微软的SQLHelper类(含完整中文注释)

using System;



using System.Data;



using System.Xml;



using System.Data.SqlClient;



using System.Collections;



namespace Book.DAL



{



    /// <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>命令名</param>



        /// <param>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>要分配值的SqlParameter参数数组</param>



        /// <param>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>要分配值的SqlParameter参数数组</param>



        /// <param>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>要处理的SqlCommand</param>



        /// <param>数据库连接</param>



        /// <param>一个有效的事务或者是null值</param>



        /// <param>命令类型 (存储过程,命令文本, 其它.)</param>



        /// <param>存储过程名或都T-SQL命令文本</param>



        /// <param>和命令相关联的SqlParameter参数数组,如果没有参数为'null'</param>



        /// <param><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>一个有效的数据库连接字符串</param>



        /// <param>命令类型 (存储过程,命令文本, 其它.)</param>



        /// <param>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>一个有效的数据库连接字符串</param>



        /// <param>命令类型 (存储过程,命令文本, 其它.)</param>



        /// <param>存储过程名称或SQL语句</param>



        /// <param>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>一个有效的数据库连接字符串/param>



        /// <param>存储过程名称</param>



        /// <param>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>一个有效的数据库连接对象</param>



        /// <param>命令类型(存储过程,命令文本或其它.)</param>



        /// <param>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>一个有效的数据库连接对象</param>



        /// <param>命令类型(存储过程,命令文本或其它.)</param>



        /// <param>T存储过程名称或T-SQL语句</param>



        /// <param>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>一个有效的数据库连接对象</param>



        /// <param>存储过程名</param>



        /// <param>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>一个有效的数据库连接对象</param>



        /// <param>命令类型(存储过程,命令文本或其它.)</param>



        /// <param>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>一个有效的数据库连接对象</param>



        /// <param>命令类型(存储过程,命令文本或其它.)</param>



        /// <param>存储过程名称或T-SQL语句</param>



        /// <param>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>一个有效的数据库连接对象</param>



        /// <param>存储过程名</param>



        /// <param>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>一个有效的数据库连接字符串</param>



        /// <param>命令类型 (存储过程,命令文本或其它)</param>



        /// <param>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>一个有效的数据库连接字符串</param>



        /// <param>命令类型 (存储过程,命令文本或其它)</param>



        /// <param>存储过程名称或T-SQL语句</param>



        /// <param>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>一个有效的数据库连接字符串</param>



        /// <param>存储过程名</param>



        /// <param>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>一个有效的数据库连接对象</param>



        /// <param>命令类型 (存储过程,命令文本或其它)</param>



        /// <param>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>一个有效的数据库连接对象</param>



        /// <param>命令类型 (存储过程,命令文本或其它)</param>



        /// <param>存储过程名或T-SQL语句</param>



        /// <param>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>一个有效的数据库连接对象</param>



        /// <param>存储过程名</param>



        /// <param>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>事务</param>



        /// <param>命令类型 (存储过程,命令文本或其它)</param>



        /// <param>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>事务</param>



        /// <param>命令类型 (存储过程,命令文本或其它)</param>



        /// <param>存储过程名或T-SQL语句</param>



        /// <param>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>事务</param>



        /// <param>存储过程名</param>



        /// <param>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>一个有效的数据库连接对象</param>



        /// <param>一个有效的事务,或者为 'null'</param>



        /// <param>命令类型 (存储过程,命令文本或其它)</param>



        /// <param>存储过程名或T-SQL语句</param>



        /// <param>SqlParameters参数数组,如果没有参数则为'null'</param>



        /// <param>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>一个有效的数据库连接字符串</param>



        /// <param>命令类型 (存储过程,命令文本或其它)</param>



        /// <param>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>一个有效的数据库连接字符串</param>



        /// <param>命令类型 (存储过程,命令文本或其它)</param>



        /// <param>存储过程名或T-SQL语句</param>



        /// <param>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>一个有效的数据库连接字符串</param>



