SQLHelper.cs类微软C#版

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

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

private SqlHelper() { }

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

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

int i = 0;
// 设置参数值
foreach (SqlParameter commandParameter in commandParameters)
{
// 创建参数名称,如果不存在,只抛出一个异常.
if (commandParameter.ParameterName == null ||
commandParameter.ParameterName.Length <= 1)
throw new Exception(
string.Format("请提供参数{0}一个有效的名称{1}.", i, commandParameter.ParameterName));
// 从dataRow的表中获取为参数数组中数组名称的列的索引.
// 如果存在和参数名称相同的列,则将列值赋给当前名称的参数.
if (dataRow.Table.Columns.IndexOf(commandParameter.ParameterName.Substring(1)) != -1)
commandParameter.Value = dataRow[commandParameter.ParameterName.Substring(1)];
i++;
}
}

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

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

// 给参数赋值
for (int i = 0, j = commandParameters.Length; i < j; i++)
{
// If the current array value derives from IDbDataParameter, then assign its Value property
if (parameterValues[i] is IDbDataParameter)
{
IDbDataParameter paramInstance = (IDbDataParameter)parameterValues[i];
if (paramInstance.Value == null)
{
commandParameters[i].Value = DBNull.Value;
}
else
{
commandParameters[i].Value = paramInstance.Value;
}
}
else if (parameterValues[i] == null)
{
commandParameters[i].Value = DBNull.Value;
}
else
{
commandParameters[i].Value = parameterValues[i];
}
}
}

/// <summary>
/// 预处理用户提供的命令,数据库连接/事务/命令类型/参数
/// </summary>
/// <param name="command">要处理的SqlCommand</param>
/// <param name="connection">数据库连接</param>
/// <param name="transaction">一个有效的事务或者是null值</param>
/// <param name="commandType">命令类型 (存储过程,命令文本, 其它.)</param>
/// <param name="commandText">存储过程名或都T-SQL命令文本</param>
/// <param name="commandParameters">和命令相关联的SqlParameter参数数组,如果没有参数为'null'</param>
/// <param name="mustCloseConnection"><c>true</c> 如果连接是打开的,则为true,其它情况下为false.</param>
private static void PrepareCommand(SqlCommand command, SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, out bool mustCloseConnection)
{
if (command == null) throw new ArgumentNullException("command");
if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText");

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

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

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

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

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

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

#endregion 私有构造函数和方法结束

#region 数据库连接
/// <summary>
/// 一个有效的数据库连接字符串
/// </summary>
/// <returns></returns>
public static string GetConnSting()
{
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)
{
if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");

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

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

/// <summary>
/// 执行指定连接字符串的存储过程,将对象数组的值赋给存储过程参数,
/// 此方法需要在参数缓存方法中探索参数并生成参数.
/// </summary>
/// <remarks>
/// 这个方法没有提供访问输出参数和返回值.
/// 示例:
/// int result = ExecuteNonQuery(connString, "PublishOrders", 24, 36);
/// </remarks>
/// <param name="connectionString">一个有效的数据库连接字符串/param>
/// <param name="spName">存储过程名称</param>
/// <param name="parameterValues">分配到存储过程输入参数的对象数组</param>
/// <returns>返回受影响的行数</returns>
public static int ExecuteNonQuery(string connectionString, string spName, params object[] parameterValues)
{
if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

// 如果存在参数值
if ((parameterValues != null) && (parameterValues.Length > 0))
{
// 从探索存储过程参数(加载到缓存)并分配给存储过程参数数组.
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

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

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

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

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

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

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

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

/// <summary>
/// 执行指定数据库连接对象的命令,将对象数组的值赋给存储过程参数.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值
/// 示例:
/// int result = ExecuteNonQuery(conn, "PublishOrders", 24, 36);
/// </remarks>
/// <param name="connection">一个有效的数据库连接对象</param>
/// <param name="spName">存储过程名</param>
/// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>
/// <returns>返回影响的行数</returns>
public static int ExecuteNonQuery(SqlConnection connection, string spName, params object[] parameterValues)
{
if (connection == null) throw new ArgumentNullException("connection");
if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

