[]) null );
}
/// <summary>
/// 执行指定数据库连接字符串的命令,返回DataSet.
/// </summary>
/// <remarks>
/// 示例:
/// DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <param name="commandParameters"> SqlParamters参数数组 </param>
/// <returns> 返回一个包含结果集的DataSet </returns>
public static DataSet ExecuteDataset( string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
// 创建并打开数据库连接对象,操作完成释放对象.
using (SqlConnection connection = new SqlConnection(connectionString))
{
connection.Open();
// 调用指定数据库连接字符串重载方法.
return ExecuteDataset(connection, commandType, commandText, commandParameters);
}
}
/// <summary>
/// 执行指定数据库连接字符串的命令,直接提供参数值,返回DataSet.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值.
/// 示例:
/// DataSet ds = ExecuteDataset(connString, "GetOrders", 24, 36);
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="spName"> 存储过程名 </param>
/// <param name="parameterValues"> 分配给存储过程输入参数的对象数组 </param>
/// <returns> 返回一个包含结果集的DataSet </returns>
public static DataSet ExecuteDataset( string connectionString, string spName, params object [] parameterValues)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
if ((parameterValues != null ) && (parameterValues.Length > 0 ))
{
// 从缓存中检索存储过程参数
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
// 给存储过程参数分配值
AssignParameterValues(commandParameters, parameterValues);
return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行指定数据库连接对象的命令,返回DataSet.
/// </summary>
/// <remarks>
/// 示例:
/// DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders");
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名或T-SQL语句 </param>
/// <returns> 返回一个包含结果集的DataSet </returns>
public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText)
{
return ExecuteDataset(connection, commandType, commandText, (SqlParameter[]) null );
}
/// <summary>
/// 执行指定数据库连接对象的命令,指定存储过程参数,返回DataSet.
/// </summary>
/// <remarks>
/// 示例:
/// DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名或T-SQL语句 </param>
/// <param name="commandParameters"> SqlParamter参数数组 </param>
/// <returns> 返回一个包含结果集的DataSet </returns>
public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
// 预处理
SqlCommand cmd = new SqlCommand();
bool mustCloseConnection = false ;
PrepareCommand(cmd, connection, (SqlTransaction) null , commandType, commandText, commandParameters, out mustCloseConnection);
// 创建SqlDataAdapter和DataSet.
using (SqlDataAdapter da = new SqlDataAdapter(cmd))
{
DataSet ds = new DataSet();
// 填充DataSet.
da.Fill(ds);
cmd.Parameters.Clear();
if (mustCloseConnection)
connection.Close();
return ds;
}
}
/// <summary>
/// 执行指定数据库连接对象的命令,指定参数值,返回DataSet.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输入参数和返回值.
/// 示例.:
/// DataSet ds = ExecuteDataset(conn, "GetOrders", 24, 36);
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="spName"> 存储过程名 </param>
/// <param name="parameterValues"> 分配给存储过程输入参数的对象数组 </param>
/// <returns> 返回一个包含结果集的DataSet </returns>
public static DataSet ExecuteDataset(SqlConnection connection, string spName, params object [] parameterValues)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
if ((parameterValues != null ) && (parameterValues.Length > 0 ))
{
// 比缓存中加载存储过程参数
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
// 给存储过程参数分配值
AssignParameterValues(commandParameters, parameterValues);
return ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return ExecuteDataset(connection, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行指定事务的命令,返回DataSet.
/// </summary>
/// <remarks>
/// 示例:
/// DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders");
/// </remarks>
/// <param name="transaction"> 事务 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名或T-SQL语句 </param>
/// <returns> 返回一个包含结果集的DataSet </returns>
public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText)
{
return ExecuteDataset(transaction, commandType, commandText, (SqlParameter[]) null );
}
/// <summary>
/// 执行指定事务的命令,指定参数,返回DataSet.
/// </summary>
/// <remarks>
/// 示例:
/// DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="transaction"> 事务 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名或T-SQL语句 </param>
/// <param name="commandParameters"> SqlParamter参数数组 </param>
/// <returns> 返回一个包含结果集的DataSet </returns>
public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (transaction == null ) throw new ArgumentNullException( " transaction " );
if (transaction != null && transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
// 预处理
SqlCommand cmd = new SqlCommand();
bool mustCloseConnection = false ;
PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);
// 创建 DataAdapter & DataSet
using (SqlDataAdapter da = new SqlDataAdapter(cmd))
{
DataSet ds = new DataSet();
da.Fill(ds);
cmd.Parameters.Clear();
return ds;
}
}
/// <summary>
/// 执行指定事务的命令,指定参数值,返回DataSet.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输入参数和返回值.
/// 示例.:
/// DataSet ds = ExecuteDataset(trans, "GetOrders", 24, 36);
/// </remarks>
/// <param name="transaction"> 事务 </param>
/// <param name="spName"> 存储过程名 </param>
/// <param name="parameterValues"> 分配给存储过程输入参数的对象数组 </param>
/// <returns> 返回一个包含结果集的DataSet </returns>
public static DataSet ExecuteDataset(SqlTransaction transaction, string spName, params object [] parameterValues)
{
if (transaction == null ) throw new ArgumentNullException( " transaction " );
if (transaction != null && transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
if ((parameterValues != null ) && (parameterValues.Length > 0 ))
{
// 从缓存中加载存储过程参数
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
// 给存储过程参数分配值
AssignParameterValues(commandParameters, parameterValues);
return ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return ExecuteDataset(transaction, CommandType.StoredProcedure, spName);
}
}
#endregion ExecuteDataset数据集命令结束
#region ExecuteReader 数据阅读器
/// <summary>
/// 枚举,标识数据库连接是由SqlHelper提供还是由调用者提供
/// </summary>
private enum SqlConnectionOwnership
{
/// <summary> 由SqlHelper提供连接 </summary>
Internal,
/// <summary> 由调用者提供连接 </summary>
External
}
/// <summary>
/// 执行指定数据库连接对象的数据阅读器.
/// </summary>
/// <remarks>
/// 如果是SqlHelper打开连接,当连接关闭DataReader也将关闭.
/// 如果是调用都打开连接,DataReader由调用都管理.
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="transaction"> 一个有效的事务,或者为 'null' </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名或T-SQL语句 </param>
/// <param name="commandParameters"> SqlParameters参数数组,如果没有参数则为'null' </param>
/// <param name="connectionOwnership"> 标识数据库连接对象是由调用者提供还是由SqlHelper提供 </param>
/// <returns> 返回包含结果集的SqlDataReader </returns>
private static SqlDataReader ExecuteReader(SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, SqlConnectionOwnership connectionOwnership)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
bool mustCloseConnection = false ;
// 创建命令
SqlCommand cmd = new SqlCommand();
try
{
PrepareCommand(cmd, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);
// 创建数据阅读器
SqlDataReader dataReader;
if (connectionOwnership == SqlConnectionOwnership.External)
{
dataReader = cmd.ExecuteReader();
}
else
{
dataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
}
// 清除参数,以便再次使用..
// HACK: There is a problem here, the output parameter values are fletched
// when the reader is closed, so if the parameters are detached from the command
// then the SqlReader can磘 set its values.
// When this happen, the parameters can磘 be used again in other command.
bool canClear = true ;
foreach (SqlParameter commandParameter in cmd.Parameters)
{
if (commandParameter.Direction != ParameterDirection.Input)
canClear = false ;
}
if (canClear)
{
cmd.Parameters.Clear();
}
return dataReader;
}
catch
{
if (mustCloseConnection)
connection.Close();
throw ;
}
}
/// <summary>
/// 执行指定数据库连接字符串的数据阅读器.
/// </summary>
/// <remarks>
/// 示例:
/// SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders");
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名或T-SQL语句 </param>
/// <returns> 返回包含结果集的SqlDataReader </returns>
public static SqlDataReader ExecuteReader( string connectionString, CommandType commandType, string commandText)
{
return ExecuteReader(connectionString, commandType, commandText, (SqlParameter[]) null );
}
/// <summary>
/// 执行指定数据库连接字符串的数据阅读器,指定参数.
/// </summary>
/// <remarks>
/// 示例:
/// SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名或T-SQL语句 </param>
/// <param name="commandParameters"> SqlParamter参数数组(new SqlParameter("@prodid", 24)) </param>
/// <returns> 返回包含结果集的SqlDataReader </returns>
public static SqlDataReader ExecuteReader( string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
SqlConnection connection = null ;
try
{
connection = new SqlConnection(connectionString);
connection.Open();
return ExecuteReader(connection, null , commandType, commandText, commandParameters, SqlConnectionOwnership.Internal);
}
catch
{
// If we fail to return the SqlDatReader, we need to close the connection ourselves
if (connection != null ) connection.Close();
throw ;
}
}
/// <summary>
/// 执行指定数据库连接字符串的数据阅读器,指定参数值.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值参数.
/// 示例:
/// SqlDataReader dr = ExecuteReader(connString, "GetOrders", 24, 36);
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="spName"> 存储过程名 </param>
/// <param name="parameterValues"> 分配给存储过程输入参数的对象数组 </param>
/// <returns> 返回包含结果集的SqlDataReader </returns>
public static SqlDataReader ExecuteReader( string connectionString, string spName, params object [] parameterValues)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
if ((parameterValues != null ) && (parameterValues.Length > 0 ))
{
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
AssignParameterValues(commandParameters, parameterValues);
return ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return ExecuteReader(connectionString, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行指定数据库连接对象的数据阅读器.
/// </summary>
/// <remarks>
/// 示例:
/// SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders");
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名或T-SQL语句 </param>
/// <returns> 返回包含结果集的SqlDataReader </returns>
public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText)
{
return ExecuteReader(connection, commandType, commandText, (SqlParameter[]) null );
}
/// <summary>
/// [调用者方式]执行指定数据库连接对象的数据阅读器,指定参数.
/// </summary>
/// <remarks>
/// 示例:
/// SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandParameters"> SqlParamter参数数组 </param>
/// <returns> 返回包含结果集的SqlDataReader </returns>
public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
return ExecuteReader(connection, (SqlTransaction) null , commandType, commandText, commandParameters, SqlConnectionOwnership.External);
}
/// <summary>
/// [调用者方式]执行指定数据库连接对象的数据阅读器,指定参数值.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值参数.
/// 示例:
/// SqlDataReader dr = ExecuteReader(conn, "GetOrders", 24, 36);
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="spName"> T存储过程名 </param>
/// <param name="parameterValues"> 分配给存储过程输入参数的对象数组 </param>
/// <returns> 返回包含结果集的SqlDataReader </returns>
public static SqlDataReader ExecuteReader(SqlConnection connection, string spName, params object [] parameterValues)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
if ((parameterValues != null ) && (parameterValues.Length > 0 ))
{
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
AssignParameterValues(commandParameters, parameterValues);
return ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return ExecuteReader(connection, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// [调用者方式]执行指定数据库事务的数据阅读器,指定参数值.
/// </summary>
/// <remarks>
/// 示例:
/// SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders");
/// </remarks>
/// <param name="transaction"> 一个有效的连接事务 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <returns> 返回包含结果集的SqlDataReader </returns>
public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText)
{
return ExecuteReader(transaction, commandType, commandText, (SqlParameter[]) null );
}
/// <summary>
/// [调用者方式]执行指定数据库事务的数据阅读器,指定参数.
/// </summary>
/// <remarks>
/// 示例:
/// SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="transaction"> 一个有效的连接事务 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <param name="commandParameters"> 分配给命令的SqlParamter参数数组 </param>
/// <returns> 返回包含结果集的SqlDataReader </returns>
public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (transaction == null ) throw new ArgumentNullException( " transaction " );
if (transaction != null && transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
return ExecuteReader(transaction.Connection, transaction, commandType, commandText, commandParameters, SqlConnectionOwnership.External);
}
/// <summary>
/// [调用者方式]执行指定数据库事务的数据阅读器,指定参数值.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值参数.
///
/// 示例:
/// SqlDataReader dr = ExecuteReader(trans, "GetOrders", 24, 36);
/// </remarks>
/// <param name="transaction"> 一个有效的连接事务 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="parameterValues"> 分配给存储过程输入参数的对象数组 </param>
/// <returns> 返回包含结果集的SqlDataReader </returns>
public static SqlDataReader ExecuteReader(SqlTransaction transaction, string spName, params object [] parameterValues)
{
if (transaction == null ) throw new ArgumentNullException( " transaction " );
if (transaction != null && transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果有参数值
if ((parameterValues != null ) && (parameterValues.Length > 0 ))
{
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
AssignParameterValues(commandParameters, parameterValues);
return ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
// 没有参数值
return ExecuteReader(transaction, CommandType.StoredProcedure, spName);
}
}
#endregion ExecuteReader数据阅读器
#region ExecuteScalar 返回结果集中的第一行第一列
/// <summary>
/// 执行指定数据库连接字符串的命令,返回结果集中的第一行第一列.
/// </summary>
/// <remarks>
/// 示例:
/// int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount");
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <returns> 返回结果集中的第一行第一列 </returns>
public static object ExecuteScalar( string connectionString, CommandType commandType, string commandText)
{
// 执行参数为空的方法
return ExecuteScalar(connectionString, commandType, commandText, (SqlParameter[]) null );
}
/// <summary>
/// 执行指定数据库连接字符串的命令,指定参数,返回结果集中的第一行第一列.
/// </summary>
/// <remarks>
/// 示例:
/// int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <param name="commandParameters"> 分配给命令的SqlParamter参数数组 </param>
/// <returns> 返回结果集中的第一行第一列 </returns>
public static object ExecuteScalar( string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
// 创建并打开数据库连接对象,操作完成释放对象.
using (SqlConnection connection = new SqlConnection(connectionString))
{
connection.Open();
// 调用指定数据库连接字符串重载方法.
return ExecuteScalar(connection, commandType, commandText, commandParameters);
}
}
/// <summary>
/// 执行指定数据库连接字符串的命令,指定参数值,返回结果集中的第一行第一列.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值参数.
///
/// 示例:
/// int orderCount = (int)ExecuteScalar(connString, "GetOrderCount", 24, 36);
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="parameterValues"> 分配给存储过程输入参数的对象数组 </param>
/// <returns> 返回结果集中的第一行第一列 </returns>
public static object ExecuteScalar( string connectionString, string spName, params object [] parameterValues)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果有参数值
if ((parameterValues != null ) && (parameterValues.Length > 0 ))
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
// 给存储过程参数赋值
AssignParameterValues(commandParameters, parameterValues);
// 调用重载方法
return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
// 没有参数值
return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行指定数据库连接对象的命令,返回结果集中的第一行第一列.
