using System;
 using System.Data;
 using System.Xml;
 using System.Data.SqlClient;
 using System.Collections;
 using System.Configuration;

 //微软SQLHelper.cs类 中文版

 namespace Sales.DAL
 {
     /// <summary>
     /// SqlServer数据访问帮助类
     /// </summary>
     public sealed class SqlHelper
     {
         #region 私有构造函数和方法

         private SqlHelper() { }

         /// <summary>
         /// 将SqlParameter参数数组(参数值)分配给SqlCommand命令.
         /// 这个方法将给任何一个参数分配DBNull.Value;
         /// 该操作将阻止默认值的使用.
         /// </summary>
         /// <param name="command">命令名</param>
         /// <param name="commandParameters">SqlParameters数组</param>
         private static void AttachParameters(SqlCommand command, SqlParameter[] commandParameters)
         {
             if (command == null) throw new ArgumentNullException("command");
             if (commandParameters != null)
             {
                 foreach (SqlParameter p in commandParameters)
                 {
                     if (p != null)
                     {
                         // 检查未分配值的输出参数,将其分配以DBNull.Value.
                         if ((p.Direction == ParameterDirection.InputOutput || p.Direction == ParameterDirection.Input) &&
                             (p.Value == null))
                         {
                             p.Value = DBNull.Value;
                         }
                         command.Parameters.Add(p);
                     }
                 }
             }
         }

         /// <summary>
         /// 将DataRow类型的列值分配到SqlParameter参数数组.
         /// </summary>
         /// <param name="commandParameters">要分配值的SqlParameter参数数组</param>
         /// <param name="dataRow">将要分配给存储过程参数的DataRow</param>
         private static void AssignParameterValues(SqlParameter[] commandParameters, DataRow dataRow)
         {
             if ((commandParameters == null) || (dataRow == null))
             {
                 return;
             }

             ;
             // 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 <= )
                     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.
                 )) != -)
                     commandParameter.Value = dataRow[commandParameter.ParameterName.Substring()];
                 i++;
             }
         }

         /// <summary>
         /// 将一个对象数组分配给SqlParameter参数数组.
         /// </summary>
         /// <param name="commandParameters">要分配值的SqlParameter参数数组</param>
         /// <param name="parameterValues">将要分配给存储过程参数的对象数组</param>
         private static void AssignParameterValues(SqlParameter[] commandParameters, object[] parameterValues)
         {
             if ((commandParameters == null) || (parameterValues == null))
             {
                 return;
             }

             // 确保对象数组个数与参数个数匹配,如果不匹配,抛出一个异常.
             if (commandParameters.Length != parameterValues.Length)
             {
                 throw new ArgumentException("参数值个数与参数不匹配.");
             }

             // 给参数赋值
             , j = commandParameters.Length; i < j; i++)
             {
                 // If the current array value derives from IDbDataParameter, then assign its Value property
                 if (parameterValues[i] is IDbDataParameter)
                 {
                     IDbDataParameter paramInstance = (IDbDataParameter)parameterValues[i];
                     if (paramInstance.Value == null)
                     {
                         commandParameters[i].Value = DBNull.Value;
                     }
                     else
                     {
                         commandParameters[i].Value = paramInstance.Value;
                     }
                 }
                 else if (parameterValues[i] == null)
                 {
                     commandParameters[i].Value = DBNull.Value;
                 }
                 else
                 {
                     commandParameters[i].Value = parameterValues[i];
                 }
             }
         }

         /// <summary>
         /// 预处理用户提供的命令,数据库连接/事务/命令类型/参数
         /// </summary>
         /// <param name="command">要处理的SqlCommand</param>
         /// <param name="connection">数据库连接</param>
         /// <param name="transaction">一个有效的事务或者是null值</param>
         /// <param name="commandType">命令类型 (存储过程,命令文本, 其它.)</param>
         /// <param name="commandText">存储过程名或都T-SQL命令文本</param>
         /// <param name="commandParameters">和命令相关联的SqlParameter参数数组,如果没有参数为'null'</param>
         /// <param name="mustCloseConnection"><c>true</c> 如果连接是打开的,则为true,其它情况下为false.</param>
         private static void PrepareCommand(SqlCommand command, SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, out bool mustCloseConnection)
         {
             if (command == null) throw new ArgumentNullException("command");
             ) throw new ArgumentNullException("commandText");

             // If the provided connection is not open, we will open it
             if (connection.State != ConnectionState.Open)
             {
                 mustCloseConnection = true;
                 connection.Open();
             }
             else
             {
                 mustCloseConnection = false;
             }

             // 给命令分配一个数据库连接.
             command.Connection = connection;

             // 设置命令文本(存储过程名或SQL语句)
             command.CommandText = commandText;

             // 分配事务
             if (transaction != null)
             {
                 if (transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
                 command.Transaction = transaction;
             }

             // 设置命令类型.
             command.CommandType = commandType;

             // 分配命令参数
             if (commandParameters != null)
             {
                 AttachParameters(command, commandParameters);
             }
             return;
         }

         #endregion 私有构造函数和方法结束

         #region 数据库连接
         /// <summary>
         /// 一个有效的数据库连接字符串
         /// </summary>
         /// <returns></returns>
         public static string GetConnSting()
         {
             return ConfigurationManager.ConnectionStrings["ConStr"].ConnectionString;
         }
         /// <summary>
         /// 一个有效的数据库连接对象
         /// </summary>
         /// <returns></returns>
         public static SqlConnection GetConnection()
         {
             SqlConnection Connection = new SqlConnection(SqlHelper.GetConnSting());
             return Connection;
         }
         #endregion

         #region ExecuteNonQuery命令

         /// <summary>
         /// 执行指定连接字符串,类型的SqlCommand.
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders");
         /// </remarks>
         /// <param name="connectionString">一个有效的数据库连接字符串</param>
         /// <param name="commandType">命令类型 (存储过程,命令文本, 其它.)</param>
         /// <param name="commandText">存储过程名称或SQL语句</param>
         /// <returns>返回命令影响的行数</returns>
         public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText)
         {
             return ExecuteNonQuery(connectionString, commandType, commandText, (SqlParameter[])null);
         }

         /// <summary>
         /// 执行指定连接字符串,类型的SqlCommand.如果没有提供参数,不返回结果.
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="connectionString">一个有效的数据库连接字符串</param>
         /// <param name="commandType">命令类型 (存储过程,命令文本, 其它.)</param>
         /// <param name="commandText">存储过程名称或SQL语句</param>
         /// <param name="commandParameters">SqlParameter参数数组</param>
         /// <returns>返回命令影响的行数</returns>
         public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
         {
             ) throw new ArgumentNullException("connectionString");

             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 connection.Open();

                 return ExecuteNonQuery(connection, commandType, commandText, commandParameters);
             }
         }

         /// <summary>
         /// 执行指定连接字符串的存储过程,将对象数组的值赋给存储过程参数,
         /// 此方法需要在参数缓存方法中探索参数并生成参数.
         /// </summary>
         /// <remarks>
         /// 这个方法没有提供访问输出参数和返回值.
         /// 示例:
         ///  int result = ExecuteNonQuery(connString, "PublishOrders", 24, 36);
         /// </remarks>
         /// <param name="connectionString">一个有效的数据库连接字符串/param>
         /// <param name="spName">存储过程名称</param>
         /// <param name="parameterValues">分配到存储过程输入参数的对象数组</param>
         /// <returns>返回受影响的行数</returns>
         public static int ExecuteNonQuery(string connectionString, string spName, params object[] parameterValues)
         {
             ) throw new ArgumentNullException("connectionString");
             ) throw new ArgumentNullException("spName");

             // 如果存在参数值
             ))
             {
                 // 从探索存储过程参数(加载到缓存)并分配给存储过程参数数组.
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                 // 给存储过程参数赋值
                 AssignParameterValues(commandParameters, parameterValues);

                 return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 // 没有参数情况下
                 return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);
             }
         }

         /// <summary>
         /// 执行指定数据库连接对象的命令
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders");
         /// </remarks>
         /// <param name="connection">一个有效的数据库连接对象</param>
         /// <param name="commandType">命令类型(存储过程,命令文本或其它.)</param>
         /// <param name="commandText">存储过程名称或T-SQL语句</param>
         /// <returns>返回影响的行数</returns>
         public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText)
         {
             return ExecuteNonQuery(connection, commandType, commandText, (SqlParameter[])null);
         }

         /// <summary>
         /// 执行指定数据库连接对象的命令
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="connection">一个有效的数据库连接对象</param>
         /// <param name="commandType">命令类型(存储过程,命令文本或其它.)</param>
         /// <param name="commandText">T存储过程名称或T-SQL语句</param>
         /// <param name="commandParameters">SqlParamter参数数组</param>
         /// <returns>返回影响的行数</returns>
         public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
         {
             if (connection == null) throw new ArgumentNullException("connection");

             // 创建SqlCommand命令,并进行预处理
             SqlCommand cmd = new SqlCommand();
             bool mustCloseConnection = false;
             PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);

             // Finally, execute the command
             int retval = cmd.ExecuteNonQuery();

             // 清除参数,以便再次使用.
             cmd.Parameters.Clear();
             if (mustCloseConnection)
                 connection.Close();
             return retval;
         }