        /// <param>存储过程名</param>



        /// <param>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>一个有效的数据库连接对象</param>



        /// <param>命令类型 (存储过程,命令文本或其它)</param>



        /// <param>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>一个有效的数据库连接对象</param>



        /// <param>命令类型 (存储过程,命令文本或其它)</param>



        /// <param>命令类型 (存储过程,命令文本或其它)</param>



        /// <param>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>一个有效的数据库连接对象</param>



        /// <param>T存储过程名</param>



        /// <param>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>一个有效的连接事务</param>



        /// <param>命令类型 (存储过程,命令文本或其它)</param>



        /// <param>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>一个有效的连接事务</param>



        /// <param>命令类型 (存储过程,命令文本或其它)</param>



        /// <param>存储过程名称或T-SQL语句</param>



        /// <param>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>一个有效的连接事务</param>



        /// <param>存储过程名称</param>



        /// <param>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>一个有效的数据库连接字符串</param>



        /// <param>命令类型 (存储过程,命令文本或其它)</param>



        /// <param>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>一个有效的数据库连接字符串</param>



        /// <param>命令类型 (存储过程,命令文本或其它)</param>



        /// <param>存储过程名称或T-SQL语句</param>



        /// <param>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>一个有效的数据库连接字符串</param>



        /// <param>存储过程名称</param>



        /// <param>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>一个有效的数据库连接对象</param>



        /// <param>命令类型 (存储过程,命令文本或其它)</param>



        /// <param>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>一个有效的数据库连接对象</param>



        /// <param>命令类型 (存储过程,命令文本或其它)</param>



        /// <param>存储过程名称或T-SQL语句</param>



        /// <param>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>一个有效的数据库连接对象</param>



        /// <param>存储过程名称</param>



        /// <param>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>一个有效的连接事务</param>



        /// <param>命令类型 (存储过程,命令文本或其它)</param>



        /// <param>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>一个有效的连接事务</param>



        /// <param>命令类型 (存储过程,命令文本或其它)</param>



        /// <param>存储过程名称或T-SQL语句</param>



        /// <param>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>一个有效的连接事务</param>



        /// <param>存储过程名称</param>



        /// <param>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>一个有效的数据库连接对象</param>



        /// <param>命令类型 (存储过程,命令文本或其它)</param>



        /// <param>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>一个有效的数据库连接对象</param>



        /// <param>命令类型 (存储过程,命令文本或其它)</param>



        /// <param>存储过程名称或T-SQL语句 using "FOR XML AUTO"</param>



        /// <param>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>一个有效的数据库连接对象</param>



        /// <param>存储过程名称 using "FOR XML AUTO"</param>



        /// <param>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>一个有效的连接事务</param>



        /// <param>命令类型 (存储过程,命令文本或其它)</param>



        /// <param>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>一个有效的连接事务</param>



        /// <param>命令类型 (存储过程,命令文本或其它)</param>



        /// <param>存储过程名称或T-SQL语句 using "FOR XML AUTO"</param>



        /// <param>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>一个有效的连接事务</param>



        /// <param>存储过程名称</param>



        /// <param>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>一个有效的数据库连接字符串</param>



        /// <param>命令类型 (存储过程,命令文本或其它)</param>



        /// <param>存储过程名称或T-SQL语句</param>



        /// <param>要填充结果集的DataSet实例</param>



        /// <param>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>一个有效的数据库连接字符串</param>



        /// <param>命令类型 (存储过程,命令文本或其它)</param>



        /// <param>存储过程名称或T-SQL语句</param>



        /// <param>分配给命令的SqlParamter参数数组</param>



        /// <param>要填充结果集的DataSet实例</param>



        /// <param>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>一个有效的数据库连接字符串</param>



        /// <param>存储过程名称</param>



        /// <param>要填充结果集的DataSet实例</param>



        /// <param>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>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>一个有效的数据库连接对象</param>



        /// <param>命令类型 (存储过程,命令文本或其它)</param>



        /// <param>存储过程名称或T-SQL语句</param>



        /// <param>要填充结果集的DataSet实例</param>



        /// <param>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>一个有效的数据库连接对象</param>