/// </summary>
/// <remarks>
/// 示例:
/// int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount");
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <returns> 返回结果集中的第一行第一列 </returns>
public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText)
{
// 执行参数为空的方法
return ExecuteScalar(connection, commandType, commandText, (SqlParameter[]) null );
}
/// <summary>
/// 执行指定数据库连接对象的命令,指定参数,返回结果集中的第一行第一列.
/// </summary>
/// <remarks>
/// 示例:
/// int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <param name="commandParameters"> 分配给命令的SqlParamter参数数组 </param>
/// <returns> 返回结果集中的第一行第一列 </returns>
public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
// 创建SqlCommand命令,并进行预处理
SqlCommand cmd = new SqlCommand();
bool mustCloseConnection = false ;
PrepareCommand(cmd, connection, (SqlTransaction) null , commandType, commandText, commandParameters, out mustCloseConnection);
// 执行SqlCommand命令,并返回结果.
object retval = cmd.ExecuteScalar();
// 清除参数,以便再次使用.
cmd.Parameters.Clear();
if (mustCloseConnection)
connection.Close();
return retval;
}
/// <summary>
/// 执行指定数据库连接对象的命令,指定参数值,返回结果集中的第一行第一列.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值参数.
///
/// 示例:
/// int orderCount = (int)ExecuteScalar(conn, "GetOrderCount", 24, 36);
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="parameterValues"> 分配给存储过程输入参数的对象数组 </param>
/// <returns> 返回结果集中的第一行第一列 </returns>
public static object ExecuteScalar(SqlConnection connection, string spName, params object [] parameterValues)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果有参数值
if ((parameterValues != null ) && (parameterValues.Length > 0 ))
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
// 给存储过程参数赋值
AssignParameterValues(commandParameters, parameterValues);
// 调用重载方法
return ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
// 没有参数值
return ExecuteScalar(connection, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行指定数据库事务的命令,返回结果集中的第一行第一列.
/// </summary>
/// <remarks>
/// 示例:
/// int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount");
/// </remarks>
/// <param name="transaction"> 一个有效的连接事务 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <returns> 返回结果集中的第一行第一列 </returns>
public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText)
{
// 执行参数为空的方法
return ExecuteScalar(transaction, commandType, commandText, (SqlParameter[]) null );
}
/// <summary>
/// 执行指定数据库事务的命令,指定参数,返回结果集中的第一行第一列.
/// </summary>
/// <remarks>
/// 示例:
/// int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="transaction"> 一个有效的连接事务 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <param name="commandParameters"> 分配给命令的SqlParamter参数数组 </param>
/// <returns> 返回结果集中的第一行第一列 </returns>
public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (transaction == null ) throw new ArgumentNullException( " transaction " );
if (transaction != null && transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
// 创建SqlCommand命令,并进行预处理
SqlCommand cmd = new SqlCommand();
bool mustCloseConnection = false ;
PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);
// 执行SqlCommand命令,并返回结果.
object retval = cmd.ExecuteScalar();
// 清除参数,以便再次使用.
cmd.Parameters.Clear();
return retval;
}
/// <summary>
/// 执行指定数据库事务的命令,指定参数值,返回结果集中的第一行第一列.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值参数.
///
/// 示例:
/// int orderCount = (int)ExecuteScalar(trans, "GetOrderCount", 24, 36);
/// </remarks>
/// <param name="transaction"> 一个有效的连接事务 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="parameterValues"> 分配给存储过程输入参数的对象数组 </param>
/// <returns> 返回结果集中的第一行第一列 </returns>
public static object ExecuteScalar(SqlTransaction transaction, string spName, params object [] parameterValues)
{
if (transaction == null ) throw new ArgumentNullException( " transaction " );
if (transaction != null && transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果有参数值
if ((parameterValues != null ) && (parameterValues.Length > 0 ))
{
// PPull the parameters for this stored procedure from the parameter cache ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
// 给存储过程参数赋值
AssignParameterValues(commandParameters, parameterValues);
// 调用重载方法
return ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
// 没有参数值
return ExecuteScalar(transaction, CommandType.StoredProcedure, spName);
}
}
#endregion ExecuteScalar
#region ExecuteXmlReader XML阅读器
/// <summary>
/// 执行指定数据库连接对象的SqlCommand命令,并产生一个XmlReader对象做为结果集返回.
/// </summary>
/// <remarks>
/// 示例:
/// XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders");
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 using "FOR XML AUTO" </param>
/// <returns> 返回XmlReader结果集对象. </returns>
public static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText)
{
// 执行参数为空的方法
return ExecuteXmlReader(connection, commandType, commandText, (SqlParameter[]) null );
}
/// <summary>
/// 执行指定数据库连接对象的SqlCommand命令,并产生一个XmlReader对象做为结果集返回,指定参数.
/// </summary>
/// <remarks>
/// 示例:
/// XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 using "FOR XML AUTO" </param>
/// <param name="commandParameters"> 分配给命令的SqlParamter参数数组 </param>
/// <returns> 返回XmlReader结果集对象. </returns>
public static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
bool mustCloseConnection = false ;
// 创建SqlCommand命令,并进行预处理
SqlCommand cmd = new SqlCommand();
try
{
PrepareCommand(cmd, connection, (SqlTransaction) null , commandType, commandText, commandParameters, out mustCloseConnection);
// 执行命令
XmlReader retval = cmd.ExecuteXmlReader();
// 清除参数,以便再次使用.
cmd.Parameters.Clear();
return retval;
}
catch
{
if (mustCloseConnection)
connection.Close();
throw ;
}
}
/// <summary>
/// 执行指定数据库连接对象的SqlCommand命令,并产生一个XmlReader对象做为结果集返回,指定参数值.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值参数.
///
/// 示例:
/// XmlReader r = ExecuteXmlReader(conn, "GetOrders", 24, 36);
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="spName"> 存储过程名称 using "FOR XML AUTO" </param>
/// <param name="parameterValues"> 分配给存储过程输入参数的对象数组 </param>
/// <returns> 返回XmlReader结果集对象. </returns>
public static XmlReader ExecuteXmlReader(SqlConnection connection, string spName, params object [] parameterValues)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果有参数值
if ((parameterValues != null ) && (parameterValues.Length > 0 ))
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
// 给存储过程参数赋值
AssignParameterValues(commandParameters, parameterValues);
// 调用重载方法
return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
// 没有参数值
return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行指定数据库事务的SqlCommand命令,并产生一个XmlReader对象做为结果集返回.
/// </summary>
/// <remarks>
/// 示例:
/// XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders");
/// </remarks>
/// <param name="transaction"> 一个有效的连接事务 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 using "FOR XML AUTO" </param>
/// <returns> 返回XmlReader结果集对象. </returns>
public static XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText)
{
// 执行参数为空的方法
return ExecuteXmlReader(transaction, commandType, commandText, (SqlParameter[]) null );
}
/// <summary>
/// 执行指定数据库事务的SqlCommand命令,并产生一个XmlReader对象做为结果集返回,指定参数.
/// </summary>
/// <remarks>
/// 示例:
/// XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="transaction"> 一个有效的连接事务 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 using "FOR XML AUTO" </param>
/// <param name="commandParameters"> 分配给命令的SqlParamter参数数组 </param>
/// <returns> 返回XmlReader结果集对象. </returns>
public static XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (transaction == null ) throw new ArgumentNullException( " transaction " );
if (transaction != null && transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
// 创建SqlCommand命令,并进行预处理
SqlCommand cmd = new SqlCommand();
bool mustCloseConnection = false ;
PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);
// 执行命令
XmlReader retval = cmd.ExecuteXmlReader();
// 清除参数,以便再次使用.
cmd.Parameters.Clear();
return retval;
}
/// <summary>
/// 执行指定数据库事务的SqlCommand命令,并产生一个XmlReader对象做为结果集返回,指定参数值.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值参数.
///
/// 示例:
/// XmlReader r = ExecuteXmlReader(trans, "GetOrders", 24, 36);
/// </remarks>
/// <param name="transaction"> 一个有效的连接事务 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="parameterValues"> 分配给存储过程输入参数的对象数组 </param>
/// <returns> 返回一个包含结果集的DataSet. </returns>
public static XmlReader ExecuteXmlReader(SqlTransaction transaction, string spName, params object [] parameterValues)
{
if (transaction == null ) throw new ArgumentNullException( " transaction " );
if (transaction != null && transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果有参数值
if ((parameterValues != null ) && (parameterValues.Length > 0 ))
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
// 给存储过程参数赋值
AssignParameterValues(commandParameters, parameterValues);
// 调用重载方法
return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
// 没有参数值
return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName);
}
}
#endregion ExecuteXmlReader 阅读器结束
#region FillDataset 填充数据集
/// <summary>
/// 执行指定数据库连接字符串的命令,映射数据表并填充数据集.
/// </summary>
/// <remarks>
/// 示例:
/// FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <param name="dataSet"> 要填充结果集的DataSet实例 </param>
/// <param name="tableNames"> 表映射的数据表数组
/// 用户定义的表名 (可有是实际的表名.) </param>
public static void FillDataset( string connectionString, CommandType commandType, string commandText, DataSet dataSet, string [] tableNames)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
if (dataSet == null ) throw new ArgumentNullException( " dataSet " );
// 创建并打开数据库连接对象,操作完成释放对象.
using (SqlConnection connection = new SqlConnection(connectionString))
{
connection.Open();
// 调用指定数据库连接字符串重载方法.
FillDataset(connection, commandType, commandText, dataSet, tableNames);
}
}
/// <summary>
/// 执行指定数据库连接字符串的命令,映射数据表并填充数据集.指定命令参数.
/// </summary>
/// <remarks>
/// 示例:
/// FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <param name="commandParameters"> 分配给命令的SqlParamter参数数组 </param>
/// <param name="dataSet"> 要填充结果集的DataSet实例 </param>
/// <param name="tableNames"> 表映射的数据表数组
/// 用户定义的表名 (可有是实际的表名.)
/// </param>
public static void FillDataset( string connectionString, CommandType commandType,
string commandText, DataSet dataSet, string [] tableNames,
params SqlParameter[] commandParameters)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
if (dataSet == null ) throw new ArgumentNullException( " dataSet " );
// 创建并打开数据库连接对象,操作完成释放对象.
using (SqlConnection connection = new SqlConnection(connectionString))
{
connection.Open();
// 调用指定数据库连接字符串重载方法.
FillDataset(connection, commandType, commandText, dataSet, tableNames, commandParameters);
}
}
/// <summary>
/// 执行指定数据库连接字符串的命令,映射数据表并填充数据集,指定存储过程参数值.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值参数.
///
/// 示例:
/// FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, 24);
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataSet"> 要填充结果集的DataSet实例 </param>
/// <param name="tableNames"> 表映射的数据表数组
/// 用户定义的表名 (可有是实际的表名.)
/// </param>
/// <param name="parameterValues"> 分配给存储过程输入参数的对象数组 </param>
public static void FillDataset( string connectionString, string spName,
DataSet dataSet, string [] tableNames,
params object [] parameterValues)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
if (dataSet == null ) throw new ArgumentNullException( " dataSet " );
// 创建并打开数据库连接对象,操作完成释放对象.
using (SqlConnection connection = new SqlConnection(connectionString))
{
connection.Open();
// 调用指定数据库连接字符串重载方法.
FillDataset(connection, spName, dataSet, tableNames, parameterValues);
}
}
/// <summary>
/// 执行指定数据库连接对象的命令,映射数据表并填充数据集.
/// </summary>
/// <remarks>
/// 示例:
/// FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <param name="dataSet"> 要填充结果集的DataSet实例 </param>
/// <param name="tableNames"> 表映射的数据表数组
/// 用户定义的表名 (可有是实际的表名.)
/// </param>
public static void FillDataset(SqlConnection connection, CommandType commandType,
string commandText, DataSet dataSet, string [] tableNames)
{
FillDataset(connection, commandType, commandText, dataSet, tableNames, null );
}
/// <summary>
/// 执行指定数据库连接对象的命令,映射数据表并填充数据集,指定参数.
/// </summary>
/// <remarks>
/// 示例:
/// FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <param name="dataSet"> 要填充结果集的DataSet实例 </param>
/// <param name="tableNames"> 表映射的数据表数组
/// 用户定义的表名 (可有是实际的表名.)
/// </param>
/// <param name="commandParameters"> 分配给命令的SqlParamter参数数组 </param>
public static void FillDataset(SqlConnection connection, CommandType commandType,
string commandText, DataSet dataSet, string [] tableNames,
params SqlParameter[] commandParameters)
{
FillDataset(connection, null , commandType, commandText, dataSet, tableNames, commandParameters);
}
/// <summary>
/// 执行指定数据库连接对象的命令,映射数据表并填充数据集,指定存储过程参数值.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值参数.
///
/// 示例:
/// FillDataset(conn, "GetOrders", ds, new string[] {"orders"}, 24, 36);
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataSet"> 要填充结果集的DataSet实例 </param>
/// <param name="tableNames"> 表映射的数据表数组
/// 用户定义的表名 (可有是实际的表名.)
/// </param>
/// <param name="parameterValues"> 分配给存储过程输入参数的对象数组 </param>
public static void FillDataset(SqlConnection connection, string spName,
DataSet dataSet, string [] tableNames,
params object [] parameterValues)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
if (dataSet == null ) throw new ArgumentNullException( " dataSet " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果有参数值
if ((parameterValues != null ) && (parameterValues.Length > 0 ))
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
// 给存储过程参数赋值
AssignParameterValues(commandParameters, parameterValues);
// 调用重载方法
FillDataset(connection, CommandType.StoredProcedure, spName, dataSet, tableNames, commandParameters);
}
else
{
// 没有参数值
FillDataset(connection, CommandType.StoredProcedure, spName, dataSet, tableNames);
}
}
/// <summary>
/// 执行指定数据库事务的命令,映射数据表并填充数据集.
/// </summary>
/// <remarks>
/// 示例:
/// FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
/// </remarks>
/// <param name="transaction"> 一个有效的连接事务 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <param name="dataSet"> 要填充结果集的DataSet实例 </param>
/// <param name="tableNames"> 表映射的数据表数组
/// 用户定义的表名 (可有是实际的表名.)
/// </param>
public static void FillDataset(SqlTransaction transaction, CommandType commandType,
string commandText,
DataSet dataSet, string [] tableNames)
{
FillDataset(transaction, commandType, commandText, dataSet, tableNames, null );
}
/// <summary>
/// 执行指定数据库事务的命令,映射数据表并填充数据集,指定参数.