         /// <summary>
         /// 执行指定数据库连接对象的命令,将对象数组的值赋给存储过程参数.
         /// </summary>
         /// <remarks>
         /// 此方法不提供访问存储过程输出参数和返回值
         /// 示例:
         ///  int result = ExecuteNonQuery(conn, "PublishOrders", 24, 36);
         /// </remarks>
         /// <param name="connection">一个有效的数据库连接对象</param>
         /// <param name="spName">存储过程名</param>
         /// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>
         /// <returns>返回影响的行数</returns>
         public static int ExecuteNonQuery(SqlConnection connection, string spName, params object[] parameterValues)
         {
             if (connection == null) throw new ArgumentNullException("connection");
             ) throw new ArgumentNullException("spName");

             // 如果有参数值
             ))
             {
                 // 从缓存中加载存储过程参数
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                 // 给存储过程分配参数值
                 AssignParameterValues(commandParameters, parameterValues);

                 return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);
             }
         }

         /// <summary>
         /// 执行带事务的SqlCommand.
         /// </summary>
         /// <remarks>
         /// 示例.:
         ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders");
         /// </remarks>
         /// <param name="transaction">一个有效的数据库连接对象</param>
         /// <param name="commandType">命令类型(存储过程,命令文本或其它.)</param>
         /// <param name="commandText">存储过程名称或T-SQL语句</param>
         /// <returns>返回影响的行数/returns>
         public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText)
         {
             return ExecuteNonQuery(transaction, commandType, commandText, (SqlParameter[])null);
         }

         /// <summary>
         /// 执行带事务的SqlCommand(指定参数).
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="transaction">一个有效的数据库连接对象</param>
         /// <param name="commandType">命令类型(存储过程,命令文本或其它.)</param>
         /// <param name="commandText">存储过程名称或T-SQL语句</param>
         /// <param name="commandParameters">SqlParamter参数数组</param>
         /// <returns>返回影响的行数</returns>
         public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
         {
             if (transaction == null) throw new ArgumentNullException("transaction");
             if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

             // 预处理
             SqlCommand cmd = new SqlCommand();
             bool mustCloseConnection = false;
             PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

             // 执行
             int retval = cmd.ExecuteNonQuery();

             // 清除参数集,以便再次使用.
             cmd.Parameters.Clear();
             return retval;
         }

         /// <summary>
         /// 执行带事务的SqlCommand(指定参数值).
         /// </summary>
         /// <remarks>
         /// 此方法不提供访问存储过程输出参数和返回值
         /// 示例:
         ///  int result = ExecuteNonQuery(conn, trans, "PublishOrders", 24, 36);
         /// </remarks>
         /// <param name="transaction">一个有效的数据库连接对象</param>
         /// <param name="spName">存储过程名</param>
         /// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>
         /// <returns>返回受影响的行数</returns>
         public static int ExecuteNonQuery(SqlTransaction transaction, string spName, params object[] parameterValues)
         {
             if (transaction == null) throw new ArgumentNullException("transaction");
             if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
             ) throw new ArgumentNullException("spName");

             // 如果有参数值
             ))
             {
                 // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                 // 给存储过程参数赋值
                 AssignParameterValues(commandParameters, parameterValues);

                 // 调用重载方法
                 return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 // 没有参数值
                 return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);
             }
         }

         #endregion ExecuteNonQuery方法结束

         #region ExecuteDataset方法

         /// <summary>
         /// 执行指定数据库连接字符串的命令,返回DataSet.
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders");
         /// </remarks>
         /// <param name="connectionString">一个有效的数据库连接字符串</param>
         /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
         /// <param name="commandText">存储过程名称或T-SQL语句</param>
         /// <returns>返回一个包含结果集的DataSet</returns>
         public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText)
         {
             return ExecuteDataset(connectionString, commandType, commandText, (SqlParameter[])null);
         }

         /// <summary>
         /// 执行指定数据库连接字符串的命令,返回DataSet.
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="connectionString">一个有效的数据库连接字符串</param>
         /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
         /// <param name="commandText">存储过程名称或T-SQL语句</param>
         /// <param name="commandParameters">SqlParamters参数数组</param>
         /// <returns>返回一个包含结果集的DataSet</returns>
         public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
         {
             ) throw new ArgumentNullException("connectionString");

             // 创建并打开数据库连接对象,操作完成释放对象.
             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 connection.Open();

                 // 调用指定数据库连接字符串重载方法.
                 return ExecuteDataset(connection, commandType, commandText, commandParameters);
             }
         }

         /// <summary>
         /// 执行指定数据库连接字符串的命令,直接提供参数值,返回DataSet.
         /// </summary>
         /// <remarks>
         /// 此方法不提供访问存储过程输出参数和返回值.
         /// 示例:
         ///  DataSet ds = ExecuteDataset(connString, "GetOrders", 24, 36);
         /// </remarks>
         /// <param name="connectionString">一个有效的数据库连接字符串</param>
         /// <param name="spName">存储过程名</param>
         /// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>
         /// <returns>返回一个包含结果集的DataSet</returns>
         public static DataSet ExecuteDataset(string connectionString, string spName, params object[] parameterValues)
         {
             ) throw new ArgumentNullException("connectionString");
             ) throw new ArgumentNullException("spName");

             ))
             {
                 // 从缓存中检索存储过程参数
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                 // 给存储过程参数分配值
                 AssignParameterValues(commandParameters, parameterValues);

                 return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);
             }
         }

         /// <summary>
         /// 执行指定数据库连接对象的命令,返回DataSet.
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders");
         /// </remarks>
         /// <param name="connection">一个有效的数据库连接对象</param>
         /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
         /// <param name="commandText">存储过程名或T-SQL语句</param>
         /// <returns>返回一个包含结果集的DataSet</returns>
         public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText)
         {
             return ExecuteDataset(connection, commandType, commandText, (SqlParameter[])null);
         }

         /// <summary>
         /// 执行指定数据库连接对象的命令,指定存储过程参数,返回DataSet.
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="connection">一个有效的数据库连接对象</param>
         /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
         /// <param name="commandText">存储过程名或T-SQL语句</param>
         /// <param name="commandParameters">SqlParamter参数数组</param>
         /// <returns>返回一个包含结果集的DataSet</returns>
         public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
         {
             if (connection == null) throw new ArgumentNullException("connection");

             // 预处理
             SqlCommand cmd = new SqlCommand();
             bool mustCloseConnection = false;
             PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);

             // 创建SqlDataAdapter和DataSet.
             using (SqlDataAdapter da = new SqlDataAdapter(cmd))
             {
                 DataSet ds = new DataSet();

                 // 填充DataSet.
                 da.Fill(ds);

                 cmd.Parameters.Clear();

                 if (mustCloseConnection)
                     connection.Close();

                 return ds;
             }
         }

         /// <summary>
         /// 执行指定数据库连接对象的命令,指定参数值,返回DataSet.
         /// </summary>
         /// <remarks>
         /// 此方法不提供访问存储过程输入参数和返回值.
         /// 示例.:
         ///  DataSet ds = ExecuteDataset(conn, "GetOrders", 24, 36);
         /// </remarks>
         /// <param name="connection">一个有效的数据库连接对象</param>
         /// <param name="spName">存储过程名</param>
         /// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>
         /// <returns>返回一个包含结果集的DataSet</returns>
         public static DataSet ExecuteDataset(SqlConnection connection, string spName, params object[] parameterValues)
         {
             if (connection == null) throw new ArgumentNullException("connection");
             ) throw new ArgumentNullException("spName");

             ))
             {
                 // 比缓存中加载存储过程参数
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                 // 给存储过程参数分配值
                 AssignParameterValues(commandParameters, parameterValues);

                 return ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return ExecuteDataset(connection, CommandType.StoredProcedure, spName);
             }
         }

         /// <summary>
         /// 执行指定事务的命令,返回DataSet.
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders");
         /// </remarks>
         /// <param name="transaction">事务</param>
         /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
         /// <param name="commandText">存储过程名或T-SQL语句</param>
         /// <returns>返回一个包含结果集的DataSet</returns>
         public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText)
         {
             return ExecuteDataset(transaction, commandType, commandText, (SqlParameter[])null);
         }

         /// <summary>
         /// 执行指定事务的命令,指定参数,返回DataSet.
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="transaction">事务</param>
         /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
         /// <param name="commandText">存储过程名或T-SQL语句</param>
         /// <param name="commandParameters">SqlParamter参数数组</param>
         /// <returns>返回一个包含结果集的DataSet</returns>
         public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
         {
             if (transaction == null) throw new ArgumentNullException("transaction");
             if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

             // 预处理
             SqlCommand cmd = new SqlCommand();
             bool mustCloseConnection = false;
             PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

             // 创建 DataAdapter & DataSet
             using (SqlDataAdapter da = new SqlDataAdapter(cmd))
             {
                 DataSet ds = new DataSet();
                 da.Fill(ds);
                 cmd.Parameters.Clear();
                 return ds;
             }
         }