// 如果有参数值
if ((parameterValues != null) && (parameterValues.Length > 0))
{
// 从缓存中加载存储过程参数
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

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

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

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

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

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

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

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

/// <summary>
/// 执行带事务的SqlCommand(指定参数值).
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值
/// 示例:
/// int result = ExecuteNonQuery(conn, trans, "PublishOrders", 24, 36);
/// </remarks>
/// <param name="transaction">一个有效的数据库连接对象</param>
/// <param name="spName">存储过程名</param>
/// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>
/// <returns>返回受影响的行数</returns>
public static int ExecuteNonQuery(SqlTransaction transaction, string spName, params object[] parameterValues)
{
if (transaction == null) throw new ArgumentNullException("transaction");
if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

// 如果有参数值
if ((parameterValues != null) && (parameterValues.Length > 0))
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

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

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

#endregion ExecuteNonQuery方法结束

#region ExecuteDataset方法

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

/// <summary>
/// 执行指定数据库连接字符串的命令,返回DataSet.
/// </summary>
/// <remarks>
/// 示例:
/// DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connectionString">一个有效的数据库连接字符串</param>
/// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
/// <param name="commandText">存储过程名称或T-SQL语句</param>
/// <param name="commandParameters">SqlParamters参数数组</param>
/// <returns>返回一个包含结果集的DataSet</returns>
public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");

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

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

/// <summary>
/// 执行指定数据库连接字符串的命令,直接提供参数值,返回DataSet.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值.
/// 示例:
/// DataSet ds = ExecuteDataset(connString, "GetOrders", 24, 36);
/// </remarks>
/// <param name="connectionString">一个有效的数据库连接字符串</param>
/// <param name="spName">存储过程名</param>
/// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>
/// <returns>返回一个包含结果集的DataSet</returns>
public static DataSet ExecuteDataset(string connectionString, string spName, params object[] parameterValues)
{
if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

if ((parameterValues != null) && (parameterValues.Length > 0))
{
// 从缓存中检索存储过程参数
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

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

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

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

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

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

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

// 填充DataSet.
da.Fill(ds);

cmd.Parameters.Clear();

if (mustCloseConnection)
connection.Close();

return ds;
}
}

/// <summary>
/// 执行指定数据库连接对象的命令,指定参数值,返回DataSet.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输入参数和返回值.
/// 示例.:
/// DataSet ds = ExecuteDataset(conn, "GetOrders", 24, 36);
/// </remarks>
/// <param name="connection">一个有效的数据库连接对象</param>
/// <param name="spName">存储过程名</param>
/// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>
/// <returns>返回一个包含结果集的DataSet</returns>
public static DataSet ExecuteDataset(SqlConnection connection, string spName, params object[] parameterValues)
{
if (connection == null) throw new ArgumentNullException("connection");
if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

if ((parameterValues != null) && (parameterValues.Length > 0))
{
// 比缓存中加载存储过程参数
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

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

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

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

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

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

/// <summary>
/// 执行指定事务的命令,指定参数值,返回DataSet.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输入参数和返回值.
/// 示例.:
/// DataSet ds = ExecuteDataset(trans, "GetOrders", 24, 36);
/// </remarks>
/// <param name="transaction">事务</param>
/// <param name="spName">存储过程名</param>
/// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>
/// <returns>返回一个包含结果集的DataSet</returns>
public static DataSet ExecuteDataset(SqlTransaction transaction, string spName, params object[] parameterValues)
{
if (transaction == null) throw new ArgumentNullException("transaction");
if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

if ((parameterValues != null) && (parameterValues.Length > 0))
{
// 从缓存中加载存储过程参数
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