/// </summary>
/// <remarks>
/// 示例:
/// FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="transaction"> 一个有效的连接事务 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <param name="dataSet"> 要填充结果集的DataSet实例 </param>
/// <param name="tableNames"> 表映射的数据表数组
/// 用户定义的表名 (可有是实际的表名.)
/// </param>
/// <param name="commandParameters"> 分配给命令的SqlParamter参数数组 </param>
public static void FillDataset(SqlTransaction transaction, CommandType commandType,
string commandText, DataSet dataSet, string [] tableNames,
params SqlParameter[] commandParameters)
{
FillDataset(transaction.Connection, transaction, commandType, commandText, dataSet, tableNames, commandParameters);
}
/// <summary>
/// 执行指定数据库事务的命令,映射数据表并填充数据集,指定存储过程参数值.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值参数.
///
/// 示例:
/// FillDataset(trans, "GetOrders", ds, new string[]{"orders"}, 24, 36);
/// </remarks>
/// <param name="transaction"> 一个有效的连接事务 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataSet"> 要填充结果集的DataSet实例 </param>
/// <param name="tableNames"> 表映射的数据表数组
/// 用户定义的表名 (可有是实际的表名.)
/// </param>
/// <param name="parameterValues"> 分配给存储过程输入参数的对象数组 </param>
public static void FillDataset(SqlTransaction transaction, string spName,
DataSet dataSet, string [] tableNames,
params object [] parameterValues)
{
if (transaction == null ) throw new ArgumentNullException( " transaction " );
if (transaction != null && transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
if (dataSet == null ) throw new ArgumentNullException( " dataSet " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果有参数值
if ((parameterValues != null ) && (parameterValues.Length > 0 ))
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
// 给存储过程参数赋值
AssignParameterValues(commandParameters, parameterValues);
// 调用重载方法
FillDataset(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames, commandParameters);
}
else
{
// 没有参数值
FillDataset(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames);
}
}
/// <summary>
/// [私有方法][内部调用]执行指定数据库连接对象/事务的命令,映射数据表并填充数据集,DataSet/TableNames/SqlParameters.
/// </summary>
/// <remarks>
/// 示例:
/// FillDataset(conn, trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="transaction"> 一个有效的连接事务 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <param name="dataSet"> 要填充结果集的DataSet实例 </param>
/// <param name="tableNames"> 表映射的数据表数组
/// 用户定义的表名 (可有是实际的表名.)
/// </param>
/// <param name="commandParameters"> 分配给命令的SqlParamter参数数组 </param>
private static void FillDataset(SqlConnection connection, SqlTransaction transaction, CommandType commandType,
string commandText, DataSet dataSet, string [] tableNames,
params SqlParameter[] commandParameters)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
if (dataSet == null ) throw new ArgumentNullException( " dataSet " );
// 创建SqlCommand命令,并进行预处理
SqlCommand command = new SqlCommand();
bool mustCloseConnection = false ;
PrepareCommand(command, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);
// 执行命令
using (SqlDataAdapter dataAdapter = new SqlDataAdapter(command))
{
// 追加表映射
if (tableNames != null && tableNames.Length > 0 )
{
string tableName = " Table " ;
for ( int index = 0 ; index < tableNames.Length; index ++ )
{
if (tableNames[index] == null || tableNames[index].Length == 0 ) throw new ArgumentException( " The tableNames parameter must contain a list of tables, a value was provided as null or empty string. " , " tableNames " );
dataAdapter.TableMappings.Add(tableName, tableNames[index]);
tableName += (index + 1 ).ToString();
}
}
// 填充数据集使用默认表名称
dataAdapter.Fill(dataSet);
// 清除参数,以便再次使用.
command.Parameters.Clear();
}
if (mustCloseConnection)
connection.Close();
}
#endregion
#region UpdateDataset 更新数据集
/// <summary>
/// 执行数据集更新到数据库,指定inserted, updated, or deleted命令.
/// </summary>
/// <remarks>
/// 示例:
/// UpdateDataset(conn, insertCommand, deleteCommand, updateCommand, dataSet, "Order");
/// </remarks>
/// <param name="insertCommand"> [追加记录]一个有效的T-SQL语句或存储过程 </param>
/// <param name="deleteCommand"> [删除记录]一个有效的T-SQL语句或存储过程 </param>
/// <param name="updateCommand"> [更新记录]一个有效的T-SQL语句或存储过程 </param>
/// <param name="dataSet"> 要更新到数据库的DataSet </param>
/// <param name="tableName"> 要更新到数据库的DataTable </param>
public static void UpdateDataset(SqlCommand insertCommand, SqlCommand deleteCommand, SqlCommand updateCommand, DataSet dataSet, string tableName)
{
if (insertCommand == null ) throw new ArgumentNullException( " insertCommand " );
if (deleteCommand == null ) throw new ArgumentNullException( " deleteCommand " );
if (updateCommand == null ) throw new ArgumentNullException( " updateCommand " );
if (tableName == null || tableName.Length == 0 ) throw new ArgumentNullException( " tableName " );
// 创建SqlDataAdapter,当操作完成后释放.
using (SqlDataAdapter dataAdapter = new SqlDataAdapter())
{
// 设置数据适配器命令
dataAdapter.UpdateCommand = updateCommand;
dataAdapter.InsertCommand = insertCommand;
dataAdapter.DeleteCommand = deleteCommand;
// 更新数据集改变到数据库
dataAdapter.Update(dataSet, tableName);
// 提交所有改变到数据集.
dataSet.AcceptChanges();
}
}
#endregion
#region CreateCommand 创建一条SqlCommand命令
/// <summary>
/// 创建SqlCommand命令,指定数据库连接对象,存储过程名和参数.
/// </summary>
/// <remarks>
/// 示例:
/// SqlCommand command = CreateCommand(conn, "AddCustomer", "CustomerID", "CustomerName");
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="sourceColumns"> 源表的列名称数组 </param>
/// <returns> 返回SqlCommand命令 </returns>
public static SqlCommand CreateCommand(SqlConnection connection, string spName, params string [] sourceColumns)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 创建命令
SqlCommand cmd = new SqlCommand(spName, connection);
cmd.CommandType = CommandType.StoredProcedure;
// 如果有参数值
if ((sourceColumns != null ) && (sourceColumns.Length > 0 ))
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
// 将源表的列到映射到DataSet命令中.
for ( int index = 0 ; index < sourceColumns.Length; index ++ )
commandParameters[index].SourceColumn = sourceColumns[index];
// Attach the discovered parameters to the SqlCommand object
AttachParameters(cmd, commandParameters);
}
return cmd;
}
#endregion
#region ExecuteNonQueryTypedParams 类型化参数(DataRow)
/// <summary>
/// 执行指定连接数据库连接字符串的存储过程,使用DataRow做为参数值,返回受影响的行数.
/// </summary>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataRow"> 使用DataRow作为参数值 </param>
/// <returns> 返回影响的行数 </returns>
public static int ExecuteNonQueryTypedParams(String connectionString, String spName, DataRow dataRow)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果row有值,存储过程必须初始化.
if (dataRow != null && dataRow.ItemArray.Length > 0 )
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
// 分配参数值
AssignParameterValues(commandParameters, dataRow);
return SqlHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return SqlHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行指定连接数据库连接对象的存储过程,使用DataRow做为参数值,返回受影响的行数.
/// </summary>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataRow"> 使用DataRow作为参数值 </param>
/// <returns> 返回影响的行数 </returns>
public static int ExecuteNonQueryTypedParams(SqlConnection connection, String spName, DataRow dataRow)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果row有值,存储过程必须初始化.
if (dataRow != null && dataRow.ItemArray.Length > 0 )
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
// 分配参数值
AssignParameterValues(commandParameters, dataRow);
return SqlHelper.ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return SqlHelper.ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行指定连接数据库事物的存储过程,使用DataRow做为参数值,返回受影响的行数.
/// </summary>
/// <param name="transaction"> 一个有效的连接事务 object </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataRow"> 使用DataRow作为参数值 </param>
/// <returns> 返回影响的行数 </returns>
public static int ExecuteNonQueryTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
{
if (transaction == null ) throw new ArgumentNullException( " transaction " );
if (transaction != null && transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// Sf the row has values, the store procedure parameters must be initialized
if (dataRow != null && dataRow.ItemArray.Length > 0 )
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
// 分配参数值
AssignParameterValues(commandParameters, dataRow);
return SqlHelper.ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return SqlHelper.ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);
}
}
#endregion
#region ExecuteDatasetTypedParams 类型化参数(DataRow)
/// <summary>
/// 执行指定连接数据库连接字符串的存储过程,使用DataRow做为参数值,返回DataSet.
/// </summary>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataRow"> 使用DataRow作为参数值 </param>
/// <returns> 返回一个包含结果集的DataSet. </returns>
public static DataSet ExecuteDatasetTypedParams( string connectionString, String spName, DataRow dataRow)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果row有值,存储过程必须初始化.
if (dataRow != null && dataRow.ItemArray.Length > 0 )
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
// 分配参数值
AssignParameterValues(commandParameters, dataRow);
return SqlHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return SqlHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行指定连接数据库连接对象的存储过程,使用DataRow做为参数值,返回DataSet.
/// </summary>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataRow"> 使用DataRow作为参数值 </param>
/// <returns> 返回一个包含结果集的DataSet. </returns>
///
public static DataSet ExecuteDatasetTypedParams(SqlConnection connection, String spName, DataRow dataRow)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果row有值,存储过程必须初始化.
if (dataRow != null && dataRow.ItemArray.Length > 0 )
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
// 分配参数值
AssignParameterValues(commandParameters, dataRow);
return SqlHelper.ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return SqlHelper.ExecuteDataset(connection, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行指定连接数据库事务的存储过程,使用DataRow做为参数值,返回DataSet.
/// </summary>
/// <param name="transaction"> 一个有效的连接事务 object </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataRow"> 使用DataRow作为参数值 </param>
/// <returns> 返回一个包含结果集的DataSet. </returns>
public static DataSet ExecuteDatasetTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
{
if (transaction == null ) throw new ArgumentNullException( " transaction " );
if (transaction != null && transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果row有值,存储过程必须初始化.
if (dataRow != null && dataRow.ItemArray.Length > 0 )
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
// 分配参数值
AssignParameterValues(commandParameters, dataRow);
return SqlHelper.ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return SqlHelper.ExecuteDataset(transaction, CommandType.StoredProcedure, spName);
}
}
#endregion
#region ExecuteReaderTypedParams 类型化参数(DataRow)
/// <summary>
/// 执行指定连接数据库连接字符串的存储过程,使用DataRow做为参数值,返回DataReader.
/// </summary>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataRow"> 使用DataRow作为参数值 </param>
/// <returns> 返回包含结果集的SqlDataReader </returns>
public static SqlDataReader ExecuteReaderTypedParams(String connectionString, String spName, DataRow dataRow)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果row有值,存储过程必须初始化.
if (dataRow != null && dataRow.ItemArray.Length > 0 )
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
// 分配参数值
AssignParameterValues(commandParameters, dataRow);
return SqlHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return SqlHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行指定连接数据库连接对象的存储过程,使用DataRow做为参数值,返回DataReader.
/// </summary>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataRow"> 使用DataRow作为参数值 </param>
/// <returns> 返回包含结果集的SqlDataReader </returns>
public static SqlDataReader ExecuteReaderTypedParams(SqlConnection connection, String spName, DataRow dataRow)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果row有值,存储过程必须初始化.
if (dataRow != null && dataRow.ItemArray.Length > 0 )
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
// 分配参数值
AssignParameterValues(commandParameters, dataRow);
return SqlHelper.ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return SqlHelper.ExecuteReader(connection, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行指定连接数据库事物的存储过程,使用DataRow做为参数值,返回DataReader.
/// </summary>
/// <param name="transaction"> 一个有效的连接事务 object </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataRow"> 使用DataRow作为参数值 </param>
/// <returns> 返回包含结果集的SqlDataReader </returns>
public static SqlDataReader ExecuteReaderTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
{
if (transaction == null ) throw new ArgumentNullException( " transaction " );
if (transaction != null && transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果row有值,存储过程必须初始化.
if (dataRow != null && dataRow.ItemArray.Length > 0 )
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
// 分配参数值
AssignParameterValues(commandParameters, dataRow);
return SqlHelper.ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return SqlHelper.ExecuteReader(transaction, CommandType.StoredProcedure, spName);
}
}
#endregion
#region ExecuteScalarTypedParams 类型化参数(DataRow)
/// <summary>
/// 执行指定连接数据库连接字符串的存储过程,使用DataRow做为参数值,返回结果集中的第一行第一列.
/// </summary>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataRow"> 使用DataRow作为参数值 </param>
/// <returns> 返回结果集中的第一行第一列 </returns>
public static object ExecuteScalarTypedParams(String connectionString, String spName, DataRow dataRow)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果row有值,存储过程必须初始化.
if (dataRow != null && dataRow.ItemArray.Length > 0 )
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
// 分配参数值
AssignParameterValues(commandParameters, dataRow);
return SqlHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return SqlHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行指定连接数据库连接对象的存储过程,使用DataRow做为参数值,返回结果集中的第一行第一列.
/// </summary>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataRow"> 使用DataRow作为参数值 </param>
/// <returns> 返回结果集中的第一行第一列 </returns>
public static object ExecuteScalarTypedParams(SqlConnection connection, String spName, DataRow dataRow)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果row有值,存储过程必须初始化.
if (dataRow != null && dataRow.ItemArray.Length > 0 )
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
// 分配参数值
AssignParameterValues(commandParameters, dataRow);
return SqlHelper.ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return SqlHelper.ExecuteScalar(connection, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行指定连接数据库事务的存储过程,使用DataRow做为参数值,返回结果集中的第一行第一列.
/// </summary>
/// <param name="transaction"> 一个有效的连接事务 object </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataRow"> 使用DataRow作为参数值 </param>
/// <returns> 返回结果集中的第一行第一列 </returns>
public static object ExecuteScalarTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
{
if (transaction == null ) throw new ArgumentNullException( " transaction " );
if (transaction != null && transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果row有值,存储过程必须初始化.
if (dataRow != null && dataRow.ItemArray.Length > 0 )
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
// 分配参数值
AssignParameterValues(commandParameters, dataRow);
return SqlHelper.ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return SqlHelper.ExecuteScalar(transaction, CommandType.StoredProcedure, spName);
}
}
#endregion
#region ExecuteXmlReaderTypedParams 类型化参数(DataRow)
/// <summary>
/// 执行指定连接数据库连接对象的存储过程,使用DataRow做为参数值,返回XmlReader类型的结果集.