         /// <summary>
         /// 执行指定事务的命令,指定参数值,返回DataSet.
         /// </summary>
         /// <remarks>
         /// 此方法不提供访问存储过程输入参数和返回值.
         /// 示例.:
         ///  DataSet ds = ExecuteDataset(trans, "GetOrders", 24, 36);
         /// </remarks>
         /// <param name="transaction">事务</param>
         /// <param name="spName">存储过程名</param>
         /// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>
         /// <returns>返回一个包含结果集的DataSet</returns>
         public static DataSet ExecuteDataset(SqlTransaction transaction, string spName, params object[] parameterValues)
         {
             if (transaction == null) throw new ArgumentNullException("transaction");
             if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
             ) throw new ArgumentNullException("spName");

             ))
             {
                 // 从缓存中加载存储过程参数
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                 // 给存储过程参数分配值
                 AssignParameterValues(commandParameters, parameterValues);

                 return ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return ExecuteDataset(transaction, CommandType.StoredProcedure, spName);
             }
         }

         #endregion ExecuteDataset数据集命令结束

         #region ExecuteReader 数据阅读器

         /// <summary>
         /// 枚举,标识数据库连接是由SqlHelper提供还是由调用者提供
         /// </summary>
         private enum SqlConnectionOwnership
         {
             /// <summary>由SqlHelper提供连接</summary>
             Internal,
             /// <summary>由调用者提供连接</summary>
             External
         }

         /// <summary>
         /// 执行指定数据库连接对象的数据阅读器.
         /// </summary>
         /// <remarks>
         /// 如果是SqlHelper打开连接,当连接关闭DataReader也将关闭.
         /// 如果是调用都打开连接,DataReader由调用都管理.
         /// </remarks>
         /// <param name="connection">一个有效的数据库连接对象</param>
         /// <param name="transaction">一个有效的事务,或者为 'null'</param>
         /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
         /// <param name="commandText">存储过程名或T-SQL语句</param>
         /// <param name="commandParameters">SqlParameters参数数组,如果没有参数则为'null'</param>
         /// <param name="connectionOwnership">标识数据库连接对象是由调用者提供还是由SqlHelper提供</param>
         /// <returns>返回包含结果集的SqlDataReader</returns>
         private static SqlDataReader ExecuteReader(SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, SqlConnectionOwnership connectionOwnership)
         {
             if (connection == null) throw new ArgumentNullException("connection");

             bool mustCloseConnection = false;
             // 创建命令
             SqlCommand cmd = new SqlCommand();
             try
             {
                 PrepareCommand(cmd, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

                 // 创建数据阅读器
                 SqlDataReader dataReader;

                 if (connectionOwnership == SqlConnectionOwnership.External)
                 {
                     dataReader = cmd.ExecuteReader();
                 }
                 else
                 {
                     dataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                 }

                 // 清除参数,以便再次使用..
                 // HACK: There is a problem here, the output parameter values are fletched
                 // when the reader is closed, so if the parameters are detached from the command
                 // then the SqlReader can磘 set its values.
                 // When this happen, the parameters can磘 be used again in other command.
                 bool canClear = true;
                 foreach (SqlParameter commandParameter in cmd.Parameters)
                 {
                     if (commandParameter.Direction != ParameterDirection.Input)
                         canClear = false;
                 }

                 if (canClear)
                 {
                     cmd.Parameters.Clear();
                 }

                 return dataReader;
             }
             catch
             {
                 if (mustCloseConnection)
                     connection.Close();
                 throw;
             }
         }

         /// <summary>
         /// 执行指定数据库连接字符串的数据阅读器.
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders");
         /// </remarks>
         /// <param name="connectionString">一个有效的数据库连接字符串</param>
         /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
         /// <param name="commandText">存储过程名或T-SQL语句</param>
         /// <returns>返回包含结果集的SqlDataReader</returns>
         public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText)
         {
             return ExecuteReader(connectionString, commandType, commandText, (SqlParameter[])null);
         }

         /// <summary>
         /// 执行指定数据库连接字符串的数据阅读器,指定参数.
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="connectionString">一个有效的数据库连接字符串</param>
         /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
         /// <param name="commandText">存储过程名或T-SQL语句</param>
         /// <param name="commandParameters">SqlParamter参数数组(new SqlParameter("@prodid", 24))</param>
         /// <returns>返回包含结果集的SqlDataReader</returns>
         public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
         {
             ) throw new ArgumentNullException("connectionString");
             SqlConnection connection = null;
             try
             {
                 connection = new SqlConnection(connectionString);
                 connection.Open();

                 return ExecuteReader(connection, null, commandType, commandText, commandParameters, SqlConnectionOwnership.Internal);
             }
             catch
             {
                 // If we fail to return the SqlDatReader, we need to close the connection ourselves
                 if (connection != null) connection.Close();
                 throw;
             }

         }

         /// <summary>
         /// 执行指定数据库连接字符串的数据阅读器,指定参数值.
         /// </summary>
         /// <remarks>
         /// 此方法不提供访问存储过程输出参数和返回值参数.
         /// 示例:
         ///  SqlDataReader dr = ExecuteReader(connString, "GetOrders", 24, 36);
         /// </remarks>
         /// <param name="connectionString">一个有效的数据库连接字符串</param>
         /// <param name="spName">存储过程名</param>
         /// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>
         /// <returns>返回包含结果集的SqlDataReader</returns>
         public static SqlDataReader ExecuteReader(string connectionString, string spName, params object[] parameterValues)
         {
             ) throw new ArgumentNullException("connectionString");
             ) throw new ArgumentNullException("spName");

             ))
             {
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                 AssignParameterValues(commandParameters, parameterValues);

                 return ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return ExecuteReader(connectionString, CommandType.StoredProcedure, spName);
             }
         }

         /// <summary>
         /// 执行指定数据库连接对象的数据阅读器.
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders");
         /// </remarks>
         /// <param name="connection">一个有效的数据库连接对象</param>
         /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
         /// <param name="commandText">存储过程名或T-SQL语句</param>
         /// <returns>返回包含结果集的SqlDataReader</returns>
         public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText)
         {
             return ExecuteReader(connection, commandType, commandText, (SqlParameter[])null);
         }

         /// <summary>
         /// [调用者方式]执行指定数据库连接对象的数据阅读器,指定参数.
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="connection">一个有效的数据库连接对象</param>
         /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
         /// <param name="commandText">命令类型 (存储过程,命令文本或其它)</param>
         /// <param name="commandParameters">SqlParamter参数数组</param>
         /// <returns>返回包含结果集的SqlDataReader</returns>
         public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
         {
             return ExecuteReader(connection, (SqlTransaction)null, commandType, commandText, commandParameters, SqlConnectionOwnership.External);
         }

         /// <summary>
         /// [调用者方式]执行指定数据库连接对象的数据阅读器,指定参数值.
         /// </summary>
         /// <remarks>
         /// 此方法不提供访问存储过程输出参数和返回值参数.
         /// 示例:
         ///  SqlDataReader dr = ExecuteReader(conn, "GetOrders", 24, 36);
         /// </remarks>
         /// <param name="connection">一个有效的数据库连接对象</param>
         /// <param name="spName">T存储过程名</param>
         /// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>
         /// <returns>返回包含结果集的SqlDataReader</returns>
         public static SqlDataReader ExecuteReader(SqlConnection connection, string spName, params object[] parameterValues)
         {
             if (connection == null) throw new ArgumentNullException("connection");
             ) throw new ArgumentNullException("spName");

             ))
             {
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                 AssignParameterValues(commandParameters, parameterValues);

                 return ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return ExecuteReader(connection, CommandType.StoredProcedure, spName);
             }
         }

         /// <summary>
         /// [调用者方式]执行指定数据库事务的数据阅读器,指定参数值.
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders");
         /// </remarks>
         /// <param name="transaction">一个有效的连接事务</param>
         /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
         /// <param name="commandText">存储过程名称或T-SQL语句</param>
         /// <returns>返回包含结果集的SqlDataReader</returns>
         public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText)
         {
             return ExecuteReader(transaction, commandType, commandText, (SqlParameter[])null);
         }

         /// <summary>
         /// [调用者方式]执行指定数据库事务的数据阅读器,指定参数.
         /// </summary>
         /// <remarks>
         /// 示例:
         ///   SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="transaction">一个有效的连接事务</param>
         /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
         /// <param name="commandText">存储过程名称或T-SQL语句</param>
         /// <param name="commandParameters">分配给命令的SqlParamter参数数组</param>
         /// <returns>返回包含结果集的SqlDataReader</returns>
         public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
         {
             if (transaction == null) throw new ArgumentNullException("transaction");
             if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

             return ExecuteReader(transaction.Connection, transaction, commandType, commandText, commandParameters, SqlConnectionOwnership.External);
         }

         /// <summary>
         /// [调用者方式]执行指定数据库事务的数据阅读器,指定参数值.
         /// </summary>
         /// <remarks>
         /// 此方法不提供访问存储过程输出参数和返回值参数.
         ///
         /// 示例:
         ///  SqlDataReader dr = ExecuteReader(trans, "GetOrders", 24, 36);
         /// </remarks>
         /// <param name="transaction">一个有效的连接事务</param>
         /// <param name="spName">存储过程名称</param>
         /// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>
         /// <returns>返回包含结果集的SqlDataReader</returns>
         public static SqlDataReader ExecuteReader(SqlTransaction transaction, string spName, params object[] parameterValues)
         {
             if (transaction == null) throw new ArgumentNullException("transaction");
             if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
             ) throw new ArgumentNullException("spName");

