开发常用工具类-未完整
1.SqlHelper
using System; using System.Data; using System.Xml; using System.Data.SqlClient; using System.Collections; using System.Configuration; using System.Collections.Specialized; /********************************************| * SQLHelper数据访问工具类 | ********************************************/ namespace Demo1 { /// <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 数据库连接 /// <summary> /// 一个有效的数据库连接字符串 ///</summary> /// <returns></returns> public static string GetConnSting() { string ab = string.Empty; return ConfigurationManager.AppSettings["ConnStr"]; //NameValueCollection nodeName = (NameValueCollection)ConfigurationManager.GetSection("databaseSettings"); //if (nodeName["connectionString"] == null || nodeName["connectionString"] == "") //{ // return string.Empty; //} //else //{ // return nodeName["connectionString"]; //} //return "server=.,2008;database=gms;uid=sa;pwd=123456;"; //return ConfigurationManager.ConnectionStrings["ConStr"].ConnectionString; } /// <summary> /// 一个有效的数据库连接对象 ///</summary> /// <returns></returns> public static SqlConnection GetConnection() { SqlConnection Connection = new SqlConnection(SqlHelper.GetConnSting()); return Connection; } #endregion #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"); /// 主要用在insert,update,delete ///</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) {
2.HtmlHelper
3.ConfigHelper
4.StringHelper
5.RegexHelper
6.IpHelper
7.MailHelper
8.YZMHelper
9.SerializeHelper
10.