/// </summary>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataRow"> 使用DataRow作为参数值 </param>
/// <returns> 返回XmlReader结果集对象. </returns>
public static XmlReader ExecuteXmlReaderTypedParams(SqlConnection connection, String spName, DataRow dataRow)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果row有值,存储过程必须初始化.
if (dataRow != null && dataRow.ItemArray.Length > 0 )
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
// 分配参数值
AssignParameterValues(commandParameters, dataRow);
return SqlHelper.ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return SqlHelper.ExecuteXmlReader(connection, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行指定连接数据库事务的存储过程,使用DataRow做为参数值,返回XmlReader类型的结果集.
/// </summary>
/// <param name="transaction"> 一个有效的连接事务 object </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataRow"> 使用DataRow作为参数值 </param>
/// <returns> 返回XmlReader结果集对象. </returns>
public static XmlReader ExecuteXmlReaderTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
{
if (transaction == null ) throw new ArgumentNullException( " transaction " );
if (transaction != null && transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果row有值,存储过程必须初始化.
if (dataRow != null && dataRow.ItemArray.Length > 0 )
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
// 分配参数值
AssignParameterValues(commandParameters, dataRow);
return SqlHelper.ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return SqlHelper.ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName);
}
}
#endregion
}
/// <summary>
/// SqlHelperParameterCache提供缓存存储过程参数,并能够在运行时从存储过程中探索参数.
/// </summary>
public sealed class SqlHelperParameterCache
{
#region 私有方法,字段,构造函数
// 私有构造函数,妨止类被实例化.
private SqlHelperParameterCache() { }
// 这个方法要注意
private static Hashtable paramCache = Hashtable.Synchronized( new Hashtable());
/// <summary>
/// 探索运行时的存储过程,返回SqlParameter参数数组.
/// 初始化参数值为 DBNull.Value.
/// </summary>
/// <param name="connection"> 一个有效的数据库连接 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="includeReturnValueParameter"> 是否包含返回值参数 </param>
/// <returns> 返回SqlParameter参数数组 </returns>
private static SqlParameter[] DiscoverSpParameterSet(SqlConnection connection, string spName, bool includeReturnValueParameter)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
SqlCommand cmd = new SqlCommand(spName, connection);
cmd.CommandType = CommandType.StoredProcedure;
connection.Open();
// 检索cmd指定的存储过程的参数信息,并填充到cmd的Parameters参数集中.
SqlCommandBuilder.DeriveParameters(cmd);
connection.Close();
// 如果不包含返回值参数,将参数集中的每一个参数删除.
if ( ! includeReturnValueParameter)
{
cmd.Parameters.RemoveAt( 0 );
}
// 创建参数数组
SqlParameter[] discoveredParameters = new SqlParameter[cmd.Parameters.Count];
// 将cmd的Parameters参数集复制到discoveredParameters数组.
cmd.Parameters.CopyTo(discoveredParameters, 0 );
// 初始化参数值为 DBNull.Value.
foreach (SqlParameter discoveredParameter in discoveredParameters)
{
discoveredParameter.Value = DBNull.Value;
}
return discoveredParameters;
}
/// <summary>
/// SqlParameter参数数组的深层拷贝.
/// </summary>
/// <param name="originalParameters"> 原始参数数组 </param>
/// <returns> 返回一个同样的参数数组 </returns>
private static SqlParameter[] CloneParameters(SqlParameter[] originalParameters)
{
SqlParameter[] clonedParameters = new SqlParameter[originalParameters.Length];
for ( int i = 0 , j = originalParameters.Length; i < j; i ++ )
{
clonedParameters[i] = (SqlParameter)((ICloneable)originalParameters[i]).Clone();
}
return clonedParameters;
}
#endregion 私有方法,字段,构造函数结束
#region 缓存方法
/// <summary>
/// 追加参数数组到缓存.
/// </summary>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="commandText"> 存储过程名或SQL语句 </param>
/// <param name="commandParameters"> 要缓存的参数数组 </param>
public static void CacheParameterSet( string connectionString, string commandText, params SqlParameter[] commandParameters)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
if (commandText == null || commandText.Length == 0 ) throw new ArgumentNullException( " commandText " );
string hashKey = connectionString + " : " + commandText;
paramCache[hashKey] = commandParameters;
}
/// <summary>
/// 从缓存中获取参数数组.
/// </summary>
/// <param name="connectionString"> 一个有效的数据库连接字符 </param>
/// <param name="commandText"> 存储过程名或SQL语句 </param>
/// <returns> 参数数组 </returns>
public static SqlParameter[] GetCachedParameterSet( string connectionString, string commandText)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
if (commandText == null || commandText.Length == 0 ) throw new ArgumentNullException( " commandText " );
string hashKey = connectionString + " : " + commandText;
SqlParameter[] cachedParameters = paramCache[hashKey] as SqlParameter[];
if (cachedParameters == null )
{
return null ;
}
else
{
return CloneParameters(cachedParameters);
}
}
#endregion 缓存方法结束
#region 检索指定的存储过程的参数集
/// <summary>
/// 返回指定的存储过程的参数集
/// </summary>
/// <remarks>
/// 这个方法将查询数据库,并将信息存储到缓存.
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符 </param>
/// <param name="spName"> 存储过程名 </param>
/// <returns> 返回SqlParameter参数数组 </returns>
public static SqlParameter[] GetSpParameterSet( string connectionString, string spName)
{
return GetSpParameterSet(connectionString, spName, false );
}
/// <summary>
/// 返回指定的存储过程的参数集
/// </summary>
/// <remarks>
/// 这个方法将查询数据库,并将信息存储到缓存.
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符. </param>
/// <param name="spName"> 存储过程名 </param>
/// <param name="includeReturnValueParameter"> 是否包含返回值参数 </param>
/// <returns> 返回SqlParameter参数数组 </returns>
public static SqlParameter[] GetSpParameterSet( string connectionString, string spName, bool includeReturnValueParameter)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
using (SqlConnection connection = new SqlConnection(connectionString))
{
return GetSpParameterSetInternal(connection, spName, includeReturnValueParameter);
}
}
/// <summary>
/// [内部]返回指定的存储过程的参数集(使用连接对象).
/// </summary>
/// <remarks>
/// 这个方法将查询数据库,并将信息存储到缓存.
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接字符 </param>
/// <param name="spName"> 存储过程名 </param>
/// <returns> 返回SqlParameter参数数组 </returns>
internal static SqlParameter[] GetSpParameterSet(SqlConnection connection, string spName)
{
return GetSpParameterSet(connection, spName, false );
}
/// <summary>
/// [内部]返回指定的存储过程的参数集(使用连接对象)
/// </summary>
/// <remarks>
/// 这个方法将查询数据库,并将信息存储到缓存.
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="spName"> 存储过程名 </param>
/// <param name="includeReturnValueParameter">
/// 是否包含返回值参数
/// </param>
/// <returns> 返回SqlParameter参数数组 </returns>
internal static SqlParameter[] GetSpParameterSet(SqlConnection connection, string spName, bool includeReturnValueParameter)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
using (SqlConnection clonedConnection = (SqlConnection)((ICloneable)connection).Clone())
{
return GetSpParameterSetInternal(clonedConnection, spName, includeReturnValueParameter);
}
}
/// <summary>
/// [私有]返回指定的存储过程的参数集(使用连接对象)
/// </summary>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="spName"> 存储过程名 </param>
/// <param name="includeReturnValueParameter"> 是否包含返回值参数 </param>
/// <returns> 返回SqlParameter参数数组 </returns>
private static SqlParameter[] GetSpParameterSetInternal(SqlConnection connection, string spName, bool includeReturnValueParameter)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
string hashKey = connection.ConnectionString + " : " + spName + (includeReturnValueParameter ? " :include ReturnValue Parameter " : "" );
SqlParameter[] cachedParameters;
cachedParameters = paramCache[hashKey] as SqlParameter[];
if (cachedParameters == null )
{
SqlParameter[] spParameters = DiscoverSpParameterSet(connection, spName, includeReturnValueParameter);
paramCache[hashKey] = spParameters;
cachedParameters = spParameters;
}
return CloneParameters(cachedParameters);
}
#endregion 参数集检索结束
}
using System.Data;
using System.Xml;
using System.Data.SqlClient;
using System.Collections;
/// <summary>
/// SqlServer 数据访问帮助类
/// </summary>
public sealed class SqlHelper
{
#region 私有构造函数和方法
private SqlHelper() { }
/// <summary>
/// 将SqlParameter参数数组(参数值)分配给SqlCommand命令.
/// 这个方法将给任何一个参数分配DBNull.Value;
/// 该操作将阻止默认值的使用.
/// </summary>
/// <param name="command"> 命令名 </param>
/// <param name="commandParameters"> SqlParameters数组 </param>
private static void AttachParameters(SqlCommand command, SqlParameter[] commandParameters)
{
if (command == null ) throw new ArgumentNullException( " command " );
if (commandParameters != null )
{
foreach (SqlParameter p in commandParameters)
{
if (p != null )
{
// 检查未分配值的输出参数,将其分配以DBNull.Value.
if ((p.Direction == ParameterDirection.InputOutput || p.Direction == ParameterDirection.Input) &&
(p.Value == null ))
{
p.Value = DBNull.Value;
}
command.Parameters.Add(p);
}
}
}
}
/// <summary>
/// 将DataRow类型的列值分配到SqlParameter参数数组.
/// </summary>
/// <param name="commandParameters"> 要分配值的SqlParameter参数数组 </param>
/// <param name="dataRow"> 将要分配给存储过程参数的DataRow </param>
private static void AssignParameterValues(SqlParameter[] commandParameters, DataRow dataRow)
{
if ((commandParameters == null ) || (dataRow == null ))
{
return ;
}
int i = 0 ;
// 设置参数值
foreach (SqlParameter commandParameter in commandParameters)
{
// 创建参数名称,如果不存在,只抛出一个异常.
if (commandParameter.ParameterName == null ||
commandParameter.ParameterName.Length <= 1 )
throw new Exception(
string .Format( " 请提供参数{0}一个有效的名称{1}. " , i, commandParameter.ParameterName));
// 从dataRow的表中获取为参数数组中数组名称的列的索引.
// 如果存在和参数名称相同的列,则将列值赋给当前名称的参数.
if (dataRow.Table.Columns.IndexOf(commandParameter.ParameterName.Substring( 1 )) != - 1 )
commandParameter.Value = dataRow[commandParameter.ParameterName.Substring( 1 )];
i ++ ;
}
}
/// <summary>
/// 将一个对象数组分配给SqlParameter参数数组.
/// </summary>
/// <param name="commandParameters"> 要分配值的SqlParameter参数数组 </param>
/// <param name="parameterValues"> 将要分配给存储过程参数的对象数组 </param>
private static void AssignParameterValues(SqlParameter[] commandParameters, object [] parameterValues)
{
if ((commandParameters == null ) || (parameterValues == null ))
{
return ;
}
// 确保对象数组个数与参数个数匹配,如果不匹配,抛出一个异常.
if (commandParameters.Length != parameterValues.Length)
{
throw new ArgumentException( " 参数值个数与参数不匹配. " );
}
// 给参数赋值
for ( int i = 0 , j = commandParameters.Length; i < j; i ++ )
{
// If the current array value derives from IDbDataParameter, then assign its Value property
if (parameterValues[i] is IDbDataParameter)
{
IDbDataParameter paramInstance = (IDbDataParameter)parameterValues[i];
if (paramInstance.Value == null )
{
commandParameters[i].Value = DBNull.Value;
}
else
{
commandParameters[i].Value = paramInstance.Value;
}
}
else if (parameterValues[i] == null )
{
commandParameters[i].Value = DBNull.Value;
}
else
{
commandParameters[i].Value = parameterValues[i];
}
}
}
/// <summary>
/// 预处理用户提供的命令,数据库连接/事务/命令类型/参数
/// </summary>
/// <param name="command"> 要处理的SqlCommand </param>
/// <param name="connection"> 数据库连接 </param>
/// <param name="transaction"> 一个有效的事务或者是null值 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本, 其它.) </param>
/// <param name="commandText"> 存储过程名或都T-SQL命令文本 </param>
/// <param name="commandParameters"> 和命令相关联的SqlParameter参数数组,如果没有参数为'null' </param>
/// <param name="mustCloseConnection"><c> true </c> 如果连接是打开的,则为true,其它情况下为false. </param>
private static void PrepareCommand(SqlCommand command, SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, out bool mustCloseConnection)
{
if (command == null ) throw new ArgumentNullException( " command " );
if (commandText == null || commandText.Length == 0 ) throw new ArgumentNullException( " commandText " );
// If the provided connection is not open, we will open it
if (connection.State != ConnectionState.Open)
{
mustCloseConnection = true ;
connection.Open();
}
else
{
mustCloseConnection = false ;
}
// 给命令分配一个数据库连接.
command.Connection = connection;
// 设置命令文本(存储过程名或SQL语句)
command.CommandText = commandText;
// 分配事务
if (transaction != null )
{
if (transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
command.Transaction = transaction;
}
// 设置命令类型.
command.CommandType = commandType;
// 分配命令参数
if (commandParameters != null )
{
AttachParameters(command, commandParameters);
}
return ;
}
#endregion 私有构造函数和方法结束
#region ExecuteNonQuery命令
/// <summary>
/// 执行指定连接字符串,类型的SqlCommand.
/// </summary>
/// <remarks>
/// 示例:
/// int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders");
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本, 其它.) </param>
/// <param name="commandText"> 存储过程名称或SQL语句 </param>
/// <returns> 返回命令影响的行数 </returns>
public static int ExecuteNonQuery( string connectionString, CommandType commandType, string commandText)
{
return ExecuteNonQuery(connectionString, commandType, commandText, (SqlParameter[]) null );
}
/// <summary>
/// 执行指定连接字符串,类型的SqlCommand.如果没有提供参数,不返回结果.
/// </summary>
/// <remarks>
/// 示例:
/// int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本, 其它.) </param>
/// <param name="commandText"> 存储过程名称或SQL语句 </param>
/// <param name="commandParameters"> SqlParameter参数数组 </param>
/// <returns> 返回命令影响的行数 </returns>
public static int ExecuteNonQuery( string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
using (SqlConnection connection = new SqlConnection(connectionString))
{
connection.Open();
return ExecuteNonQuery(connection, commandType, commandText, commandParameters);
}
}
/// <summary>
/// 执行指定连接字符串的存储过程,将对象数组的值赋给存储过程参数,
/// 此方法需要在参数缓存方法中探索参数并生成参数.