             // 如果有参数值
             ))
             {
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                 AssignParameterValues(commandParameters, parameterValues);

                 return ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 // 没有参数值
                 return ExecuteReader(transaction, CommandType.StoredProcedure, spName);
             }
         }

         #endregion ExecuteReader数据阅读器

         #region ExecuteScalar 返回结果集中的第一行第一列

         /// <summary>
         /// 执行指定数据库连接字符串的命令,返回结果集中的第一行第一列.
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount");
         /// </remarks>
         /// <param name="connectionString">一个有效的数据库连接字符串</param>
         /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
         /// <param name="commandText">存储过程名称或T-SQL语句</param>
         /// <returns>返回结果集中的第一行第一列</returns>
         public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText)
         {
             // 执行参数为空的方法
             return ExecuteScalar(connectionString, commandType, commandText, (SqlParameter[])null);
         }

         /// <summary>
         /// 执行指定数据库连接字符串的命令,指定参数,返回结果集中的第一行第一列.
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="connectionString">一个有效的数据库连接字符串</param>
         /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
         /// <param name="commandText">存储过程名称或T-SQL语句</param>
         /// <param name="commandParameters">分配给命令的SqlParamter参数数组</param>
         /// <returns>返回结果集中的第一行第一列</returns>
         public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
         {
             ) throw new ArgumentNullException("connectionString");
             // 创建并打开数据库连接对象,操作完成释放对象.
             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 connection.Open();

                 // 调用指定数据库连接字符串重载方法.
                 return ExecuteScalar(connection, commandType, commandText, commandParameters);
             }
         }

         /// <summary>
         /// 执行指定数据库连接字符串的命令,指定参数值,返回结果集中的第一行第一列.
         /// </summary>
         /// <remarks>
         /// 此方法不提供访问存储过程输出参数和返回值参数.
         ///
         /// 示例:
         ///  int orderCount = (int)ExecuteScalar(connString, "GetOrderCount", 24, 36);
         /// </remarks>
         /// <param name="connectionString">一个有效的数据库连接字符串</param>
         /// <param name="spName">存储过程名称</param>
         /// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>
         /// <returns>返回结果集中的第一行第一列</returns>
         public static object ExecuteScalar(string connectionString, string spName, params object[] parameterValues)
         {
             ) throw new ArgumentNullException("connectionString");
             ) throw new ArgumentNullException("spName");

             // 如果有参数值
             ))
             {
                 // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                 // 给存储过程参数赋值
                 AssignParameterValues(commandParameters, parameterValues);

                 // 调用重载方法
                 return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 // 没有参数值
                 return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);
             }
         }

         /// <summary>
         /// 执行指定数据库连接对象的命令,返回结果集中的第一行第一列.
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount");
         /// </remarks>
         /// <param name="connection">一个有效的数据库连接对象</param>
         /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
         /// <param name="commandText">存储过程名称或T-SQL语句</param>
         /// <returns>返回结果集中的第一行第一列</returns>
         public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText)
         {
             // 执行参数为空的方法
             return ExecuteScalar(connection, commandType, commandText, (SqlParameter[])null);
         }

         /// <summary>
         /// 执行指定数据库连接对象的命令,指定参数,返回结果集中的第一行第一列.
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="connection">一个有效的数据库连接对象</param>
         /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
         /// <param name="commandText">存储过程名称或T-SQL语句</param>
         /// <param name="commandParameters">分配给命令的SqlParamter参数数组</param>
         /// <returns>返回结果集中的第一行第一列</returns>
         public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
         {
             if (connection == null) throw new ArgumentNullException("connection");

             // 创建SqlCommand命令,并进行预处理
             SqlCommand cmd = new SqlCommand();

             bool mustCloseConnection = false;
             PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);

             // 执行SqlCommand命令,并返回结果.
             object retval = cmd.ExecuteScalar();

             // 清除参数,以便再次使用.
             cmd.Parameters.Clear();

             if (mustCloseConnection)
                 connection.Close();

             return retval;
         }

         /// <summary>
         /// 执行指定数据库连接对象的命令,指定参数值,返回结果集中的第一行第一列.
         /// </summary>
         /// <remarks>
         /// 此方法不提供访问存储过程输出参数和返回值参数.
         ///
         /// 示例:
         ///  int orderCount = (int)ExecuteScalar(conn, "GetOrderCount", 24, 36);
         /// </remarks>
         /// <param name="connection">一个有效的数据库连接对象</param>
         /// <param name="spName">存储过程名称</param>
         /// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>
         /// <returns>返回结果集中的第一行第一列</returns>
         public static object ExecuteScalar(SqlConnection connection, string spName, params object[] parameterValues)
         {
             if (connection == null) throw new ArgumentNullException("connection");
             ) throw new ArgumentNullException("spName");

             // 如果有参数值
             ))
             {
                 // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                 // 给存储过程参数赋值
                 AssignParameterValues(commandParameters, parameterValues);

                 // 调用重载方法
                 return ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 // 没有参数值
                 return ExecuteScalar(connection, CommandType.StoredProcedure, spName);
             }
         }

         /// <summary>
         /// 执行指定数据库事务的命令,返回结果集中的第一行第一列.
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount");
         /// </remarks>
         /// <param name="transaction">一个有效的连接事务</param>
         /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
         /// <param name="commandText">存储过程名称或T-SQL语句</param>
         /// <returns>返回结果集中的第一行第一列</returns>
         public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText)
         {
             // 执行参数为空的方法
             return ExecuteScalar(transaction, commandType, commandText, (SqlParameter[])null);
         }

         /// <summary>
         /// 执行指定数据库事务的命令,指定参数,返回结果集中的第一行第一列.
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="transaction">一个有效的连接事务</param>
         /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
         /// <param name="commandText">存储过程名称或T-SQL语句</param>
         /// <param name="commandParameters">分配给命令的SqlParamter参数数组</param>
         /// <returns>返回结果集中的第一行第一列</returns>
         public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
         {
             if (transaction == null) throw new ArgumentNullException("transaction");
             if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

             // 创建SqlCommand命令,并进行预处理
             SqlCommand cmd = new SqlCommand();
             bool mustCloseConnection = false;
             PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

             // 执行SqlCommand命令,并返回结果.
             object retval = cmd.ExecuteScalar();

             // 清除参数,以便再次使用.
             cmd.Parameters.Clear();
             return retval;
         }

         /// <summary>
         /// 执行指定数据库事务的命令,指定参数值,返回结果集中的第一行第一列.
         /// </summary>
         /// <remarks>
         /// 此方法不提供访问存储过程输出参数和返回值参数.
         ///
         /// 示例:
         ///  int orderCount = (int)ExecuteScalar(trans, "GetOrderCount", 24, 36);
         /// </remarks>
         /// <param name="transaction">一个有效的连接事务</param>
         /// <param name="spName">存储过程名称</param>
         /// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>
         /// <returns>返回结果集中的第一行第一列</returns>
         public static object ExecuteScalar(SqlTransaction transaction, string spName, params object[] parameterValues)
         {
             if (transaction == null) throw new ArgumentNullException("transaction");
             if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
             ) throw new ArgumentNullException("spName");

             // 如果有参数值
             ))
             {
                 // PPull the parameters for this stored procedure from the parameter cache ()
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                 // 给存储过程参数赋值
                 AssignParameterValues(commandParameters, parameterValues);

                 // 调用重载方法
                 return ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 // 没有参数值
                 return ExecuteScalar(transaction, CommandType.StoredProcedure, spName);
             }
         }

         #endregion ExecuteScalar

         #region ExecuteXmlReader XML阅读器
         /// <summary>
         /// 执行指定数据库连接对象的SqlCommand命令,并产生一个XmlReader对象做为结果集返回.
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders");
         /// </remarks>
         /// <param name="connection">一个有效的数据库连接对象</param>
         /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
         /// <param name="commandText">存储过程名称或T-SQL语句 using "FOR XML AUTO"</param>
         /// <returns>返回XmlReader结果集对象.</returns>
         public static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText)
         {
             // 执行参数为空的方法
             return ExecuteXmlReader(connection, commandType, commandText, (SqlParameter[])null);
         }

         /// <summary>
         /// 执行指定数据库连接对象的SqlCommand命令,并产生一个XmlReader对象做为结果集返回,指定参数.
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="connection">一个有效的数据库连接对象</param>
         /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
         /// <param name="commandText">存储过程名称或T-SQL语句 using "FOR XML AUTO"</param>
         /// <param name="commandParameters">分配给命令的SqlParamter参数数组</param>
         /// <returns>返回XmlReader结果集对象.</returns>
         public static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
         {
             if (connection == null) throw new ArgumentNullException("connection");

             bool mustCloseConnection = false;
             // 创建SqlCommand命令,并进行预处理
             SqlCommand cmd = new SqlCommand();
             try
             {
                 PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);

                 // 执行命令
                 XmlReader retval = cmd.ExecuteXmlReader();

                 // 清除参数,以便再次使用.
                 cmd.Parameters.Clear();

                 return retval;
             }
             catch
             {
                 if (mustCloseConnection)
                     connection.Close();
                 throw;
             }
         }

