SqlServerHelper类，整理微软提供的helper

微软在petShop中使用了SqlServerHelper类，通过调用静态方法实现对数据库的操作，使用起来非常简单顺手，下面整理了该类的代码，并加以说明：

//------------------------------------------------------------
// All Rights Reserved , Copyright (C) 2010 , lusens
//------------------------------------------------------------

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

namespace Utility.Data
{
/// <summary>
/// SQLServer数据库操作类
/// 本类主要包括SQLServer数据库的基本操作
///
/// 修改纪录
///
///     2010.10.22 版本：1.1 lusens 新增了用户传入sql语句列表的事务操作
///		2010.09.05 版本：1.0 lusens 创建。
///
/// 版本：1.1
///
/// <author>
///		<name>lusens</name>
///		<date>2010.09.05</date>
///		<EMail>lusens@foxmail.com</EMail>
/// </author>
/// </summary>
public abstract class SQLServerHepler
{
//public static readonly string ConnectionString = System.Configuration.ConfigurationManager.ConnectionStrings["SQLConnString"].ConnectionString;

#region public static string GetConnectionStringByConfig()
/// <summary>
/// 读取配置文件的ConnectionString字符串
/// </summary>
/// <returns>Connection连接字符串</returns>
public static string GetConnectionStringByConfig()
{
return System.Configuration.ConfigurationManager.ConnectionStrings["SQLConnString"].ConnectionString;
}
#endregion

#region 执行SQL，返回被操作的行数,public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)

/// <summary>
/// 执行SQL语句，返回被操作的行数
/// 使用using语句进行conn对象的释放
/// </summary>
/// <param name="connectionString">连接字符</param>
/// <param name="cmdType">Command类型，SQL语句或存储过程</param>
/// <param name="cmdText">SQL语句或存储过程名称</param>
/// <param name="commandParameters">参数数组</param>
/// <returns>返回被操作行数</returns>
public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
SqlCommand cmd = new SqlCommand();
using (SqlConnection conn = new SqlConnection(connectionString))
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return val;
}
}
#endregion

#region 执行SQL，返回被操作的行数,public static int ExecuteNonQuery(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
/// <summary>
/// 执行SQL语句，返回被操作的行数
/// 这里默认使用外面传入的conn对象，使用完成后不会对conn对象进行释放，需要自己在外面进行数据库连接释放
/// </summary>
/// <param name="connection">数据库连接对象</param>
/// <param name="cmdType">command命令类型，SQL语句或存储过程</param>
/// <param name="cmdText">SQL语句或存储过程名称</param>
/// <param name="commandParameters">参数数组</param>
/// <returns></returns>
public static int ExecuteNonQuery(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
SqlCommand cmd = new SqlCommand();
PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return val;
}
#endregion

#region 执行SQL语句，返回被操作的行数,public static int ExecuteNonQuery(SqlTransaction trans, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
/// <summary>
/// 执行SQL语句，返回被操作的行数
/// 这里默认使用外面传入的conn对象，使用完成后不会对conn对象进行释放，需要自己在外面进行数据库连接释放
/// </summary>
/// <param name="trans">SQL事务</param>
/// <param name="cmdType">command类型，SQL语句或存储过程</param>
/// <param name="cmdText">SQL语句或存储过程名称</param>
/// <param name="commandParameters">参数数组</param>
/// <returns></returns>
public static int ExecuteNonQuery(SqlTransaction trans, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
SqlCommand cmd = new SqlCommand();
PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, commandParameters);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return val;
}

#endregion

#region 执行SQL，返回SqlDataReader,public static SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
/// <summary>
/// 执行SQL，返回SqlDataReader
/// 返回一个连接，所以不能进行conn释放，在外界代码中使用完DataReader后，注意需要释放reader对象
/// 当返回连接对象报错时，这里进行数据库连接的关闭，保证数据库连接使用完成后保持关闭
/// </summary>
/// <param name="connectionString">数据库连接字符串</param>
/// <param name="cmdType">command命令类型，SQL语句或存储过程</param>
/// <param name="cmdText">SQL语句或存储过程名称</param>
/// <param name="commandParameters">参数数组</param>
/// <returns></returns>
public static SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
SqlCommand cmd = new SqlCommand();
SqlConnection conn = new SqlConnection(connectionString);

try
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
cmd.Parameters.Clear();
return rdr;
}
catch (Exception e)
{
conn.Close();
throw e;
}
}
#endregion