/// </summary>
/// <remarks>
/// 这个方法没有提供访问输出参数和返回值.
/// 示例:
/// int result = ExecuteNonQuery(connString, "PublishOrders", 24, 36);
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符串/param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="parameterValues"> 分配到存储过程输入参数的对象数组 </param>
/// <returns> 返回受影响的行数 </returns>
public static int ExecuteNonQuery( string connectionString, string spName, params object [] parameterValues)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果存在参数值
if ((parameterValues != null ) && (parameterValues.Length > 0 ))
{
// 从探索存储过程参数(加载到缓存)并分配给存储过程参数数组.
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
// 给存储过程参数赋值
AssignParameterValues(commandParameters, parameterValues);
return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
// 没有参数情况下
return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行指定数据库连接对象的命令
/// </summary>
/// <remarks>
/// 示例:
/// int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders");
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="commandType"> 命令类型(存储过程,命令文本或其它.) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <returns> 返回影响的行数 </returns>
public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText)
{
return ExecuteNonQuery(connection, commandType, commandText, (SqlParameter[]) null );
}
/// <summary>
/// 执行指定数据库连接对象的命令
/// </summary>
/// <remarks>
/// 示例:
/// int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="commandType"> 命令类型(存储过程,命令文本或其它.) </param>
/// <param name="commandText"> T存储过程名称或T-SQL语句 </param>
/// <param name="commandParameters"> SqlParamter参数数组 </param>
/// <returns> 返回影响的行数 </returns>
public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
// 创建SqlCommand命令,并进行预处理
SqlCommand cmd = new SqlCommand();
bool mustCloseConnection = false ;
PrepareCommand(cmd, connection, (SqlTransaction) null , commandType, commandText, commandParameters, out mustCloseConnection);
// Finally, execute the command
int retval = cmd.ExecuteNonQuery();
// 清除参数,以便再次使用.
cmd.Parameters.Clear();
if (mustCloseConnection)
connection.Close();
return retval;
}
/// <summary>
/// 执行指定数据库连接对象的命令,将对象数组的值赋给存储过程参数.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值
/// 示例:
/// int result = ExecuteNonQuery(conn, "PublishOrders", 24, 36);
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="spName"> 存储过程名 </param>
/// <param name="parameterValues"> 分配给存储过程输入参数的对象数组 </param>
/// <returns> 返回影响的行数 </returns>
public static int ExecuteNonQuery(SqlConnection connection, string spName, params object [] parameterValues)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果有参数值
if ((parameterValues != null ) && (parameterValues.Length > 0 ))
{
// 从缓存中加载存储过程参数
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
// 给存储过程分配参数值
AssignParameterValues(commandParameters, parameterValues);
return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行带事务的SqlCommand.
/// </summary>
/// <remarks>
/// 示例.:
/// int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders");
/// </remarks>
/// <param name="transaction"> 一个有效的数据库连接对象 </param>
/// <param name="commandType"> 命令类型(存储过程,命令文本或其它.) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <returns> 返回影响的行数/returns>
public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText)
{
return ExecuteNonQuery(transaction, commandType, commandText, (SqlParameter[]) null );
}
/// <summary>
/// 执行带事务的SqlCommand(指定参数).
/// </summary>
/// <remarks>
/// 示例:
/// int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="transaction"> 一个有效的数据库连接对象 </param>
/// <param name="commandType"> 命令类型(存储过程,命令文本或其它.) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <param name="commandParameters"> SqlParamter参数数组 </param>
/// <returns> 返回影响的行数 </returns>
public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (transaction == null ) throw new ArgumentNullException( " transaction " );
if (transaction != null && transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
// 预处理
SqlCommand cmd = new SqlCommand();
bool mustCloseConnection = false ;
PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);
// 执行
int retval = cmd.ExecuteNonQuery();
// 清除参数集,以便再次使用.
cmd.Parameters.Clear();
return retval;
}
/// <summary>
/// 执行带事务的SqlCommand(指定参数值).
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值
/// 示例:
/// int result = ExecuteNonQuery(conn, trans, "PublishOrders", 24, 36);
/// </remarks>
/// <param name="transaction"> 一个有效的数据库连接对象 </param>
/// <param name="spName"> 存储过程名 </param>
/// <param name="parameterValues"> 分配给存储过程输入参数的对象数组 </param>
/// <returns> 返回受影响的行数 </returns>
public static int ExecuteNonQuery(SqlTransaction transaction, string spName, params object [] parameterValues)
{
if (transaction == null ) throw new ArgumentNullException( " transaction " );
if (transaction != null && transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果有参数值
if ((parameterValues != null ) && (parameterValues.Length > 0 ))
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
// 给存储过程参数赋值
AssignParameterValues(commandParameters, parameterValues);
// 调用重载方法
return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
// 没有参数值
return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);
}
}
#endregion ExecuteNonQuery方法结束
#region ExecuteDataset方法
/// <summary>
/// 执行指定数据库连接字符串的命令,返回DataSet.
/// </summary>
/// <remarks>
/// 示例:
/// DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders");
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <returns> 返回一个包含结果集的DataSet </returns>
public static DataSet ExecuteDataset( string connectionString, CommandType commandType, string commandText)
{
return ExecuteDataset(connectionString, commandType, commandText, (SqlParameter[]) null );
}
/// <summary>
/// 执行指定数据库连接字符串的命令,返回DataSet.
/// </summary>
/// <remarks>
/// 示例:
/// DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <param name="commandParameters"> SqlParamters参数数组 </param>
/// <returns> 返回一个包含结果集的DataSet </returns>
public static DataSet ExecuteDataset( string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
// 创建并打开数据库连接对象,操作完成释放对象.
using (SqlConnection connection = new SqlConnection(connectionString))
{
connection.Open();
// 调用指定数据库连接字符串重载方法.
return ExecuteDataset(connection, commandType, commandText, commandParameters);
}
}
/// <summary>
/// 执行指定数据库连接字符串的命令,直接提供参数值,返回DataSet.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值.
/// 示例:
/// DataSet ds = ExecuteDataset(connString, "GetOrders", 24, 36);
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="spName"> 存储过程名 </param>
/// <param name="parameterValues"> 分配给存储过程输入参数的对象数组 </param>
/// <returns> 返回一个包含结果集的DataSet </returns>
public static DataSet ExecuteDataset( string connectionString, string spName, params object [] parameterValues)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
if ((parameterValues != null ) && (parameterValues.Length > 0 ))
{
// 从缓存中检索存储过程参数
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
// 给存储过程参数分配值
AssignParameterValues(commandParameters, parameterValues);
return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行指定数据库连接对象的命令,返回DataSet.
/// </summary>
/// <remarks>
/// 示例:
/// DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders");
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名或T-SQL语句 </param>
/// <returns> 返回一个包含结果集的DataSet </returns>
public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText)
{
return ExecuteDataset(connection, commandType, commandText, (SqlParameter[]) null );
}
/// <summary>
/// 执行指定数据库连接对象的命令,指定存储过程参数,返回DataSet.
/// </summary>
/// <remarks>
/// 示例:
/// DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名或T-SQL语句 </param>
/// <param name="commandParameters"> SqlParamter参数数组 </param>
/// <returns> 返回一个包含结果集的DataSet </returns>
public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
// 预处理
SqlCommand cmd = new SqlCommand();
bool mustCloseConnection = false ;
PrepareCommand(cmd, connection, (SqlTransaction) null , commandType, commandText, commandParameters, out mustCloseConnection);
// 创建SqlDataAdapter和DataSet.
using (SqlDataAdapter da = new SqlDataAdapter(cmd))
{
DataSet ds = new DataSet();
// 填充DataSet.
da.Fill(ds);
cmd.Parameters.Clear();
if (mustCloseConnection)
connection.Close();
return ds;
}
}
/// <summary>
/// 执行指定数据库连接对象的命令,指定参数值,返回DataSet.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输入参数和返回值.
/// 示例.:
/// DataSet ds = ExecuteDataset(conn, "GetOrders", 24, 36);
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="spName"> 存储过程名 </param>
/// <param name="parameterValues"> 分配给存储过程输入参数的对象数组 </param>
/// <returns> 返回一个包含结果集的DataSet </returns>
public static DataSet ExecuteDataset(SqlConnection connection, string spName, params object [] parameterValues)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
if ((parameterValues != null ) && (parameterValues.Length > 0 ))
{
// 比缓存中加载存储过程参数
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
// 给存储过程参数分配值
AssignParameterValues(commandParameters, parameterValues);
return ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return ExecuteDataset(connection, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行指定事务的命令,返回DataSet.
/// </summary>
/// <remarks>
/// 示例:
/// DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders");
/// </remarks>
/// <param name="transaction"> 事务 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名或T-SQL语句 </param>
/// <returns> 返回一个包含结果集的DataSet </returns>
public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText)
{
return ExecuteDataset(transaction, commandType, commandText, (SqlParameter[]) null );
}
/// <summary>
/// 执行指定事务的命令,指定参数,返回DataSet.
/// </summary>
/// <remarks>
/// 示例:
/// DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="transaction"> 事务 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名或T-SQL语句 </param>
/// <param name="commandParameters"> SqlParamter参数数组 </param>
/// <returns> 返回一个包含结果集的DataSet </returns>
public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (transaction == null ) throw new ArgumentNullException( " transaction " );
if (transaction != null && transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
// 预处理
SqlCommand cmd = new SqlCommand();
bool mustCloseConnection = false ;
PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);
// 创建 DataAdapter & DataSet
using (SqlDataAdapter da = new SqlDataAdapter(cmd))
{
DataSet ds = new DataSet();
da.Fill(ds);
cmd.Parameters.Clear();
return ds;
}
}
/// <summary>
/// 执行指定事务的命令,指定参数值,返回DataSet.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输入参数和返回值.
/// 示例.:
/// DataSet ds = ExecuteDataset(trans, "GetOrders", 24, 36);
/// </remarks>
/// <param name="transaction"> 事务 </param>
/// <param name="spName"> 存储过程名 </param>
/// <param name="parameterValues"> 分配给存储过程输入参数的对象数组 </param>
/// <returns> 返回一个包含结果集的DataSet </returns>
public static DataSet ExecuteDataset(SqlTransaction transaction, string spName, params object [] parameterValues)
{
if (transaction == null ) throw new ArgumentNullException( " transaction " );
if (transaction != null && transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
if ((parameterValues != null ) && (parameterValues.Length > 0 ))
{
// 从缓存中加载存储过程参数
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
// 给存储过程参数分配值
AssignParameterValues(commandParameters, parameterValues);
return ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return ExecuteDataset(transaction, CommandType.StoredProcedure, spName);
}
}
#endregion ExecuteDataset数据集命令结束
#region ExecuteReader 数据阅读器
/// <summary>
/// 枚举,标识数据库连接是由SqlHelper提供还是由调用者提供
/// </summary>
private enum SqlConnectionOwnership
{
/// <summary> 由SqlHelper提供连接 </summary>
Internal,
/// <summary> 由调用者提供连接 </summary>
External
}
/// <summary>
/// 执行指定数据库连接对象的数据阅读器.
/// </summary>
/// <remarks>
/// 如果是SqlHelper打开连接,当连接关闭DataReader也将关闭.
/// 如果是调用都打开连接,DataReader由调用都管理.
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="transaction"> 一个有效的事务,或者为 'null' </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名或T-SQL语句 </param>
/// <param name="commandParameters"> SqlParameters参数数组,如果没有参数则为'null' </param>
/// <param name="connectionOwnership"> 标识数据库连接对象是由调用者提供还是由SqlHelper提供 </param>
/// <returns> 返回包含结果集的SqlDataReader </returns>
private static SqlDataReader ExecuteReader(SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, SqlConnectionOwnership connectionOwnership)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
bool mustCloseConnection = false ;
// 创建命令
SqlCommand cmd = new SqlCommand();
try
{
PrepareCommand(cmd, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);
// 创建数据阅读器
SqlDataReader dataReader;
if (connectionOwnership == SqlConnectionOwnership.External)
{
dataReader = cmd.ExecuteReader();
}
else
{
dataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
}
// 清除参数,以便再次使用..
// HACK: There is a problem here, the output parameter values are fletched
// when the reader is closed, so if the parameters are detached from the command
// then the SqlReader can磘 set its values.
// When this happen, the parameters can磘 be used again in other command.
bool canClear = true ;
foreach (SqlParameter commandParameter in cmd.Parameters)
{
if (commandParameter.Direction != ParameterDirection.Input)
canClear = false ;
}
if (canClear)
{
cmd.Parameters.Clear();
}
return dataReader;
}
catch
{
if (mustCloseConnection)
connection.Close();
throw ;
}
}
/// <summary>
/// 执行指定数据库连接字符串的数据阅读器.
/// </summary>
/// <remarks>
/// 示例:
/// SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders");
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名或T-SQL语句 </param>
/// <returns> 返回包含结果集的SqlDataReader </returns>
public static SqlDataReader ExecuteReader( string connectionString, CommandType commandType, string commandText)
{
return ExecuteReader(connectionString, commandType, commandText, (SqlParameter[]) null );
}
/// <summary>
/// 执行指定数据库连接字符串的数据阅读器,指定参数.
/// </summary>
/// <remarks>
/// 示例:
/// SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名或T-SQL语句 </param>
/// <param name="commandParameters"> SqlParamter参数数组(new SqlParameter("@prodid", 24)) </param>
/// <returns> 返回包含结果集的SqlDataReader </returns>
public static SqlDataReader ExecuteReader( string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
SqlConnection connection = null ;
try
{
connection = new SqlConnection(connectionString);
connection.Open();
return ExecuteReader(connection, null , commandType, commandText, commandParameters, SqlConnectionOwnership.Internal);
}
catch
{
// If we fail to return the SqlDatReader, we need to close the connection ourselves
if (connection != null ) connection.Close();
throw ;
}
}
/// <summary>
/// 执行指定数据库连接字符串的数据阅读器,指定参数值.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值参数.
/// 示例:
/// SqlDataReader dr = ExecuteReader(connString, "GetOrders", 24, 36);
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="spName"> 存储过程名 </param>
/// <param name="parameterValues"> 分配给存储过程输入参数的对象数组 </param>
/// <returns> 返回包含结果集的SqlDataReader </returns>
public static SqlDataReader ExecuteReader( string connectionString, string spName, params object [] parameterValues)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
if ((parameterValues != null ) && (parameterValues.Length > 0 ))
{
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
AssignParameterValues(commandParameters, parameterValues);
return ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return ExecuteReader(connectionString, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行指定数据库连接对象的数据阅读器.