         /// <summary>
         /// 执行指定数据库连接对象的SqlCommand命令,并产生一个XmlReader对象做为结果集返回,指定参数值.
         /// </summary>
         /// <remarks>
         /// 此方法不提供访问存储过程输出参数和返回值参数.
         ///
         /// 示例:
         ///  XmlReader r = ExecuteXmlReader(conn, "GetOrders", 24, 36);
         /// </remarks>
         /// <param name="connection">一个有效的数据库连接对象</param>
         /// <param name="spName">存储过程名称 using "FOR XML AUTO"</param>
         /// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>
         /// <returns>返回XmlReader结果集对象.</returns>
         public static XmlReader ExecuteXmlReader(SqlConnection connection, string spName, params object[] parameterValues)
         {
             if (connection == null) throw new ArgumentNullException("connection");
             ) throw new ArgumentNullException("spName");

             // 如果有参数值
             ))
             {
                 // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                 // 给存储过程参数赋值
                 AssignParameterValues(commandParameters, parameterValues);

                 // 调用重载方法
                 return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 // 没有参数值
                 return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName);
             }
         }

         /// <summary>
         /// 执行指定数据库事务的SqlCommand命令,并产生一个XmlReader对象做为结果集返回.
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders");
         /// </remarks>
         /// <param name="transaction">一个有效的连接事务</param>
         /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
         /// <param name="commandText">存储过程名称或T-SQL语句 using "FOR XML AUTO"</param>
         /// <returns>返回XmlReader结果集对象.</returns>
         public static XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText)
         {
             // 执行参数为空的方法
             return ExecuteXmlReader(transaction, commandType, commandText, (SqlParameter[])null);
         }

         /// <summary>
         /// 执行指定数据库事务的SqlCommand命令,并产生一个XmlReader对象做为结果集返回,指定参数.
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="transaction">一个有效的连接事务</param>
         /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
         /// <param name="commandText">存储过程名称或T-SQL语句 using "FOR XML AUTO"</param>
         /// <param name="commandParameters">分配给命令的SqlParamter参数数组</param>
         /// <returns>返回XmlReader结果集对象.</returns>
         public static XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
         {
             if (transaction == null) throw new ArgumentNullException("transaction");
             if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

             // 创建SqlCommand命令,并进行预处理
             SqlCommand cmd = new SqlCommand();
             bool mustCloseConnection = false;
             PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

             // 执行命令
             XmlReader retval = cmd.ExecuteXmlReader();

             // 清除参数,以便再次使用.
             cmd.Parameters.Clear();
             return retval;
         }

         /// <summary>
         /// 执行指定数据库事务的SqlCommand命令,并产生一个XmlReader对象做为结果集返回,指定参数值.
         /// </summary>
         /// <remarks>
         /// 此方法不提供访问存储过程输出参数和返回值参数.
         ///
         /// 示例:
         ///  XmlReader r = ExecuteXmlReader(trans, "GetOrders", 24, 36);
         /// </remarks>
         /// <param name="transaction">一个有效的连接事务</param>
         /// <param name="spName">存储过程名称</param>
         /// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>
         /// <returns>返回一个包含结果集的DataSet.</returns>
         public static XmlReader ExecuteXmlReader(SqlTransaction transaction, string spName, params object[] parameterValues)
         {
             if (transaction == null) throw new ArgumentNullException("transaction");
             if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
             ) throw new ArgumentNullException("spName");

             // 如果有参数值
             ))
             {
                 // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                 // 给存储过程参数赋值
                 AssignParameterValues(commandParameters, parameterValues);

                 // 调用重载方法
                 return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 // 没有参数值
                 return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName);
             }
         }

         #endregion ExecuteXmlReader 阅读器结束

         #region FillDataset 填充数据集
         /// <summary>
         /// 执行指定数据库连接字符串的命令,映射数据表并填充数据集.
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
         /// </remarks>
         /// <param name="connectionString">一个有效的数据库连接字符串</param>
         /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
         /// <param name="commandText">存储过程名称或T-SQL语句</param>
         /// <param name="dataSet">要填充结果集的DataSet实例</param>
         /// <param name="tableNames">表映射的数据表数组
         /// 用户定义的表名 (可有是实际的表名.)</param>
         public static void FillDataset(string connectionString, CommandType commandType, string commandText, DataSet dataSet, string[] tableNames)
         {
             ) throw new ArgumentNullException("connectionString");
             if (dataSet == null) throw new ArgumentNullException("dataSet");

             // 创建并打开数据库连接对象,操作完成释放对象.
             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 connection.Open();

                 // 调用指定数据库连接字符串重载方法.
                 FillDataset(connection, commandType, commandText, dataSet, tableNames);
             }
         }

         /// <summary>
         /// 执行指定数据库连接字符串的命令,映射数据表并填充数据集.指定命令参数.
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="connectionString">一个有效的数据库连接字符串</param>
         /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
         /// <param name="commandText">存储过程名称或T-SQL语句</param>
         /// <param name="commandParameters">分配给命令的SqlParamter参数数组</param>
         /// <param name="dataSet">要填充结果集的DataSet实例</param>
         /// <param name="tableNames">表映射的数据表数组
         /// 用户定义的表名 (可有是实际的表名.)
         /// </param>
         public static void FillDataset(string connectionString, CommandType commandType,
             string commandText, DataSet dataSet, string[] tableNames,
             params SqlParameter[] commandParameters)
         {
             ) throw new ArgumentNullException("connectionString");
             if (dataSet == null) throw new ArgumentNullException("dataSet");
             // 创建并打开数据库连接对象,操作完成释放对象.
             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 connection.Open();

                 // 调用指定数据库连接字符串重载方法.
                 FillDataset(connection, commandType, commandText, dataSet, tableNames, commandParameters);
             }
         }

         /// <summary>
         /// 执行指定数据库连接字符串的命令,映射数据表并填充数据集,指定存储过程参数值.
         /// </summary>
         /// <remarks>
         /// 此方法不提供访问存储过程输出参数和返回值参数.
         ///
         /// 示例:
         ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, 24);
         /// </remarks>
         /// <param name="connectionString">一个有效的数据库连接字符串</param>
         /// <param name="spName">存储过程名称</param>
         /// <param name="dataSet">要填充结果集的DataSet实例</param>
         /// <param name="tableNames">表映射的数据表数组
         /// 用户定义的表名 (可有是实际的表名.)
         /// </param>
         /// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>
         public static void FillDataset(string connectionString, string spName,
             DataSet dataSet, string[] tableNames,
             params object[] parameterValues)
         {
             ) throw new ArgumentNullException("connectionString");
             if (dataSet == null) throw new ArgumentNullException("dataSet");
             // 创建并打开数据库连接对象,操作完成释放对象.
             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 connection.Open();

                 // 调用指定数据库连接字符串重载方法.
                 FillDataset(connection, spName, dataSet, tableNames, parameterValues);
             }
         }

         /// <summary>
         /// 执行指定数据库连接对象的命令,映射数据表并填充数据集.
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
         /// </remarks>
         /// <param name="connection">一个有效的数据库连接对象</param>
         /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
         /// <param name="commandText">存储过程名称或T-SQL语句</param>
         /// <param name="dataSet">要填充结果集的DataSet实例</param>
         /// <param name="tableNames">表映射的数据表数组
         /// 用户定义的表名 (可有是实际的表名.)
         /// </param>
         public static void FillDataset(SqlConnection connection, CommandType commandType,
             string commandText, DataSet dataSet, string[] tableNames)
         {
             FillDataset(connection, commandType, commandText, dataSet, tableNames, null);
         }

         /// <summary>
         /// 执行指定数据库连接对象的命令,映射数据表并填充数据集,指定参数.
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="connection">一个有效的数据库连接对象</param>
         /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
         /// <param name="commandText">存储过程名称或T-SQL语句</param>
         /// <param name="dataSet">要填充结果集的DataSet实例</param>
         /// <param name="tableNames">表映射的数据表数组
         /// 用户定义的表名 (可有是实际的表名.)
         /// </param>
         /// <param name="commandParameters">分配给命令的SqlParamter参数数组</param>
         public static void FillDataset(SqlConnection connection, CommandType commandType,
             string commandText, DataSet dataSet, string[] tableNames,
             params SqlParameter[] commandParameters)
         {
             FillDataset(connection, null, commandType, commandText, dataSet, tableNames, commandParameters);
         }

         /// <summary>
         /// 执行指定数据库连接对象的命令,映射数据表并填充数据集,指定存储过程参数值.
         /// </summary>
         /// <remarks>
         /// 此方法不提供访问存储过程输出参数和返回值参数.
         ///
         /// 示例:
         ///  FillDataset(conn, "GetOrders", ds, new string[] {"orders"}, 24, 36);
         /// </remarks>
         /// <param name="connection">一个有效的数据库连接对象</param>
         /// <param name="spName">存储过程名称</param>
         /// <param name="dataSet">要填充结果集的DataSet实例</param>
         /// <param name="tableNames">表映射的数据表数组
         /// 用户定义的表名 (可有是实际的表名.)
         /// </param>
         /// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>
         public static void FillDataset(SqlConnection connection, string spName,
             DataSet dataSet, string[] tableNames,
             params object[] parameterValues)
         {
             if (connection == null) throw new ArgumentNullException("connection");
             if (dataSet == null) throw new ArgumentNullException("dataSet");
             ) throw new ArgumentNullException("spName");

