using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
using System.Data;
using System.Xml;
using System.Collections;

namespace BLWWS_BLL
{
    /// <summary>
    /// SqlServer数据访问帮助类
    /// </summary>
    public sealed class SqlHelper
    {
        /// <summary>
        /// 数据库连接字符串
        /// </summary>
        public static readonly string connectionString = System.Configuration.ConfigurationManager.AppSettings["connectionString"];

        #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
    }
}
 