/// </summary>
/// <remarks>
/// 示例:
/// SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders");
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名或T-SQL语句 </param>
/// <returns> 返回包含结果集的SqlDataReader </returns>
public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText)
{
return ExecuteReader(connection, commandType, commandText, (SqlParameter[]) null );
}
/// <summary>
/// [调用者方式]执行指定数据库连接对象的数据阅读器,指定参数.
/// </summary>
/// <remarks>
/// 示例:
/// SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandParameters"> SqlParamter参数数组 </param>
/// <returns> 返回包含结果集的SqlDataReader </returns>
public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
return ExecuteReader(connection, (SqlTransaction) null , commandType, commandText, commandParameters, SqlConnectionOwnership.External);
}
/// <summary>
/// [调用者方式]执行指定数据库连接对象的数据阅读器,指定参数值.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值参数.
/// 示例:
/// SqlDataReader dr = ExecuteReader(conn, "GetOrders", 24, 36);
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="spName"> T存储过程名 </param>
/// <param name="parameterValues"> 分配给存储过程输入参数的对象数组 </param>
/// <returns> 返回包含结果集的SqlDataReader </returns>
public static SqlDataReader ExecuteReader(SqlConnection connection, string spName, params object [] parameterValues)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
if ((parameterValues != null ) && (parameterValues.Length > 0 ))
{
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
AssignParameterValues(commandParameters, parameterValues);
return ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return ExecuteReader(connection, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// [调用者方式]执行指定数据库事务的数据阅读器,指定参数值.
/// </summary>
/// <remarks>
/// 示例:
/// SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders");
/// </remarks>
/// <param name="transaction"> 一个有效的连接事务 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <returns> 返回包含结果集的SqlDataReader </returns>
public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText)
{
return ExecuteReader(transaction, commandType, commandText, (SqlParameter[]) null );
}
/// <summary>
/// [调用者方式]执行指定数据库事务的数据阅读器,指定参数.
/// </summary>
/// <remarks>
/// 示例:
/// SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="transaction"> 一个有效的连接事务 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <param name="commandParameters"> 分配给命令的SqlParamter参数数组 </param>
/// <returns> 返回包含结果集的SqlDataReader </returns>
public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (transaction == null ) throw new ArgumentNullException( " transaction " );
if (transaction != null && transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
return ExecuteReader(transaction.Connection, transaction, commandType, commandText, commandParameters, SqlConnectionOwnership.External);
}
/// <summary>
/// [调用者方式]执行指定数据库事务的数据阅读器,指定参数值.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值参数.
///
/// 示例:
/// SqlDataReader dr = ExecuteReader(trans, "GetOrders", 24, 36);
/// </remarks>
/// <param name="transaction"> 一个有效的连接事务 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="parameterValues"> 分配给存储过程输入参数的对象数组 </param>
/// <returns> 返回包含结果集的SqlDataReader </returns>
public static SqlDataReader ExecuteReader(SqlTransaction transaction, string spName, params object [] parameterValues)
{
if (transaction == null ) throw new ArgumentNullException( " transaction " );
if (transaction != null && transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果有参数值
if ((parameterValues != null ) && (parameterValues.Length > 0 ))
{
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
AssignParameterValues(commandParameters, parameterValues);
return ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
// 没有参数值
return ExecuteReader(transaction, CommandType.StoredProcedure, spName);
}
}
#endregion ExecuteReader数据阅读器
#region ExecuteScalar 返回结果集中的第一行第一列
/// <summary>
/// 执行指定数据库连接字符串的命令,返回结果集中的第一行第一列.
/// </summary>
/// <remarks>
/// 示例:
/// int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount");
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <returns> 返回结果集中的第一行第一列 </returns>
public static object ExecuteScalar( string connectionString, CommandType commandType, string commandText)
{
// 执行参数为空的方法
return ExecuteScalar(connectionString, commandType, commandText, (SqlParameter[]) null );
}
/// <summary>
/// 执行指定数据库连接字符串的命令,指定参数,返回结果集中的第一行第一列.
/// </summary>
/// <remarks>
/// 示例:
/// int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <param name="commandParameters"> 分配给命令的SqlParamter参数数组 </param>
/// <returns> 返回结果集中的第一行第一列 </returns>
public static object ExecuteScalar( string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
// 创建并打开数据库连接对象,操作完成释放对象.
using (SqlConnection connection = new SqlConnection(connectionString))
{
connection.Open();
// 调用指定数据库连接字符串重载方法.
return ExecuteScalar(connection, commandType, commandText, commandParameters);
}
}
/// <summary>
/// 执行指定数据库连接字符串的命令,指定参数值,返回结果集中的第一行第一列.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值参数.
///
/// 示例:
/// int orderCount = (int)ExecuteScalar(connString, "GetOrderCount", 24, 36);
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="parameterValues"> 分配给存储过程输入参数的对象数组 </param>
/// <returns> 返回结果集中的第一行第一列 </returns>
public static object ExecuteScalar( string connectionString, string spName, params object [] parameterValues)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果有参数值
if ((parameterValues != null ) && (parameterValues.Length > 0 ))
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
// 给存储过程参数赋值
AssignParameterValues(commandParameters, parameterValues);
// 调用重载方法
return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
// 没有参数值
return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行指定数据库连接对象的命令,返回结果集中的第一行第一列.
/// </summary>
/// <remarks>
/// 示例:
/// int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount");
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <returns> 返回结果集中的第一行第一列 </returns>
public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText)
{
// 执行参数为空的方法
return ExecuteScalar(connection, commandType, commandText, (SqlParameter[]) null );
}
/// <summary>
/// 执行指定数据库连接对象的命令,指定参数,返回结果集中的第一行第一列.
/// </summary>
/// <remarks>
/// 示例:
/// int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <param name="commandParameters"> 分配给命令的SqlParamter参数数组 </param>
/// <returns> 返回结果集中的第一行第一列 </returns>
public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
// 创建SqlCommand命令,并进行预处理
SqlCommand cmd = new SqlCommand();
bool mustCloseConnection = false ;
PrepareCommand(cmd, connection, (SqlTransaction) null , commandType, commandText, commandParameters, out mustCloseConnection);
// 执行SqlCommand命令,并返回结果.
object retval = cmd.ExecuteScalar();
// 清除参数,以便再次使用.
cmd.Parameters.Clear();
if (mustCloseConnection)
connection.Close();
return retval;
}
/// <summary>
/// 执行指定数据库连接对象的命令,指定参数值,返回结果集中的第一行第一列.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值参数.
///
/// 示例:
/// int orderCount = (int)ExecuteScalar(conn, "GetOrderCount", 24, 36);
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="parameterValues"> 分配给存储过程输入参数的对象数组 </param>
/// <returns> 返回结果集中的第一行第一列 </returns>
public static object ExecuteScalar(SqlConnection connection, string spName, params object [] parameterValues)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果有参数值
if ((parameterValues != null ) && (parameterValues.Length > 0 ))
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
// 给存储过程参数赋值
AssignParameterValues(commandParameters, parameterValues);
// 调用重载方法
return ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
// 没有参数值
return ExecuteScalar(connection, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行指定数据库事务的命令,返回结果集中的第一行第一列.
/// </summary>
/// <remarks>
/// 示例:
/// int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount");
/// </remarks>
/// <param name="transaction"> 一个有效的连接事务 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <returns> 返回结果集中的第一行第一列 </returns>
public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText)
{
// 执行参数为空的方法
return ExecuteScalar(transaction, commandType, commandText, (SqlParameter[]) null );
}
/// <summary>
/// 执行指定数据库事务的命令,指定参数,返回结果集中的第一行第一列.
/// </summary>
/// <remarks>
/// 示例:
/// int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="transaction"> 一个有效的连接事务 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <param name="commandParameters"> 分配给命令的SqlParamter参数数组 </param>
/// <returns> 返回结果集中的第一行第一列 </returns>
public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (transaction == null ) throw new ArgumentNullException( " transaction " );
if (transaction != null && transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
// 创建SqlCommand命令,并进行预处理
SqlCommand cmd = new SqlCommand();
bool mustCloseConnection = false ;
PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);
// 执行SqlCommand命令,并返回结果.
object retval = cmd.ExecuteScalar();
// 清除参数,以便再次使用.
cmd.Parameters.Clear();
return retval;
}
/// <summary>
/// 执行指定数据库事务的命令,指定参数值,返回结果集中的第一行第一列.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值参数.
///
/// 示例:
/// int orderCount = (int)ExecuteScalar(trans, "GetOrderCount", 24, 36);
/// </remarks>
/// <param name="transaction"> 一个有效的连接事务 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="parameterValues"> 分配给存储过程输入参数的对象数组 </param>
/// <returns> 返回结果集中的第一行第一列 </returns>
public static object ExecuteScalar(SqlTransaction transaction, string spName, params object [] parameterValues)
{
if (transaction == null ) throw new ArgumentNullException( " transaction " );
if (transaction != null && transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果有参数值
if ((parameterValues != null ) && (parameterValues.Length > 0 ))
{
// PPull the parameters for this stored procedure from the parameter cache ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
// 给存储过程参数赋值
AssignParameterValues(commandParameters, parameterValues);
// 调用重载方法
return ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
// 没有参数值
return ExecuteScalar(transaction, CommandType.StoredProcedure, spName);
}
}
#endregion ExecuteScalar
#region ExecuteXmlReader XML阅读器
/// <summary>
/// 执行指定数据库连接对象的SqlCommand命令,并产生一个XmlReader对象做为结果集返回.
/// </summary>
/// <remarks>
/// 示例:
/// XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders");
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 using "FOR XML AUTO" </param>
/// <returns> 返回XmlReader结果集对象. </returns>
public static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText)
{
// 执行参数为空的方法
return ExecuteXmlReader(connection, commandType, commandText, (SqlParameter[]) null );
}
/// <summary>
/// 执行指定数据库连接对象的SqlCommand命令,并产生一个XmlReader对象做为结果集返回,指定参数.
/// </summary>
/// <remarks>
/// 示例:
/// XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 using "FOR XML AUTO" </param>
/// <param name="commandParameters"> 分配给命令的SqlParamter参数数组 </param>
/// <returns> 返回XmlReader结果集对象. </returns>
public static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
bool mustCloseConnection = false ;
// 创建SqlCommand命令,并进行预处理
SqlCommand cmd = new SqlCommand();
try
{
PrepareCommand(cmd, connection, (SqlTransaction) null , commandType, commandText, commandParameters, out mustCloseConnection);
// 执行命令
XmlReader retval = cmd.ExecuteXmlReader();
// 清除参数,以便再次使用.
cmd.Parameters.Clear();
return retval;
}
catch
{
if (mustCloseConnection)
connection.Close();
throw ;
}
}
/// <summary>
/// 执行指定数据库连接对象的SqlCommand命令,并产生一个XmlReader对象做为结果集返回,指定参数值.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值参数.
///
/// 示例:
/// XmlReader r = ExecuteXmlReader(conn, "GetOrders", 24, 36);
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="spName"> 存储过程名称 using "FOR XML AUTO" </param>
/// <param name="parameterValues"> 分配给存储过程输入参数的对象数组 </param>
/// <returns> 返回XmlReader结果集对象. </returns>
public static XmlReader ExecuteXmlReader(SqlConnection connection, string spName, params object [] parameterValues)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果有参数值
if ((parameterValues != null ) && (parameterValues.Length > 0 ))
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
// 给存储过程参数赋值
AssignParameterValues(commandParameters, parameterValues);
// 调用重载方法
return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
// 没有参数值
return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行指定数据库事务的SqlCommand命令,并产生一个XmlReader对象做为结果集返回.
/// </summary>
/// <remarks>
/// 示例:
/// XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders");
/// </remarks>
/// <param name="transaction"> 一个有效的连接事务 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 using "FOR XML AUTO" </param>
/// <returns> 返回XmlReader结果集对象. </returns>
public static XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText)
{
// 执行参数为空的方法
return ExecuteXmlReader(transaction, commandType, commandText, (SqlParameter[]) null );
}
/// <summary>
/// 执行指定数据库事务的SqlCommand命令,并产生一个XmlReader对象做为结果集返回,指定参数.
/// </summary>
/// <remarks>
/// 示例:
/// XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="transaction"> 一个有效的连接事务 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 using "FOR XML AUTO" </param>
/// <param name="commandParameters"> 分配给命令的SqlParamter参数数组 </param>
/// <returns> 返回XmlReader结果集对象. </returns>
public static XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (transaction == null ) throw new ArgumentNullException( " transaction " );
if (transaction != null && transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
// 创建SqlCommand命令,并进行预处理
SqlCommand cmd = new SqlCommand();
bool mustCloseConnection = false ;
PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);
// 执行命令
XmlReader retval = cmd.ExecuteXmlReader();
// 清除参数,以便再次使用.
cmd.Parameters.Clear();
return retval;
}
/// <summary>
/// 执行指定数据库事务的SqlCommand命令,并产生一个XmlReader对象做为结果集返回,指定参数值.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值参数.
///
/// 示例:
/// XmlReader r = ExecuteXmlReader(trans, "GetOrders", 24, 36);
/// </remarks>
/// <param name="transaction"> 一个有效的连接事务 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="parameterValues"> 分配给存储过程输入参数的对象数组 </param>
/// <returns> 返回一个包含结果集的DataSet. </returns>
public static XmlReader ExecuteXmlReader(SqlTransaction transaction, string spName, params object [] parameterValues)
{
if (transaction == null ) throw new ArgumentNullException( " transaction " );
if (transaction != null && transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果有参数值
if ((parameterValues != null ) && (parameterValues.Length > 0 ))
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
// 给存储过程参数赋值
AssignParameterValues(commandParameters, parameterValues);
// 调用重载方法
return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
// 没有参数值
return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName);
}
}
#endregion ExecuteXmlReader 阅读器结束
#region FillDataset 填充数据集
/// <summary>
/// 执行指定数据库连接字符串的命令,映射数据表并填充数据集.