             // 如果有参数值
             ))
             {
                 // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                 // 给存储过程参数赋值
                 AssignParameterValues(commandParameters, parameterValues);

                 // 调用重载方法
                 FillDataset(connection, CommandType.StoredProcedure, spName, dataSet, tableNames, commandParameters);
             }
             else
             {
                 // 没有参数值
                 FillDataset(connection, CommandType.StoredProcedure, spName, dataSet, tableNames);
             }
         }

         /// <summary>
         /// 执行指定数据库事务的命令,映射数据表并填充数据集.
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
         /// </remarks>
         /// <param name="transaction">一个有效的连接事务</param>
         /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
         /// <param name="commandText">存储过程名称或T-SQL语句</param>
         /// <param name="dataSet">要填充结果集的DataSet实例</param>
         /// <param name="tableNames">表映射的数据表数组
         /// 用户定义的表名 (可有是实际的表名.)
         /// </param>
         public static void FillDataset(SqlTransaction transaction, CommandType commandType,
             string commandText,
             DataSet dataSet, string[] tableNames)
         {
             FillDataset(transaction, commandType, commandText, dataSet, tableNames, null);
         }

         /// <summary>
         /// 执行指定数据库事务的命令,映射数据表并填充数据集,指定参数.
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="transaction">一个有效的连接事务</param>
         /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
         /// <param name="commandText">存储过程名称或T-SQL语句</param>
         /// <param name="dataSet">要填充结果集的DataSet实例</param>
         /// <param name="tableNames">表映射的数据表数组
         /// 用户定义的表名 (可有是实际的表名.)
         /// </param>
         /// <param name="commandParameters">分配给命令的SqlParamter参数数组</param>
         public static void FillDataset(SqlTransaction transaction, CommandType commandType,
             string commandText, DataSet dataSet, string[] tableNames,
             params SqlParameter[] commandParameters)
         {
             FillDataset(transaction.Connection, transaction, commandType, commandText, dataSet, tableNames, commandParameters);
         }

         /// <summary>
         /// 执行指定数据库事务的命令,映射数据表并填充数据集,指定存储过程参数值.
         /// </summary>
         /// <remarks>
         /// 此方法不提供访问存储过程输出参数和返回值参数.
         ///
         /// 示例:
         ///  FillDataset(trans, "GetOrders", ds, new string[]{"orders"}, 24, 36);
         /// </remarks>
         /// <param name="transaction">一个有效的连接事务</param>
         /// <param name="spName">存储过程名称</param>
         /// <param name="dataSet">要填充结果集的DataSet实例</param>
         /// <param name="tableNames">表映射的数据表数组
         /// 用户定义的表名 (可有是实际的表名.)
         /// </param>
         /// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>
         public static void FillDataset(SqlTransaction transaction, string spName,
             DataSet dataSet, string[] tableNames,
             params object[] parameterValues)
         {
             if (transaction == null) throw new ArgumentNullException("transaction");
             if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
             if (dataSet == null) throw new ArgumentNullException("dataSet");
             ) throw new ArgumentNullException("spName");

             // 如果有参数值
             ))
             {
                 // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                 // 给存储过程参数赋值
                 AssignParameterValues(commandParameters, parameterValues);

                 // 调用重载方法
                 FillDataset(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames, commandParameters);
             }
             else
             {
                 // 没有参数值
                 FillDataset(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames);
             }
         }

         /// <summary>
         /// [私有方法][内部调用]执行指定数据库连接对象/事务的命令,映射数据表并填充数据集,DataSet/TableNames/SqlParameters.
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  FillDataset(conn, trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
         /// </remarks>
         /// <param name="connection">一个有效的数据库连接对象</param>
         /// <param name="transaction">一个有效的连接事务</param>
         /// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
         /// <param name="commandText">存储过程名称或T-SQL语句</param>
         /// <param name="dataSet">要填充结果集的DataSet实例</param>
         /// <param name="tableNames">表映射的数据表数组
         /// 用户定义的表名 (可有是实际的表名.)
         /// </param>
         /// <param name="commandParameters">分配给命令的SqlParamter参数数组</param>
         private static void FillDataset(SqlConnection connection, SqlTransaction transaction, CommandType commandType,
             string commandText, DataSet dataSet, string[] tableNames,
             params SqlParameter[] commandParameters)
         {
             if (connection == null) throw new ArgumentNullException("connection");
             if (dataSet == null) throw new ArgumentNullException("dataSet");

             // 创建SqlCommand命令,并进行预处理
             SqlCommand command = new SqlCommand();
             bool mustCloseConnection = false;
             PrepareCommand(command, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

             // 执行命令
             using (SqlDataAdapter dataAdapter = new SqlDataAdapter(command))
             {

                 // 追加表映射
                 )
                 {
                     string tableName = "Table";
                     ; index < tableNames.Length; index++)
                     {
                         ) 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 + ).ToString();
                     }
                 }

                 // 填充数据集使用默认表名称
                 dataAdapter.Fill(dataSet);

                 // 清除参数,以便再次使用.
                 command.Parameters.Clear();
             }

             if (mustCloseConnection)
                 connection.Close();
         }
         #endregion

         #region UpdateDataset 更新数据集
         /// <summary>
         /// 执行数据集更新到数据库,指定inserted, updated, or deleted命令.
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  UpdateDataset(conn, insertCommand, deleteCommand, updateCommand, dataSet, "Order");
         /// </remarks>
         /// <param name="insertCommand">[追加记录]一个有效的T-SQL语句或存储过程</param>
         /// <param name="deleteCommand">[删除记录]一个有效的T-SQL语句或存储过程</param>
         /// <param name="updateCommand">[更新记录]一个有效的T-SQL语句或存储过程</param>
         /// <param name="dataSet">要更新到数据库的DataSet</param>
         /// <param name="tableName">要更新到数据库的DataTable</param>
         public static void UpdateDataset(SqlCommand insertCommand, SqlCommand deleteCommand, SqlCommand updateCommand, DataSet dataSet, string tableName)
         {
             if (insertCommand == null) throw new ArgumentNullException("insertCommand");
             if (deleteCommand == null) throw new ArgumentNullException("deleteCommand");
             if (updateCommand == null) throw new ArgumentNullException("updateCommand");
             ) throw new ArgumentNullException("tableName");

             // 创建SqlDataAdapter,当操作完成后释放.
             using (SqlDataAdapter dataAdapter = new SqlDataAdapter())
             {
                 // 设置数据适配器命令
                 dataAdapter.UpdateCommand = updateCommand;
                 dataAdapter.InsertCommand = insertCommand;
                 dataAdapter.DeleteCommand = deleteCommand;

                 // 更新数据集改变到数据库
                 dataAdapter.Update(dataSet, tableName);

                 // 提交所有改变到数据集.
                 dataSet.AcceptChanges();
             }
         }
         #endregion

         #region CreateCommand 创建一条SqlCommand命令
         /// <summary>
         /// 创建SqlCommand命令,指定数据库连接对象,存储过程名和参数.
         /// </summary>
         /// <remarks>
         /// 示例:
         ///  SqlCommand command = CreateCommand(conn, "AddCustomer", "CustomerID", "CustomerName");
         /// </remarks>
         /// <param name="connection">一个有效的数据库连接对象</param>
         /// <param name="spName">存储过程名称</param>
         /// <param name="sourceColumns">源表的列名称数组</param>
         /// <returns>返回SqlCommand命令</returns>
         public static SqlCommand CreateCommand(SqlConnection connection, string spName, params string[] sourceColumns)
         {
             if (connection == null) throw new ArgumentNullException("connection");
             ) throw new ArgumentNullException("spName");

             // 创建命令
             SqlCommand cmd = new SqlCommand(spName, connection);
             cmd.CommandType = CommandType.StoredProcedure;

             // 如果有参数值
             ))
             {
                 // 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.
                 ; index < sourceColumns.Length; index++)
                     commandParameters[index].SourceColumn = sourceColumns[index];

                 // Attach the discovered parameters to the SqlCommand object
                 AttachParameters(cmd, commandParameters);
             }

             return cmd;
         }
         #endregion

         #region ExecuteNonQueryTypedParams 类型化参数(DataRow)
         /// <summary>
         /// 执行指定连接数据库连接字符串的存储过程,使用DataRow做为参数值,返回受影响的行数.
         /// </summary>
         /// <param name="connectionString">一个有效的数据库连接字符串</param>
         /// <param name="spName">存储过程名称</param>
         /// <param name="dataRow">使用DataRow作为参数值</param>
         /// <returns>返回影响的行数</returns>
         public static int ExecuteNonQueryTypedParams(String connectionString, String spName, DataRow dataRow)
         {
             ) throw new ArgumentNullException("connectionString");
             ) throw new ArgumentNullException("spName");

             // 如果row有值,存储过程必须初始化.
             )
             {
                 // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                 // 分配参数值
                 AssignParameterValues(commandParameters, dataRow);

                 return SqlHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return SqlHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);
             }
         }