#region 执行SQL，返回SqlDataReader, public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
/// <summary>
/// 执行SQL，返回SqlDataReader
/// 返回一个连接，所以不能进行conn释放，在外界代码中使用完DataReader后，注意需要释放reader对象
/// 当返回连接对象报错时，这里进行数据库连接的关闭，保证数据库连接使用完成后保持关闭
/// </summary>
/// <param name="connection">SqlConnection数据库连接对象</param>
/// <param name="cmdType">command命令类型，SQL语句或存储过程</param>
/// <param name="cmdText">SQL语句或存储过程名称</param>
/// <param name="commandParameters">参数数组</param>
/// <returns></returns>
public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
SqlCommand cmd = new SqlCommand();

try
{
PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
cmd.Parameters.Clear();
return rdr;
}
catch (Exception e)
{
connection.Close();
throw e;
}
}
#endregion

#region 执行SQL，返回DataTable， public static DataTable ExecuteDataTable(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
/// <summary>
/// 执行SQL，返回DataTable
/// 使用using语句进行conn对象的释放
/// </summary>
/// <param name="connectionString">数据库连接字符串</param>
/// <param name="cmdType">command命令类型，SQL语句或存储过程</param>
/// <param name="cmdText">SQL语句或存储过程名称</param>
/// <param name="commandParameters">参数数组</param>
/// <returns></returns>
public static DataTable ExecuteDataTable(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
DataTable dt = new DataTable();
SqlCommand cmd = new SqlCommand();

using (SqlConnection conn = new SqlConnection(connectionString))
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
using (SqlDataAdapter sda = new SqlDataAdapter())
{
sda.SelectCommand = cmd;
sda.Fill(dt);
}
}

return dt;
}
#endregion

#region 执行SQL，返回DataTable,public static DataTable ExecuteDataTable(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
/// <summary>
/// 执行SQL，返回DataTable
/// 这里默认使用外面传入的conn对象，使用完成后不会对conn对象进行释放，需要自己在外面进行数据库连接释放
/// </summary>
/// <param name="connection">数据库连接对象</param>
/// <param name="cmdType">Command命令类型，SQL语句或存储过程</param>
/// <param name="cmdText">SQL语句或存储过程名称</param>
/// <param name="commandParameters">参数数组</param>
/// <returns></returns>
public static DataTable ExecuteDataTable(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
DataTable dt = new DataTable();
SqlCommand cmd = new SqlCommand();

PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
using (SqlDataAdapter sda = new SqlDataAdapter())
{
sda.SelectCommand = cmd;
sda.Fill(dt);
}

return dt;
}
#endregion

#region 返回第一行第一列，public static object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
/// <summary>
/// 返回第一行第一列
/// 使用using语句进行conn对象的释放
/// </summary>
/// <param name="connectionString">数据库连接字符串</param>
/// <param name="cmdType">Command命令类型，SQL语句还是存储过程</param>
/// <param name="cmdText">SQL语句或存储过程名称</param>
/// <param name="commandParameters">参数数组</param>
/// <returns></returns>
public static object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
SqlCommand cmd = new SqlCommand();

using (SqlConnection connection = new SqlConnection(connectionString))
{
PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
object val = cmd.ExecuteScalar();
cmd.Parameters.Clear();
return val;
}
}
#endregion

#region 返回第一行第一列，public static object ExecuteScalar(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
/// <summary>
/// 返回第一行第一列
/// 使用外面传入的conn对象，使用完成后不会对conn对象进行释放，需要自己在外面进行数据库连接释放
/// </summary>
/// <param name="connection">SqlConnection数据库连接对象</param>
/// <param name="cmdType">Command命令类型，SQL语句还是存储过程</param>
/// <param name="cmdText">SQL语句或存储过程名称</param>
/// <param name="commandParameters">参数数组</param>
/// <returns></returns>
public static object ExecuteScalar(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
SqlCommand cmd = new SqlCommand();

PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
object val = cmd.ExecuteScalar();
cmd.Parameters.Clear();
return val;
}
#endregion

#region 以事务执行sql语句列表，public static bool ExecuteTransaction(SqlConnection conn, List<string> cmdTextes, List<SqlParameter[]> commandParameterses)
/// <summary>
/// 以事务执行sql语句列表，返回事务执行是否成功
/// </summary>
/// <param name="conn">数据库连接对象</param>
/// <param name="cmdTextes">sql语句列表</param>
/// <param name="commandParameterses">sql语句列表对应的参数列表，参数列表必须与sql语句列表匹配</param>
/// <returns>事务执行是否成功</returns>
public static bool ExecuteTransaction(SqlConnection conn, List<string> cmdTextes, List<SqlParameter[]> commandParameterses)
{
bool flag = false;
if (cmdTextes.Count == commandParameterses.Count)
{
SqlTransaction sqlTran = conn.BeginTransaction();
try
{
for (int i = 0; i < cmdTextes.Count; i++)
{
ExecuteNonQuery(sqlTran, CommandType.Text, cmdTextes[i], commandParameterses[i]);
}
sqlTran.Commit();
flag = true;
}
catch (Exception e)
{
sqlTran.Rollback();
}
}
return flag;
}
#endregion

#region 以事务执行sql语句列表，返回事务执行是否成功，public static bool ExecuteTransaction(string connectionString, List<string> cmdTextes, List<SqlParameter[]> commandParameterses)
/// <summary>
/// 以事务执行sql语句列表，返回事务执行是否成功
/// </summary>
/// <param name="connectionString">数据库连接字符串</param>
/// <param name="cmdTextes">sql语句列表</param>
/// <param name="commandParameterses">sql语句列表对应的参数列表，参数列表必须与sql语句列表匹配</param>
/// <returns></returns>
public static bool ExecuteTransaction(string connectionString, List<string> cmdTextes, List<SqlParameter[]> commandParameterses)
{
bool flag = false;
if (cmdTextes.Count == commandParameterses.Count)
{
using (SqlConnection conn = new SqlConnection(connectionString))
{
SqlTransaction sqlTran = conn.BeginTransaction();
try
{
for (int i = 0; i < cmdTextes.Count; i++)
{
ExecuteNonQuery(sqlTran, CommandType.Text, cmdTextes[i], commandParameterses[i]);
}
sqlTran.Commit();
flag = true;
}
catch (Exception e)
{
sqlTran.Rollback();
}
}
}
return flag;
}
#endregion

#region 构造SQLCommand,private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, CommandType cmdType, string cmdText, SqlParameter[] cmdParms)
/// <summary>
/// 构造SQLCommand
/// </summary>
/// <param name="cmd">Command对象</param>
/// <param name="conn">SqlConnection数据库连接对象</param>
/// <param name="trans">SQL事务</param>
/// <param name="cmdType">Command命令类型</param>
/// <param name="cmdText">SQL语句或存储过程名称</param>
/// <param name="cmdParms">参数数组</param>
private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, CommandType cmdType, string cmdText, SqlParameter[] cmdParms)
{
if (conn.State != ConnectionState.Open)
conn.Open();

cmd.Connection = conn;
cmd.CommandText = cmdText;

if (trans != null)
cmd.Transaction = trans;

cmd.CommandType = cmdType;

if (cmdParms != null)
{
foreach (SqlParameter parm in cmdParms)
cmd.Parameters.Add(parm);
}
}
#endregion
}
}

注意：该类并没有完全封装所有数据对象的使用 ，所以在外面使用类时，也会自行使用SqlConnection、SqlCommand等对象；

可以在 http://download.csdn.net/detail/luxin10/3830325 下载，无需积分