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

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

#endregion ExecuteDataset数据集命令结束

#region ExecuteReader 数据阅读器

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

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

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

// 创建数据阅读器
SqlDataReader dataReader;

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

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

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

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

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

/// <summary>
/// 执行指定数据库连接字符串的数据阅读器,指定参数.
/// </summary>
/// <remarks>
/// 示例:
/// SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connectionString">一个有效的数据库连接字符串</param>
/// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
/// <param name="commandText">存储过程名或T-SQL语句</param>
/// <param name="commandParameters">SqlParamter参数数组(new SqlParameter("@prodid", 24))</param>
/// <returns>返回包含结果集的SqlDataReader</returns>
public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
SqlConnection connection = null;
try
{
connection = new SqlConnection(connectionString);
connection.Open();

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

}

/// <summary>
/// 执行指定数据库连接字符串的数据阅读器,指定参数值.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值参数.
/// 示例:
/// SqlDataReader dr = ExecuteReader(connString, "GetOrders", 24, 36);
/// </remarks>
/// <param name="connectionString">一个有效的数据库连接字符串</param>
/// <param name="spName">存储过程名</param>
/// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>
/// <returns>返回包含结果集的SqlDataReader</returns>
public static SqlDataReader ExecuteReader(string connectionString, string spName, params object[] parameterValues)
{
if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

if ((parameterValues != null) && (parameterValues.Length > 0))
{
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

AssignParameterValues(commandParameters, parameterValues);

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

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

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

/// <summary>
/// [调用者方式]执行指定数据库连接对象的数据阅读器,指定参数值.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值参数.
/// 示例:
/// SqlDataReader dr = ExecuteReader(conn, "GetOrders", 24, 36);
/// </remarks>
/// <param name="connection">一个有效的数据库连接对象</param>
/// <param name="spName">T存储过程名</param>
/// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>
/// <returns>返回包含结果集的SqlDataReader</returns>
public static SqlDataReader ExecuteReader(SqlConnection connection, string spName, params object[] parameterValues)
{
if (connection == null) throw new ArgumentNullException("connection");
if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

if ((parameterValues != null) && (parameterValues.Length > 0))
{
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

AssignParameterValues(commandParameters, parameterValues);

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

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

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

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

/// <summary>
/// [调用者方式]执行指定数据库事务的数据阅读器,指定参数值.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值参数.
///
/// 示例:
/// SqlDataReader dr = ExecuteReader(trans, "GetOrders", 24, 36);
/// </remarks>
/// <param name="transaction">一个有效的连接事务</param>
/// <param name="spName">存储过程名称</param>
/// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>
/// <returns>返回包含结果集的SqlDataReader</returns>
public static SqlDataReader ExecuteReader(SqlTransaction transaction, string spName, params object[] parameterValues)
{
if (transaction == null) throw new ArgumentNullException("transaction");
if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

// 如果有参数值
if ((parameterValues != null) && (parameterValues.Length > 0))
{
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

AssignParameterValues(commandParameters, parameterValues);

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

#endregion ExecuteReader数据阅读器

#region ExecuteScalar 返回结果集中的第一行第一列

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

/// <summary>
/// 执行指定数据库连接字符串的命令,指定参数,返回结果集中的第一行第一列.
/// </summary>
/// <remarks>
/// 示例:
/// int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connectionString">一个有效的数据库连接字符串</param>
/// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
/// <param name="commandText">存储过程名称或T-SQL语句</param>
/// <param name="commandParameters">分配给命令的SqlParamter参数数组</param>
/// <returns>返回结果集中的第一行第一列</returns>
public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
// 创建并打开数据库连接对象,操作完成释放对象.
using (SqlConnection connection = new SqlConnection(connectionString))
{
connection.Open();