         /// <summary>
         /// 执行指定连接数据库连接对象的存储过程,使用DataRow做为参数值,返回受影响的行数.
         /// </summary>
         /// <param name="connection">一个有效的数据库连接对象</param>
         /// <param name="spName">存储过程名称</param>
         /// <param name="dataRow">使用DataRow作为参数值</param>
         /// <returns>返回影响的行数</returns>
         public static int ExecuteNonQueryTypedParams(SqlConnection connection, String spName, DataRow dataRow)
         {
             if (connection == null) throw new ArgumentNullException("connection");
             ) throw new ArgumentNullException("spName");

             // 如果row有值,存储过程必须初始化.
             )
             {
                 // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                 // 分配参数值
                 AssignParameterValues(commandParameters, dataRow);

                 return SqlHelper.ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return SqlHelper.ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);
             }
         }

         /// <summary>
         /// 执行指定连接数据库事物的存储过程,使用DataRow做为参数值,返回受影响的行数.
         /// </summary>
         /// <param name="transaction">一个有效的连接事务 object</param>
         /// <param name="spName">存储过程名称</param>
         /// <param name="dataRow">使用DataRow作为参数值</param>
         /// <returns>返回影响的行数</returns>
         public static int ExecuteNonQueryTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
         {
             if (transaction == null) throw new ArgumentNullException("transaction");
             if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
             ) throw new ArgumentNullException("spName");

             // Sf the row has values, the store procedure parameters must be initialized
             )
             {
                 // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                 // 分配参数值
                 AssignParameterValues(commandParameters, dataRow);

                 return SqlHelper.ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return SqlHelper.ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);
             }
         }
         #endregion

         #region ExecuteDatasetTypedParams 类型化参数(DataRow)
         /// <summary>
         /// 执行指定连接数据库连接字符串的存储过程,使用DataRow做为参数值,返回DataSet.
         /// </summary>
         /// <param name="connectionString">一个有效的数据库连接字符串</param>
         /// <param name="spName">存储过程名称</param>
         /// <param name="dataRow">使用DataRow作为参数值</param>
         /// <returns>返回一个包含结果集的DataSet.</returns>
         public static DataSet ExecuteDatasetTypedParams(string connectionString, String spName, DataRow dataRow)
         {
             ) throw new ArgumentNullException("connectionString");
             ) throw new ArgumentNullException("spName");

             //如果row有值,存储过程必须初始化.
             )
             {
                 // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                 // 分配参数值
                 AssignParameterValues(commandParameters, dataRow);

                 return SqlHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return SqlHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);
             }
         }

         /// <summary>
         /// 执行指定连接数据库连接对象的存储过程,使用DataRow做为参数值,返回DataSet.
         /// </summary>
         /// <param name="connection">一个有效的数据库连接对象</param>
         /// <param name="spName">存储过程名称</param>
         /// <param name="dataRow">使用DataRow作为参数值</param>
         /// <returns>返回一个包含结果集的DataSet.</returns>
         ///
         public static DataSet ExecuteDatasetTypedParams(SqlConnection connection, String spName, DataRow dataRow)
         {
             if (connection == null) throw new ArgumentNullException("connection");
             ) throw new ArgumentNullException("spName");

             // 如果row有值,存储过程必须初始化.
             )
             {
                 // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                 // 分配参数值
                 AssignParameterValues(commandParameters, dataRow);

                 return SqlHelper.ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return SqlHelper.ExecuteDataset(connection, CommandType.StoredProcedure, spName);
             }
         }

         /// <summary>
         /// 执行指定连接数据库事务的存储过程,使用DataRow做为参数值,返回DataSet.
         /// </summary>
         /// <param name="transaction">一个有效的连接事务 object</param>
         /// <param name="spName">存储过程名称</param>
         /// <param name="dataRow">使用DataRow作为参数值</param>
         /// <returns>返回一个包含结果集的DataSet.</returns>
         public static DataSet ExecuteDatasetTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
         {
             if (transaction == null) throw new ArgumentNullException("transaction");
             if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
             ) throw new ArgumentNullException("spName");

             // 如果row有值,存储过程必须初始化.
             )
             {
                 // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                 // 分配参数值
                 AssignParameterValues(commandParameters, dataRow);

                 return SqlHelper.ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return SqlHelper.ExecuteDataset(transaction, CommandType.StoredProcedure, spName);
             }
         }

         #endregion

         #region ExecuteReaderTypedParams 类型化参数(DataRow)
         /// <summary>
         /// 执行指定连接数据库连接字符串的存储过程,使用DataRow做为参数值,返回DataReader.
         /// </summary>
         /// <param name="connectionString">一个有效的数据库连接字符串</param>
         /// <param name="spName">存储过程名称</param>
         /// <param name="dataRow">使用DataRow作为参数值</param>
         /// <returns>返回包含结果集的SqlDataReader</returns>
         public static SqlDataReader ExecuteReaderTypedParams(String connectionString, String spName, DataRow dataRow)
         {
             ) throw new ArgumentNullException("connectionString");
             ) throw new ArgumentNullException("spName");

             // 如果row有值,存储过程必须初始化.
             )
             {
                 // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                 // 分配参数值
                 AssignParameterValues(commandParameters, dataRow);

                 return SqlHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return SqlHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, spName);
             }
         }

         /// <summary>
         /// 执行指定连接数据库连接对象的存储过程,使用DataRow做为参数值,返回DataReader.
         /// </summary>
         /// <param name="connection">一个有效的数据库连接对象</param>
         /// <param name="spName">存储过程名称</param>
         /// <param name="dataRow">使用DataRow作为参数值</param>
         /// <returns>返回包含结果集的SqlDataReader</returns>
         public static SqlDataReader ExecuteReaderTypedParams(SqlConnection connection, String spName, DataRow dataRow)
         {
             if (connection == null) throw new ArgumentNullException("connection");
             ) throw new ArgumentNullException("spName");

             // 如果row有值,存储过程必须初始化.
             )
             {
                 // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                 // 分配参数值
                 AssignParameterValues(commandParameters, dataRow);

                 return SqlHelper.ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return SqlHelper.ExecuteReader(connection, CommandType.StoredProcedure, spName);
             }
         }

         /// <summary>
         /// 执行指定连接数据库事物的存储过程,使用DataRow做为参数值,返回DataReader.
         /// </summary>
         /// <param name="transaction">一个有效的连接事务 object</param>
         /// <param name="spName">存储过程名称</param>
         /// <param name="dataRow">使用DataRow作为参数值</param>
         /// <returns>返回包含结果集的SqlDataReader</returns>
         public static SqlDataReader ExecuteReaderTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
         {
             if (transaction == null) throw new ArgumentNullException("transaction");
             if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
             ) throw new ArgumentNullException("spName");

             // 如果row有值,存储过程必须初始化.
             )
             {
                 // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                 // 分配参数值
                 AssignParameterValues(commandParameters, dataRow);

                 return SqlHelper.ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return SqlHelper.ExecuteReader(transaction, CommandType.StoredProcedure, spName);
             }
         }
         #endregion

         #region ExecuteScalarTypedParams 类型化参数(DataRow)
         /// <summary>
         /// 执行指定连接数据库连接字符串的存储过程,使用DataRow做为参数值,返回结果集中的第一行第一列.
         /// </summary>
         /// <param name="connectionString">一个有效的数据库连接字符串</param>
         /// <param name="spName">存储过程名称</param>
         /// <param name="dataRow">使用DataRow作为参数值</param>
         /// <returns>返回结果集中的第一行第一列</returns>
         public static object ExecuteScalarTypedParams(String connectionString, String spName, DataRow dataRow)
         {
             ) throw new ArgumentNullException("connectionString");
             ) throw new ArgumentNullException("spName");

             // 如果row有值,存储过程必须初始化.
             )
             {
                 // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                 // 分配参数值
                 AssignParameterValues(commandParameters, dataRow);

                 return SqlHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return SqlHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);
             }
         }

         /// <summary>
         /// 执行指定连接数据库连接对象的存储过程,使用DataRow做为参数值,返回结果集中的第一行第一列.
         /// </summary>
         /// <param name="connection">一个有效的数据库连接对象</param>
         /// <param name="spName">存储过程名称</param>
         /// <param name="dataRow">使用DataRow作为参数值</param>
         /// <returns>返回结果集中的第一行第一列</returns>
         public static object ExecuteScalarTypedParams(SqlConnection connection, String spName, DataRow dataRow)
         {
             if (connection == null) throw new ArgumentNullException("connection");
             ) throw new ArgumentNullException("spName");

             // 如果row有值,存储过程必须初始化.
             )
             {
                 // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                 // 分配参数值
                 AssignParameterValues(commandParameters, dataRow);

                 return SqlHelper.ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return SqlHelper.ExecuteScalar(connection, CommandType.StoredProcedure, spName);
             }
         }

         /// <summary>
         /// 执行指定连接数据库事务的存储过程,使用DataRow做为参数值,返回结果集中的第一行第一列.
         /// </summary>
         /// <param name="transaction">一个有效的连接事务 object</param>
         /// <param name="spName">存储过程名称</param>
         /// <param name="dataRow">使用DataRow作为参数值</param>
         /// <returns>返回结果集中的第一行第一列</returns>
         public static object ExecuteScalarTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
         {
             if (transaction == null) throw new ArgumentNullException("transaction");
             if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
             ) throw new ArgumentNullException("spName");