/// </summary>
/// <remarks>
/// 示例:
/// FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <param name="dataSet"> 要填充结果集的DataSet实例 </param>
/// <param name="tableNames"> 表映射的数据表数组
/// 用户定义的表名 (可有是实际的表名.) </param>
public static void FillDataset( string connectionString, CommandType commandType, string commandText, DataSet dataSet, string [] tableNames)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
if (dataSet == null ) throw new ArgumentNullException( " dataSet " );
// 创建并打开数据库连接对象,操作完成释放对象.
using (SqlConnection connection = new SqlConnection(connectionString))
{
connection.Open();
// 调用指定数据库连接字符串重载方法.
FillDataset(connection, commandType, commandText, dataSet, tableNames);
}
}
/// <summary>
/// 执行指定数据库连接字符串的命令,映射数据表并填充数据集.指定命令参数.
/// </summary>
/// <remarks>
/// 示例:
/// FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <param name="commandParameters"> 分配给命令的SqlParamter参数数组 </param>
/// <param name="dataSet"> 要填充结果集的DataSet实例 </param>
/// <param name="tableNames"> 表映射的数据表数组
/// 用户定义的表名 (可有是实际的表名.)
/// </param>
public static void FillDataset( string connectionString, CommandType commandType,
string commandText, DataSet dataSet, string [] tableNames,
params SqlParameter[] commandParameters)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
if (dataSet == null ) throw new ArgumentNullException( " dataSet " );
// 创建并打开数据库连接对象,操作完成释放对象.
using (SqlConnection connection = new SqlConnection(connectionString))
{
connection.Open();
// 调用指定数据库连接字符串重载方法.
FillDataset(connection, commandType, commandText, dataSet, tableNames, commandParameters);
}
}
/// <summary>
/// 执行指定数据库连接字符串的命令,映射数据表并填充数据集,指定存储过程参数值.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值参数.
///
/// 示例:
/// FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, 24);
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataSet"> 要填充结果集的DataSet实例 </param>
/// <param name="tableNames"> 表映射的数据表数组
/// 用户定义的表名 (可有是实际的表名.)
/// </param>
/// <param name="parameterValues"> 分配给存储过程输入参数的对象数组 </param>
public static void FillDataset( string connectionString, string spName,
DataSet dataSet, string [] tableNames,
params object [] parameterValues)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
if (dataSet == null ) throw new ArgumentNullException( " dataSet " );
// 创建并打开数据库连接对象,操作完成释放对象.
using (SqlConnection connection = new SqlConnection(connectionString))
{
connection.Open();
// 调用指定数据库连接字符串重载方法.
FillDataset(connection, spName, dataSet, tableNames, parameterValues);
}
}
/// <summary>
/// 执行指定数据库连接对象的命令,映射数据表并填充数据集.
/// </summary>
/// <remarks>
/// 示例:
/// FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <param name="dataSet"> 要填充结果集的DataSet实例 </param>
/// <param name="tableNames"> 表映射的数据表数组
/// 用户定义的表名 (可有是实际的表名.)
/// </param>
public static void FillDataset(SqlConnection connection, CommandType commandType,
string commandText, DataSet dataSet, string [] tableNames)
{
FillDataset(connection, commandType, commandText, dataSet, tableNames, null );
}
/// <summary>
/// 执行指定数据库连接对象的命令,映射数据表并填充数据集,指定参数.
/// </summary>
/// <remarks>
/// 示例:
/// FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <param name="dataSet"> 要填充结果集的DataSet实例 </param>
/// <param name="tableNames"> 表映射的数据表数组
/// 用户定义的表名 (可有是实际的表名.)
/// </param>
/// <param name="commandParameters"> 分配给命令的SqlParamter参数数组 </param>
public static void FillDataset(SqlConnection connection, CommandType commandType,
string commandText, DataSet dataSet, string [] tableNames,
params SqlParameter[] commandParameters)
{
FillDataset(connection, null , commandType, commandText, dataSet, tableNames, commandParameters);
}
/// <summary>
/// 执行指定数据库连接对象的命令,映射数据表并填充数据集,指定存储过程参数值.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值参数.
///
/// 示例:
/// FillDataset(conn, "GetOrders", ds, new string[] {"orders"}, 24, 36);
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataSet"> 要填充结果集的DataSet实例 </param>
/// <param name="tableNames"> 表映射的数据表数组
/// 用户定义的表名 (可有是实际的表名.)
/// </param>
/// <param name="parameterValues"> 分配给存储过程输入参数的对象数组 </param>
public static void FillDataset(SqlConnection connection, string spName,
DataSet dataSet, string [] tableNames,
params object [] parameterValues)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
if (dataSet == null ) throw new ArgumentNullException( " dataSet " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果有参数值
if ((parameterValues != null ) && (parameterValues.Length > 0 ))
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
// 给存储过程参数赋值
AssignParameterValues(commandParameters, parameterValues);
// 调用重载方法
FillDataset(connection, CommandType.StoredProcedure, spName, dataSet, tableNames, commandParameters);
}
else
{
// 没有参数值
FillDataset(connection, CommandType.StoredProcedure, spName, dataSet, tableNames);
}
}
/// <summary>
/// 执行指定数据库事务的命令,映射数据表并填充数据集.
/// </summary>
/// <remarks>
/// 示例:
/// FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
/// </remarks>
/// <param name="transaction"> 一个有效的连接事务 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <param name="dataSet"> 要填充结果集的DataSet实例 </param>
/// <param name="tableNames"> 表映射的数据表数组
/// 用户定义的表名 (可有是实际的表名.)
/// </param>
public static void FillDataset(SqlTransaction transaction, CommandType commandType,
string commandText,
DataSet dataSet, string [] tableNames)
{
FillDataset(transaction, commandType, commandText, dataSet, tableNames, null );
}
/// <summary>
/// 执行指定数据库事务的命令,映射数据表并填充数据集,指定参数.
/// </summary>
/// <remarks>
/// 示例:
/// FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="transaction"> 一个有效的连接事务 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <param name="dataSet"> 要填充结果集的DataSet实例 </param>
/// <param name="tableNames"> 表映射的数据表数组
/// 用户定义的表名 (可有是实际的表名.)
/// </param>
/// <param name="commandParameters"> 分配给命令的SqlParamter参数数组 </param>
public static void FillDataset(SqlTransaction transaction, CommandType commandType,
string commandText, DataSet dataSet, string [] tableNames,
params SqlParameter[] commandParameters)
{
FillDataset(transaction.Connection, transaction, commandType, commandText, dataSet, tableNames, commandParameters);
}
/// <summary>
/// 执行指定数据库事务的命令,映射数据表并填充数据集,指定存储过程参数值.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值参数.
///
/// 示例:
/// FillDataset(trans, "GetOrders", ds, new string[]{"orders"}, 24, 36);
/// </remarks>
/// <param name="transaction"> 一个有效的连接事务 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataSet"> 要填充结果集的DataSet实例 </param>
/// <param name="tableNames"> 表映射的数据表数组
/// 用户定义的表名 (可有是实际的表名.)
/// </param>
/// <param name="parameterValues"> 分配给存储过程输入参数的对象数组 </param>
public static void FillDataset(SqlTransaction transaction, string spName,
DataSet dataSet, string [] tableNames,
params object [] parameterValues)
{
if (transaction == null ) throw new ArgumentNullException( " transaction " );
if (transaction != null && transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
if (dataSet == null ) throw new ArgumentNullException( " dataSet " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果有参数值
if ((parameterValues != null ) && (parameterValues.Length > 0 ))
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
// 给存储过程参数赋值
AssignParameterValues(commandParameters, parameterValues);
// 调用重载方法
FillDataset(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames, commandParameters);
}
else
{
// 没有参数值
FillDataset(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames);
}
}
/// <summary>
/// [私有方法][内部调用]执行指定数据库连接对象/事务的命令,映射数据表并填充数据集,DataSet/TableNames/SqlParameters.
/// </summary>
/// <remarks>
/// 示例:
/// FillDataset(conn, trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="transaction"> 一个有效的连接事务 </param>
/// <param name="commandType"> 命令类型 (存储过程,命令文本或其它) </param>
/// <param name="commandText"> 存储过程名称或T-SQL语句 </param>
/// <param name="dataSet"> 要填充结果集的DataSet实例 </param>
/// <param name="tableNames"> 表映射的数据表数组
/// 用户定义的表名 (可有是实际的表名.)
/// </param>
/// <param name="commandParameters"> 分配给命令的SqlParamter参数数组 </param>
private static void FillDataset(SqlConnection connection, SqlTransaction transaction, CommandType commandType,
string commandText, DataSet dataSet, string [] tableNames,
params SqlParameter[] commandParameters)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
if (dataSet == null ) throw new ArgumentNullException( " dataSet " );
// 创建SqlCommand命令,并进行预处理
SqlCommand command = new SqlCommand();
bool mustCloseConnection = false ;
PrepareCommand(command, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);
// 执行命令
using (SqlDataAdapter dataAdapter = new SqlDataAdapter(command))
{
// 追加表映射
if (tableNames != null && tableNames.Length > 0 )
{
string tableName = " Table " ;
for ( int index = 0 ; index < tableNames.Length; index ++ )
{
if (tableNames[index] == null || tableNames[index].Length == 0 ) throw new ArgumentException( " The tableNames parameter must contain a list of tables, a value was provided as null or empty string. " , " tableNames " );
dataAdapter.TableMappings.Add(tableName, tableNames[index]);
tableName += (index + 1 ).ToString();
}
}
// 填充数据集使用默认表名称
dataAdapter.Fill(dataSet);
// 清除参数,以便再次使用.
command.Parameters.Clear();
}
if (mustCloseConnection)
connection.Close();
}
#endregion
#region UpdateDataset 更新数据集
/// <summary>
/// 执行数据集更新到数据库,指定inserted, updated, or deleted命令.
/// </summary>
/// <remarks>
/// 示例:
/// UpdateDataset(conn, insertCommand, deleteCommand, updateCommand, dataSet, "Order");
/// </remarks>
/// <param name="insertCommand"> [追加记录]一个有效的T-SQL语句或存储过程 </param>
/// <param name="deleteCommand"> [删除记录]一个有效的T-SQL语句或存储过程 </param>
/// <param name="updateCommand"> [更新记录]一个有效的T-SQL语句或存储过程 </param>
/// <param name="dataSet"> 要更新到数据库的DataSet </param>
/// <param name="tableName"> 要更新到数据库的DataTable </param>
public static void UpdateDataset(SqlCommand insertCommand, SqlCommand deleteCommand, SqlCommand updateCommand, DataSet dataSet, string tableName)
{
if (insertCommand == null ) throw new ArgumentNullException( " insertCommand " );
if (deleteCommand == null ) throw new ArgumentNullException( " deleteCommand " );
if (updateCommand == null ) throw new ArgumentNullException( " updateCommand " );
if (tableName == null || tableName.Length == 0 ) throw new ArgumentNullException( " tableName " );
// 创建SqlDataAdapter,当操作完成后释放.
using (SqlDataAdapter dataAdapter = new SqlDataAdapter())
{
// 设置数据适配器命令
dataAdapter.UpdateCommand = updateCommand;
dataAdapter.InsertCommand = insertCommand;
dataAdapter.DeleteCommand = deleteCommand;
// 更新数据集改变到数据库
dataAdapter.Update(dataSet, tableName);
// 提交所有改变到数据集.
dataSet.AcceptChanges();
}
}
#endregion
#region CreateCommand 创建一条SqlCommand命令
/// <summary>
/// 创建SqlCommand命令,指定数据库连接对象,存储过程名和参数.
/// </summary>
/// <remarks>
/// 示例:
/// SqlCommand command = CreateCommand(conn, "AddCustomer", "CustomerID", "CustomerName");
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="sourceColumns"> 源表的列名称数组 </param>
/// <returns> 返回SqlCommand命令 </returns>
public static SqlCommand CreateCommand(SqlConnection connection, string spName, params string [] sourceColumns)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 创建命令
SqlCommand cmd = new SqlCommand(spName, connection);
cmd.CommandType = CommandType.StoredProcedure;
// 如果有参数值
if ((sourceColumns != null ) && (sourceColumns.Length > 0 ))
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
// 将源表的列到映射到DataSet命令中.
for ( int index = 0 ; index < sourceColumns.Length; index ++ )
commandParameters[index].SourceColumn = sourceColumns[index];
// Attach the discovered parameters to the SqlCommand object
AttachParameters(cmd, commandParameters);
}
return cmd;
}
#endregion
#region ExecuteNonQueryTypedParams 类型化参数(DataRow)
/// <summary>
/// 执行指定连接数据库连接字符串的存储过程,使用DataRow做为参数值,返回受影响的行数.
/// </summary>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataRow"> 使用DataRow作为参数值 </param>
/// <returns> 返回影响的行数 </returns>
public static int ExecuteNonQueryTypedParams(String connectionString, String spName, DataRow dataRow)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果row有值,存储过程必须初始化.
if (dataRow != null && dataRow.ItemArray.Length > 0 )
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
// 分配参数值
AssignParameterValues(commandParameters, dataRow);
return SqlHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return SqlHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行指定连接数据库连接对象的存储过程,使用DataRow做为参数值,返回受影响的行数.
/// </summary>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataRow"> 使用DataRow作为参数值 </param>
/// <returns> 返回影响的行数 </returns>
public static int ExecuteNonQueryTypedParams(SqlConnection connection, String spName, DataRow dataRow)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果row有值,存储过程必须初始化.
if (dataRow != null && dataRow.ItemArray.Length > 0 )
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
// 分配参数值
AssignParameterValues(commandParameters, dataRow);
return SqlHelper.ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return SqlHelper.ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行指定连接数据库事物的存储过程,使用DataRow做为参数值,返回受影响的行数.
/// </summary>
/// <param name="transaction"> 一个有效的连接事务 object </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataRow"> 使用DataRow作为参数值 </param>
/// <returns> 返回影响的行数 </returns>
public static int ExecuteNonQueryTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
{
if (transaction == null ) throw new ArgumentNullException( " transaction " );
if (transaction != null && transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// Sf the row has values, the store procedure parameters must be initialized
if (dataRow != null && dataRow.ItemArray.Length > 0 )
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
// 分配参数值
AssignParameterValues(commandParameters, dataRow);
return SqlHelper.ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return SqlHelper.ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);
}
}
#endregion
#region ExecuteDatasetTypedParams 类型化参数(DataRow)
/// <summary>
/// 执行指定连接数据库连接字符串的存储过程,使用DataRow做为参数值,返回DataSet.
/// </summary>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataRow"> 使用DataRow作为参数值 </param>
/// <returns> 返回一个包含结果集的DataSet. </returns>
public static DataSet ExecuteDatasetTypedParams( string connectionString, String spName, DataRow dataRow)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果row有值,存储过程必须初始化.
if (dataRow != null && dataRow.ItemArray.Length > 0 )
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
// 分配参数值
AssignParameterValues(commandParameters, dataRow);
return SqlHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return SqlHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行指定连接数据库连接对象的存储过程,使用DataRow做为参数值,返回DataSet.