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

/// <summary>
/// 执行指定数据库连接字符串的命令,指定参数值,返回结果集中的第一行第一列.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值参数.
///
/// 示例:
/// int orderCount = (int)ExecuteScalar(connString, "GetOrderCount", 24, 36);
/// </remarks>
/// <param name="connectionString">一个有效的数据库连接字符串</param>
/// <param name="spName">存储过程名称</param>
/// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>
/// <returns>返回结果集中的第一行第一列</returns>
public static object ExecuteScalar(string connectionString, string spName, params object[] parameterValues)
{
if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

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

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

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

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

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

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

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

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

if (mustCloseConnection)
connection.Close();

return retval;
}

/// <summary>
/// 执行指定数据库连接对象的命令,指定参数值,返回结果集中的第一行第一列.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值参数.
///
/// 示例:
/// int orderCount = (int)ExecuteScalar(conn, "GetOrderCount", 24, 36);
/// </remarks>
/// <param name="connection">一个有效的数据库连接对象</param>
/// <param name="spName">存储过程名称</param>
/// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>
/// <returns>返回结果集中的第一行第一列</returns>
public static object ExecuteScalar(SqlConnection connection, string spName, params object[] parameterValues)
{
if (connection == null) throw new ArgumentNullException("connection");
if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

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

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

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

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

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

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

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

/// <summary>
/// 执行指定数据库事务的命令,指定参数值,返回结果集中的第一行第一列.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值参数.
///
/// 示例:
/// int orderCount = (int)ExecuteScalar(trans, "GetOrderCount", 24, 36);
/// </remarks>
/// <param name="transaction">一个有效的连接事务</param>
/// <param name="spName">存储过程名称</param>
/// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>
/// <returns>返回结果集中的第一行第一列</returns>
public static object ExecuteScalar(SqlTransaction transaction, string spName, params object[] parameterValues)
{
if (transaction == null) throw new ArgumentNullException("transaction");
if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

// 如果有参数值
if ((parameterValues != null) && (parameterValues.Length > 0))
{
// PPull the parameters for this stored procedure from the parameter cache ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

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

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

#endregion ExecuteScalar

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

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

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

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

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

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

/// <summary>
/// 执行指定数据库连接对象的SqlCommand命令,并产生一个XmlReader对象做为结果集返回,指定参数值.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值参数.
///
/// 示例:
/// XmlReader r = ExecuteXmlReader(conn, "GetOrders", 24, 36);
/// </remarks>
/// <param name="connection">一个有效的数据库连接对象</param>
/// <param name="spName">存储过程名称 using "FOR XML AUTO"</param>
/// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>
/// <returns>返回XmlReader结果集对象.</returns>
public static XmlReader ExecuteXmlReader(SqlConnection connection, string spName, params object[] parameterValues)
{
if (connection == null) throw new ArgumentNullException("connection");
if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

// 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");

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

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

/// <summary>
/// 执行指定数据库事务的SqlCommand命令,并产生一个XmlReader对象做为结果集返回,指定参数值.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值参数.
///
/// 示例:
/// XmlReader r = ExecuteXmlReader(trans, "GetOrders", 24, 36);
/// </remarks>
/// <param name="transaction">一个有效的连接事务</param>
/// <param name="spName">存储过程名称</param>
/// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>
/// <returns>返回一个包含结果集的DataSet.</returns>
public static XmlReader ExecuteXmlReader(SqlTransaction transaction, string spName, params object[] parameterValues)
{
if (transaction == null) throw new ArgumentNullException("transaction");
if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

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

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

#endregion ExecuteXmlReader 阅读器结束

#region FillDataset 填充数据集
/// <summary>
/// 执行指定数据库连接字符串的命令,映射数据表并填充数据集.
/// </summary>
/// <remarks>
/// 示例:
/// FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
/// </remarks>
/// <param name="connectionString">一个有效的数据库连接字符串</param>
/// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
/// <param name="commandText">存储过程名称或T-SQL语句</param>
/// <param name="dataSet">要填充结果集的DataSet实例</param>
/// <param name="tableNames">表映射的数据表数组
/// 用户定义的表名 (可有是实际的表名.)</param>
public static void FillDataset(string connectionString, CommandType commandType, string commandText, DataSet dataSet, string[] tableNames)
{
if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
if (dataSet == null) throw new ArgumentNullException("dataSet");