             // 如果row有值,存储过程必须初始化.
             )
             {
                 // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                 // 分配参数值
                 AssignParameterValues(commandParameters, dataRow);

                 return SqlHelper.ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return SqlHelper.ExecuteScalar(transaction, CommandType.StoredProcedure, spName);
             }
         }
         #endregion

         #region ExecuteXmlReaderTypedParams 类型化参数(DataRow)
         /// <summary>
         /// 执行指定连接数据库连接对象的存储过程,使用DataRow做为参数值,返回XmlReader类型的结果集.
         /// </summary>
         /// <param name="connection">一个有效的数据库连接对象</param>
         /// <param name="spName">存储过程名称</param>
         /// <param name="dataRow">使用DataRow作为参数值</param>
         /// <returns>返回XmlReader结果集对象.</returns>
         public static XmlReader ExecuteXmlReaderTypedParams(SqlConnection connection, String spName, DataRow dataRow)
         {
             if (connection == null) throw new ArgumentNullException("connection");
             ) throw new ArgumentNullException("spName");

             // 如果row有值,存储过程必须初始化.
             )
             {
                 // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                 // 分配参数值
                 AssignParameterValues(commandParameters, dataRow);

                 return SqlHelper.ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return SqlHelper.ExecuteXmlReader(connection, CommandType.StoredProcedure, spName);
             }
         }

         /// <summary>
         /// 执行指定连接数据库事务的存储过程,使用DataRow做为参数值,返回XmlReader类型的结果集.
         /// </summary>
         /// <param name="transaction">一个有效的连接事务 object</param>
         /// <param name="spName">存储过程名称</param>
         /// <param name="dataRow">使用DataRow作为参数值</param>
         /// <returns>返回XmlReader结果集对象.</returns>
         public static XmlReader ExecuteXmlReaderTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
         {
             if (transaction == null) throw new ArgumentNullException("transaction");
             if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
             ) throw new ArgumentNullException("spName");

             // 如果row有值,存储过程必须初始化.
             )
             {
                 // 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
                 SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                 // 分配参数值
                 AssignParameterValues(commandParameters, dataRow);

                 return SqlHelper.ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
             }
             else
             {
                 return SqlHelper.ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName);
             }
         }
         #endregion

     }

     /// <summary>
     /// SqlHelperParameterCache提供缓存存储过程参数,并能够在运行时从存储过程中探索参数.
     /// </summary>
     public sealed class SqlHelperParameterCache
     {
         #region 私有方法,字段,构造函数
         // 私有构造函数,妨止类被实例化.
         private SqlHelperParameterCache() { }

         // 这个方法要注意
         private static Hashtable paramCache = Hashtable.Synchronized(new Hashtable());

         /// <summary>
         /// 探索运行时的存储过程,返回SqlParameter参数数组.
         /// 初始化参数值为 DBNull.Value.
         /// </summary>
         /// <param name="connection">一个有效的数据库连接</param>
         /// <param name="spName">存储过程名称</param>
         /// <param name="includeReturnValueParameter">是否包含返回值参数</param>
         /// <returns>返回SqlParameter参数数组</returns>
         private static SqlParameter[] DiscoverSpParameterSet(SqlConnection connection, string spName, bool includeReturnValueParameter)
         {
             if (connection == null) throw new ArgumentNullException("connection");
             ) 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();
             }

             // 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, );

             // 初始化参数值为 DBNull.Value.
             foreach (SqlParameter discoveredParameter in discoveredParameters)
             {
                 discoveredParameter.Value = DBNull.Value;
             }
             return discoveredParameters;
         }

         /// <summary>
         /// SqlParameter参数数组的深层拷贝.
         /// </summary>
         /// <param name="originalParameters">原始参数数组</param>
         /// <returns>返回一个同样的参数数组</returns>
         private static SqlParameter[] CloneParameters(SqlParameter[] originalParameters)
         {
             SqlParameter[] clonedParameters = new SqlParameter[originalParameters.Length];

             , j = originalParameters.Length; i < j; i++)
             {
                 clonedParameters[i] = (SqlParameter)((ICloneable)originalParameters[i]).Clone();
             }

             return clonedParameters;
         }

         #endregion 私有方法,字段,构造函数结束

         #region 缓存方法

         /// <summary>
         /// 追加参数数组到缓存.
         /// </summary>
         /// <param name="connectionString">一个有效的数据库连接字符串</param>
         /// <param name="commandText">存储过程名或SQL语句</param>
         /// <param name="commandParameters">要缓存的参数数组</param>
         public static void CacheParameterSet(string connectionString, string commandText, params SqlParameter[] commandParameters)
         {
             ) throw new ArgumentNullException("connectionString");
             ) throw new ArgumentNullException("commandText");

             string hashKey = connectionString + ":" + commandText;

             paramCache[hashKey] = commandParameters;
         }

         /// <summary>
         /// 从缓存中获取参数数组.
         /// </summary>
         /// <param name="connectionString">一个有效的数据库连接字符</param>
         /// <param name="commandText">存储过程名或SQL语句</param>
         /// <returns>参数数组</returns>
         public static SqlParameter[] GetCachedParameterSet(string connectionString, string commandText)
         {
             ) throw new ArgumentNullException("connectionString");
             ) throw new ArgumentNullException("commandText");

             string hashKey = connectionString + ":" + commandText;

             SqlParameter[] cachedParameters = paramCache[hashKey] as SqlParameter[];
             if (cachedParameters == null)
             {
                 return null;
             }
             else
             {
                 return CloneParameters(cachedParameters);
             }
         }

         #endregion 缓存方法结束

         #region 检索指定的存储过程的参数集

         /// <summary>
         /// 返回指定的存储过程的参数集
         /// </summary>
         /// <remarks>
         /// 这个方法将查询数据库,并将信息存储到缓存.
         /// </remarks>
         /// <param name="connectionString">一个有效的数据库连接字符</param>
         /// <param name="spName">存储过程名</param>
         /// <returns>返回SqlParameter参数数组</returns>
         public static SqlParameter[] GetSpParameterSet(string connectionString, string spName)
         {
             return GetSpParameterSet(connectionString, spName, false);
         }

         /// <summary>
         /// 返回指定的存储过程的参数集
         /// </summary>
         /// <remarks>
         /// 这个方法将查询数据库,并将信息存储到缓存.
         /// </remarks>
         /// <param name="connectionString">一个有效的数据库连接字符.</param>
         /// <param name="spName">存储过程名</param>
         /// <param name="includeReturnValueParameter">是否包含返回值参数</param>
         /// <returns>返回SqlParameter参数数组</returns>
         public static SqlParameter[] GetSpParameterSet(string connectionString, string spName, bool includeReturnValueParameter)
         {
             ) throw new ArgumentNullException("connectionString");
             ) throw new ArgumentNullException("spName");

             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 return GetSpParameterSetInternal(connection, spName, includeReturnValueParameter);
             }
         }

         /// <summary>
         /// [内部]返回指定的存储过程的参数集(使用连接对象).
         /// </summary>
         /// <remarks>
         /// 这个方法将查询数据库,并将信息存储到缓存.
         /// </remarks>
         /// <param name="connection">一个有效的数据库连接字符</param>
         /// <param name="spName">存储过程名</param>
         /// <returns>返回SqlParameter参数数组</returns>
         internal static SqlParameter[] GetSpParameterSet(SqlConnection connection, string spName)
         {
             return GetSpParameterSet(connection, spName, false);
         }

         /// <summary>
         /// [内部]返回指定的存储过程的参数集(使用连接对象)
         /// </summary>
         /// <remarks>
         /// 这个方法将查询数据库,并将信息存储到缓存.
         /// </remarks>
         /// <param name="connection">一个有效的数据库连接对象</param>
         /// <param name="spName">存储过程名</param>
         /// <param name="includeReturnValueParameter">
         /// 是否包含返回值参数
         /// </param>
         /// <returns>返回SqlParameter参数数组</returns>
         internal static SqlParameter[] GetSpParameterSet(SqlConnection connection, string spName, bool includeReturnValueParameter)
         {
             if (connection == null) throw new ArgumentNullException("connection");
             using (SqlConnection clonedConnection = (SqlConnection)((ICloneable)connection).Clone())
             {
                 return GetSpParameterSetInternal(clonedConnection, spName, includeReturnValueParameter);
             }
         }

         /// <summary>
         /// [私有]返回指定的存储过程的参数集(使用连接对象)
         /// </summary>
         /// <param name="connection">一个有效的数据库连接对象</param>
         /// <param name="spName">存储过程名</param>
         /// <param name="includeReturnValueParameter">是否包含返回值参数</param>
         /// <returns>返回SqlParameter参数数组</returns>
         private static SqlParameter[] GetSpParameterSetInternal(SqlConnection connection, string spName, bool includeReturnValueParameter)
         {
             if (connection == null) throw new ArgumentNullException("connection");
             ) 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

     }
 }

 //如果要获取连接数据连接对象或字符串的话,先要修改SQLHelper类中GetConnSting() 方法中的ConfigurationManager.ConnectionStrings["ConStr"].ConnectionString;才能调用。

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