        /// <param>命令类型 (存储过程,命令文本或其它)</param>



        /// <param>存储过程名称或T-SQL语句</param>



        /// <param>要填充结果集的DataSet实例</param>



        /// <param>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>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>一个有效的数据库连接对象</param>



        /// <param>存储过程名称</param>



        /// <param>要填充结果集的DataSet实例</param>



        /// <param>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>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>一个有效的连接事务</param>



        /// <param>命令类型 (存储过程,命令文本或其它)</param>



        /// <param>存储过程名称或T-SQL语句</param>



        /// <param>要填充结果集的DataSet实例</param>



        /// <param>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>一个有效的连接事务</param>



        /// <param>命令类型 (存储过程,命令文本或其它)</param>



        /// <param>存储过程名称或T-SQL语句</param>



        /// <param>要填充结果集的DataSet实例</param>



        /// <param>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>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>一个有效的连接事务</param>



        /// <param>存储过程名称</param>



        /// <param>要填充结果集的DataSet实例</param>



        /// <param>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>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>一个有效的数据库连接对象</param>



        /// <param>一个有效的连接事务</param>



        /// <param>命令类型 (存储过程,命令文本或其它)</param>



        /// <param>存储过程名称或T-SQL语句</param>



        /// <param>要填充结果集的DataSet实例</param>



        /// <param>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>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>[追加记录]一个有效的T-SQL语句或存储过程</param>



        /// <param>[删除记录]一个有效的T-SQL语句或存储过程</param>



        /// <param>[更新记录]一个有效的T-SQL语句或存储过程</param>



        /// <param>要更新到数据库的DataSet</param>



        /// <param>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>一个有效的数据库连接对象</param>



        /// <param>存储过程名称</param>



        /// <param>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>一个有效的数据库连接字符串</param>



        /// <param>存储过程名称</param>



        /// <param>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>一个有效的数据库连接对象</param>



        /// <param>存储过程名称</param>



        /// <param>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>一个有效的连接事务 object</param>



        /// <param>存储过程名称</param>



        /// <param>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>一个有效的数据库连接字符串</param>



        /// <param>存储过程名称</param>



        /// <param>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>一个有效的数据库连接对象</param>



        /// <param>存储过程名称</param>



        /// <param>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>一个有效的连接事务 object</param>



        /// <param>存储过程名称</param>



        /// <param>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>一个有效的数据库连接字符串</param>



        /// <param>存储过程名称</param>



        /// <param>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>一个有效的数据库连接对象</param>



        /// <param>存储过程名称</param>



        /// <param>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>一个有效的连接事务 object</param>



        /// <param>存储过程名称</param>



        /// <param>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>一个有效的数据库连接字符串</param>



        /// <param>存储过程名称</param>



        /// <param>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>一个有效的数据库连接对象</param>



        /// <param>存储过程名称</param>



        /// <param>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>一个有效的连接事务 object</param>



        /// <param>存储过程名称</param>



        /// <param>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>一个有效的数据库连接对象</param>



        /// <param>存储过程名称</param>



        /// <param>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>一个有效的连接事务 object</param>



        /// <param>存储过程名称</param>



        /// <param>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>一个有效的数据库连接</param>



        /// <param>存储过程名称</param>



        /// <param>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>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>一个有效的数据库连接字符串</param>



        /// <param>存储过程名或SQL语句</param>



        /// <param>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>一个有效的数据库连接字符</param>



        /// <param>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>一个有效的数据库连接字符</param>



        /// <param>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>一个有效的数据库连接字符.</param>



        /// <param>存储过程名</param>



        /// <param>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>一个有效的数据库连接字符</param>



        /// <param>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>一个有效的数据库连接对象</param>



        /// <param>存储过程名</param>



        /// <param>



        /// 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>一个有效的数据库连接对象</param>



        /// <param>存储过程名</param>



        /// <param>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



    }



}



你可能感兴趣的:(help)