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

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

/// <summary>
/// 执行指定数据库连接字符串的命令,映射数据表并填充数据集.指定命令参数.
/// </summary>
/// <remarks>
/// 示例:
/// FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connectionString">一个有效的数据库连接字符串</param>
/// <param name="commandType">命令类型 (存储过程,命令文本或其它)</param>
/// <param name="commandText">存储过程名称或T-SQL语句</param>
/// <param name="commandParameters">分配给命令的SqlParamter参数数组</param>
/// <param name="dataSet">要填充结果集的DataSet实例</param>
/// <param name="tableNames">表映射的数据表数组
/// 用户定义的表名 (可有是实际的表名.)
/// </param>
public static void FillDataset(string connectionString, CommandType commandType,
string commandText, DataSet dataSet, string[] tableNames,
params SqlParameter[] commandParameters)
{
if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
if (dataSet == null) throw new ArgumentNullException("dataSet");
// 创建并打开数据库连接对象,操作完成释放对象.
using (SqlConnection connection = new SqlConnection(connectionString))
{
connection.Open();

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

/// <summary>
/// 执行指定数据库连接字符串的命令,映射数据表并填充数据集,指定存储过程参数值.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值参数.
///
/// 示例:
/// FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, 24);
/// </remarks>
/// <param name="connectionString">一个有效的数据库连接字符串</param>
/// <param name="spName">存储过程名称</param>
/// <param name="dataSet">要填充结果集的DataSet实例</param>
/// <param name="tableNames">表映射的数据表数组
/// 用户定义的表名 (可有是实际的表名.)
/// </param>
/// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>
public static void FillDataset(string connectionString, string spName,
DataSet dataSet, string[] tableNames,
params object[] parameterValues)
{
if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
if (dataSet == null) throw new ArgumentNullException("dataSet");
// 创建并打开数据库连接对象,操作完成释放对象.
using (SqlConnection connection = new SqlConnection(connectionString))
{
connection.Open();

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

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

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

/// <summary>
/// 执行指定数据库连接对象的命令,映射数据表并填充数据集,指定存储过程参数值.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值参数.
///
/// 示例:
/// FillDataset(conn, "GetOrders", ds, new string[] {"orders"}, 24, 36);
/// </remarks>
/// <param name="connection">一个有效的数据库连接对象</param>
/// <param name="spName">存储过程名称</param>
/// <param name="dataSet">要填充结果集的DataSet实例</param>
/// <param name="tableNames">表映射的数据表数组
/// 用户定义的表名 (可有是实际的表名.)
/// </param>
/// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>
public static void FillDataset(SqlConnection connection, string spName,
DataSet dataSet, string[] tableNames,
params object[] parameterValues)
{
if (connection == null) throw new ArgumentNullException("connection");
if (dataSet == null) throw new ArgumentNullException("dataSet");
if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

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

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

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

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

/// <summary>
/// 执行指定数据库事务的命令,映射数据表并填充数据集,指定存储过程参数值.
/// </summary>
/// <remarks>
/// 此方法不提供访问存储过程输出参数和返回值参数.
///
/// 示例:
/// FillDataset(trans, "GetOrders", ds, new string[]{"orders"}, 24, 36);
/// </remarks>
/// <param name="transaction">一个有效的连接事务</param>
/// <param name="spName">存储过程名称</param>
/// <param name="dataSet">要填充结果集的DataSet实例</param>
/// <param name="tableNames">表映射的数据表数组
/// 用户定义的表名 (可有是实际的表名.)
/// </param>
/// <param name="parameterValues">分配给存储过程输入参数的对象数组</param>
public static void FillDataset(SqlTransaction transaction, string spName,
DataSet dataSet, string[] tableNames,
params object[] parameterValues)
{
if (transaction == null) throw new ArgumentNullException("transaction");
if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
if (dataSet == null) throw new ArgumentNullException("dataSet");
if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