/// </summary>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataRow"> 使用DataRow作为参数值 </param>
/// <returns> 返回一个包含结果集的DataSet. </returns>
///
public static DataSet ExecuteDatasetTypedParams(SqlConnection connection, String spName, DataRow dataRow)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果row有值,存储过程必须初始化.
if (dataRow != null && dataRow.ItemArray.Length > 0 )
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
// 分配参数值
AssignParameterValues(commandParameters, dataRow);
return SqlHelper.ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return SqlHelper.ExecuteDataset(connection, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行指定连接数据库事务的存储过程,使用DataRow做为参数值,返回DataSet.
/// </summary>
/// <param name="transaction"> 一个有效的连接事务 object </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataRow"> 使用DataRow作为参数值 </param>
/// <returns> 返回一个包含结果集的DataSet. </returns>
public static DataSet ExecuteDatasetTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
{
if (transaction == null ) throw new ArgumentNullException( " transaction " );
if (transaction != null && transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果row有值,存储过程必须初始化.
if (dataRow != null && dataRow.ItemArray.Length > 0 )
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
// 分配参数值
AssignParameterValues(commandParameters, dataRow);
return SqlHelper.ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return SqlHelper.ExecuteDataset(transaction, CommandType.StoredProcedure, spName);
}
}
#endregion
#region ExecuteReaderTypedParams 类型化参数(DataRow)
/// <summary>
/// 执行指定连接数据库连接字符串的存储过程,使用DataRow做为参数值,返回DataReader.
/// </summary>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataRow"> 使用DataRow作为参数值 </param>
/// <returns> 返回包含结果集的SqlDataReader </returns>
public static SqlDataReader ExecuteReaderTypedParams(String connectionString, String spName, DataRow dataRow)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果row有值,存储过程必须初始化.
if (dataRow != null && dataRow.ItemArray.Length > 0 )
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
// 分配参数值
AssignParameterValues(commandParameters, dataRow);
return SqlHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return SqlHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行指定连接数据库连接对象的存储过程,使用DataRow做为参数值,返回DataReader.
/// </summary>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataRow"> 使用DataRow作为参数值 </param>
/// <returns> 返回包含结果集的SqlDataReader </returns>
public static SqlDataReader ExecuteReaderTypedParams(SqlConnection connection, String spName, DataRow dataRow)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果row有值,存储过程必须初始化.
if (dataRow != null && dataRow.ItemArray.Length > 0 )
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
// 分配参数值
AssignParameterValues(commandParameters, dataRow);
return SqlHelper.ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return SqlHelper.ExecuteReader(connection, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行指定连接数据库事物的存储过程,使用DataRow做为参数值,返回DataReader.
/// </summary>
/// <param name="transaction"> 一个有效的连接事务 object </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataRow"> 使用DataRow作为参数值 </param>
/// <returns> 返回包含结果集的SqlDataReader </returns>
public static SqlDataReader ExecuteReaderTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
{
if (transaction == null ) throw new ArgumentNullException( " transaction " );
if (transaction != null && transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果row有值,存储过程必须初始化.
if (dataRow != null && dataRow.ItemArray.Length > 0 )
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
// 分配参数值
AssignParameterValues(commandParameters, dataRow);
return SqlHelper.ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return SqlHelper.ExecuteReader(transaction, CommandType.StoredProcedure, spName);
}
}
#endregion
#region ExecuteScalarTypedParams 类型化参数(DataRow)
/// <summary>
/// 执行指定连接数据库连接字符串的存储过程,使用DataRow做为参数值,返回结果集中的第一行第一列.
/// </summary>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataRow"> 使用DataRow作为参数值 </param>
/// <returns> 返回结果集中的第一行第一列 </returns>
public static object ExecuteScalarTypedParams(String connectionString, String spName, DataRow dataRow)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果row有值,存储过程必须初始化.
if (dataRow != null && dataRow.ItemArray.Length > 0 )
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
// 分配参数值
AssignParameterValues(commandParameters, dataRow);
return SqlHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return SqlHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行指定连接数据库连接对象的存储过程,使用DataRow做为参数值,返回结果集中的第一行第一列.
/// </summary>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataRow"> 使用DataRow作为参数值 </param>
/// <returns> 返回结果集中的第一行第一列 </returns>
public static object ExecuteScalarTypedParams(SqlConnection connection, String spName, DataRow dataRow)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果row有值,存储过程必须初始化.
if (dataRow != null && dataRow.ItemArray.Length > 0 )
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
// 分配参数值
AssignParameterValues(commandParameters, dataRow);
return SqlHelper.ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return SqlHelper.ExecuteScalar(connection, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行指定连接数据库事务的存储过程,使用DataRow做为参数值,返回结果集中的第一行第一列.
/// </summary>
/// <param name="transaction"> 一个有效的连接事务 object </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataRow"> 使用DataRow作为参数值 </param>
/// <returns> 返回结果集中的第一行第一列 </returns>
public static object ExecuteScalarTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
{
if (transaction == null ) throw new ArgumentNullException( " transaction " );
if (transaction != null && transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果row有值,存储过程必须初始化.
if (dataRow != null && dataRow.ItemArray.Length > 0 )
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
// 分配参数值
AssignParameterValues(commandParameters, dataRow);
return SqlHelper.ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return SqlHelper.ExecuteScalar(transaction, CommandType.StoredProcedure, spName);
}
}
#endregion
#region ExecuteXmlReaderTypedParams 类型化参数(DataRow)
/// <summary>
/// 执行指定连接数据库连接对象的存储过程,使用DataRow做为参数值,返回XmlReader类型的结果集.
/// </summary>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataRow"> 使用DataRow作为参数值 </param>
/// <returns> 返回XmlReader结果集对象. </returns>
public static XmlReader ExecuteXmlReaderTypedParams(SqlConnection connection, String spName, DataRow dataRow)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果row有值,存储过程必须初始化.
if (dataRow != null && dataRow.ItemArray.Length > 0 )
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
// 分配参数值
AssignParameterValues(commandParameters, dataRow);
return SqlHelper.ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return SqlHelper.ExecuteXmlReader(connection, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 执行指定连接数据库事务的存储过程,使用DataRow做为参数值,返回XmlReader类型的结果集.
/// </summary>
/// <param name="transaction"> 一个有效的连接事务 object </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="dataRow"> 使用DataRow作为参数值 </param>
/// <returns> 返回XmlReader结果集对象. </returns>
public static XmlReader ExecuteXmlReaderTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
{
if (transaction == null ) throw new ArgumentNullException( " transaction " );
if (transaction != null && transaction.Connection == null ) throw new ArgumentException( " The transaction was rollbacked or commited, please provide an open transaction. " , " transaction " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
// 如果row有值,存储过程必须初始化.
if (dataRow != null && dataRow.ItemArray.Length > 0 )
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
// 分配参数值
AssignParameterValues(commandParameters, dataRow);
return SqlHelper.ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return SqlHelper.ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName);
}
}
#endregion
}
/// <summary>
/// SqlHelperParameterCache提供缓存存储过程参数,并能够在运行时从存储过程中探索参数.
/// </summary>
public sealed class SqlHelperParameterCache
{
#region 私有方法,字段,构造函数
// 私有构造函数,妨止类被实例化.
private SqlHelperParameterCache() { }
// 这个方法要注意
private static Hashtable paramCache = Hashtable.Synchronized( new Hashtable());
/// <summary>
/// 探索运行时的存储过程,返回SqlParameter参数数组.
/// 初始化参数值为 DBNull.Value.
/// </summary>
/// <param name="connection"> 一个有效的数据库连接 </param>
/// <param name="spName"> 存储过程名称 </param>
/// <param name="includeReturnValueParameter"> 是否包含返回值参数 </param>
/// <returns> 返回SqlParameter参数数组 </returns>
private static SqlParameter[] DiscoverSpParameterSet(SqlConnection connection, string spName, bool includeReturnValueParameter)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
SqlCommand cmd = new SqlCommand(spName, connection);
cmd.CommandType = CommandType.StoredProcedure;
connection.Open();
// 检索cmd指定的存储过程的参数信息,并填充到cmd的Parameters参数集中.
SqlCommandBuilder.DeriveParameters(cmd);
connection.Close();
// 如果不包含返回值参数,将参数集中的每一个参数删除.
if ( ! includeReturnValueParameter)
{
cmd.Parameters.RemoveAt( 0 );
}
// 创建参数数组
SqlParameter[] discoveredParameters = new SqlParameter[cmd.Parameters.Count];
// 将cmd的Parameters参数集复制到discoveredParameters数组.
cmd.Parameters.CopyTo(discoveredParameters, 0 );
// 初始化参数值为 DBNull.Value.
foreach (SqlParameter discoveredParameter in discoveredParameters)
{
discoveredParameter.Value = DBNull.Value;
}
return discoveredParameters;
}
/// <summary>
/// SqlParameter参数数组的深层拷贝.
/// </summary>
/// <param name="originalParameters"> 原始参数数组 </param>
/// <returns> 返回一个同样的参数数组 </returns>
private static SqlParameter[] CloneParameters(SqlParameter[] originalParameters)
{
SqlParameter[] clonedParameters = new SqlParameter[originalParameters.Length];
for ( int i = 0 , j = originalParameters.Length; i < j; i ++ )
{
clonedParameters[i] = (SqlParameter)((ICloneable)originalParameters[i]).Clone();
}
return clonedParameters;
}
#endregion 私有方法,字段,构造函数结束
#region 缓存方法
/// <summary>
/// 追加参数数组到缓存.
/// </summary>
/// <param name="connectionString"> 一个有效的数据库连接字符串 </param>
/// <param name="commandText"> 存储过程名或SQL语句 </param>
/// <param name="commandParameters"> 要缓存的参数数组 </param>
public static void CacheParameterSet( string connectionString, string commandText, params SqlParameter[] commandParameters)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
if (commandText == null || commandText.Length == 0 ) throw new ArgumentNullException( " commandText " );
string hashKey = connectionString + " : " + commandText;
paramCache[hashKey] = commandParameters;
}
/// <summary>
/// 从缓存中获取参数数组.
/// </summary>
/// <param name="connectionString"> 一个有效的数据库连接字符 </param>
/// <param name="commandText"> 存储过程名或SQL语句 </param>
/// <returns> 参数数组 </returns>
public static SqlParameter[] GetCachedParameterSet( string connectionString, string commandText)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
if (commandText == null || commandText.Length == 0 ) throw new ArgumentNullException( " commandText " );
string hashKey = connectionString + " : " + commandText;
SqlParameter[] cachedParameters = paramCache[hashKey] as SqlParameter[];
if (cachedParameters == null )
{
return null ;
}
else
{
return CloneParameters(cachedParameters);
}
}
#endregion 缓存方法结束
#region 检索指定的存储过程的参数集
/// <summary>
/// 返回指定的存储过程的参数集
/// </summary>
/// <remarks>
/// 这个方法将查询数据库,并将信息存储到缓存.
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符 </param>
/// <param name="spName"> 存储过程名 </param>
/// <returns> 返回SqlParameter参数数组 </returns>
public static SqlParameter[] GetSpParameterSet( string connectionString, string spName)
{
return GetSpParameterSet(connectionString, spName, false );
}
/// <summary>
/// 返回指定的存储过程的参数集
/// </summary>
/// <remarks>
/// 这个方法将查询数据库,并将信息存储到缓存.
/// </remarks>
/// <param name="connectionString"> 一个有效的数据库连接字符. </param>
/// <param name="spName"> 存储过程名 </param>
/// <param name="includeReturnValueParameter"> 是否包含返回值参数 </param>
/// <returns> 返回SqlParameter参数数组 </returns>
public static SqlParameter[] GetSpParameterSet( string connectionString, string spName, bool includeReturnValueParameter)
{
if (connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( " connectionString " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
using (SqlConnection connection = new SqlConnection(connectionString))
{
return GetSpParameterSetInternal(connection, spName, includeReturnValueParameter);
}
}
/// <summary>
/// [内部]返回指定的存储过程的参数集(使用连接对象).
/// </summary>
/// <remarks>
/// 这个方法将查询数据库,并将信息存储到缓存.
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接字符 </param>
/// <param name="spName"> 存储过程名 </param>
/// <returns> 返回SqlParameter参数数组 </returns>
internal static SqlParameter[] GetSpParameterSet(SqlConnection connection, string spName)
{
return GetSpParameterSet(connection, spName, false );
}
/// <summary>
/// [内部]返回指定的存储过程的参数集(使用连接对象)
/// </summary>
/// <remarks>
/// 这个方法将查询数据库,并将信息存储到缓存.
/// </remarks>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="spName"> 存储过程名 </param>
/// <param name="includeReturnValueParameter">
/// 是否包含返回值参数
/// </param>
/// <returns> 返回SqlParameter参数数组 </returns>
internal static SqlParameter[] GetSpParameterSet(SqlConnection connection, string spName, bool includeReturnValueParameter)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
using (SqlConnection clonedConnection = (SqlConnection)((ICloneable)connection).Clone())
{
return GetSpParameterSetInternal(clonedConnection, spName, includeReturnValueParameter);
}
}
/// <summary>
/// [私有]返回指定的存储过程的参数集(使用连接对象)
/// </summary>
/// <param name="connection"> 一个有效的数据库连接对象 </param>
/// <param name="spName"> 存储过程名 </param>
/// <param name="includeReturnValueParameter"> 是否包含返回值参数 </param>
/// <returns> 返回SqlParameter参数数组 </returns>
private static SqlParameter[] GetSpParameterSetInternal(SqlConnection connection, string spName, bool includeReturnValueParameter)
{
if (connection == null ) throw new ArgumentNullException( " connection " );
if (spName == null || spName.Length == 0 ) throw new ArgumentNullException( " spName " );
string hashKey = connection.ConnectionString + " : " + spName + (includeReturnValueParameter ? " :include ReturnValue Parameter " : "" );
SqlParameter[] cachedParameters;
cachedParameters = paramCache[hashKey] as SqlParameter[];
if (cachedParameters == null )
{
SqlParameter[] spParameters = DiscoverSpParameterSet(connection, spName, includeReturnValueParameter);
paramCache[hashKey] = spParameters;
cachedParameters = spParameters;
}
return CloneParameters(cachedParameters);
}
#endregion 参数集检索结束
}