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

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

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

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

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

// 追加表映射
if (tableNames != null && tableNames.Length > 0)
{
string tableName = "Table";
for (int index = 0; index < tableNames.Length; index++)
{
if (tableNames[index] == null || tableNames[index].Length == 0) throw new ArgumentException("The tableNames parameter must contain a list of tables, a value was provided as null or empty string.", "tableNames");
dataAdapter.TableMappings.Add(tableName, tableNames[index]);
tableName += (index + 1).ToString();
}
}

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

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

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

#region UpdateDataset 更新数据集
/// <summary>
/// 执行数据集更新到数据库,指定inserted, updated, or deleted命令.
/// </summary>
/// <remarks>
/// 示例:
/// UpdateDataset(conn, insertCommand, deleteCommand, updateCommand, dataSet, "Order");
/// </remarks>
/// <param name="insertCommand">[追加记录]一个有效的T-SQL语句或存储过程</param>
/// <param name="deleteCommand">[删除记录]一个有效的T-SQL语句或存储过程</param>
/// <param name="updateCommand">[更新记录]一个有效的T-SQL语句或存储过程</param>
/// <param name="dataSet">要更新到数据库的DataSet</param>
/// <param name="tableName">要更新到数据库的DataTable</param>
public static void UpdateDataset(SqlCommand insertCommand, SqlCommand deleteCommand, SqlCommand updateCommand, DataSet dataSet, string tableName)
{
if (insertCommand == null) throw new ArgumentNullException("insertCommand");
if (deleteCommand == null) throw new ArgumentNullException("deleteCommand");
if (updateCommand == null) throw new ArgumentNullException("updateCommand");
if (tableName == null || tableName.Length == 0) throw new ArgumentNullException("tableName");

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

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

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

#region CreateCommand 创建一条SqlCommand命令
/// <summary>
/// 创建SqlCommand命令,指定数据库连接对象,存储过程名和参数.
/// </summary>
/// <remarks>
/// 示例:
/// SqlCommand command = CreateCommand(conn, "AddCustomer", "CustomerID", "CustomerName");
/// </remarks>
/// <param name="connection">一个有效的数据库连接对象</param>
/// <param name="spName">存储过程名称</param>
/// <param name="sourceColumns">源表的列名称数组</param>
/// <returns>返回SqlCommand命令</returns>
public static SqlCommand CreateCommand(SqlConnection connection, string spName, params string[] sourceColumns)
{
if (connection == null) throw new ArgumentNullException("connection");
if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

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

// 如果有参数值
if ((sourceColumns != null) && (sourceColumns.Length > 0))
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

// 将源表的列到映射到DataSet命令中.
for (int index = 0; index < sourceColumns.Length; index++)
commandParameters[index].SourceColumn = sourceColumns[index];

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

return cmd;
}
#endregion

#region ExecuteNonQueryTypedParams 类型化参数(DataRow)
/// <summary>
/// 执行指定连接数据库连接字符串的存储过程,使用DataRow做为参数值,返回受影响的行数.
/// </summary>
/// <param name="connectionString">一个有效的数据库连接字符串</param>
/// <param name="spName">存储过程名称</param>
/// <param name="dataRow">使用DataRow作为参数值</param>
/// <returns>返回影响的行数</returns>
public static int ExecuteNonQueryTypedParams(String connectionString, String spName, DataRow dataRow)
{
if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

// 如果row有值,存储过程必须初始化.
if (dataRow != null && dataRow.ItemArray.Length > 0)
{
// 从缓存中加载存储过程参数,如果缓存中不存在则从数据库中检索参数信息并加载到缓存中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);