1.数据操作类 SqlDBhelper

using System;

using System.Collections.Generic;

using System.Data.SqlClient;

using System.Configuration;

using System.Data;

namespace MessageTool

{

    
public class SqlDbhelper

    {

       
private SqlConnection conn;

       
private SqlCommand cmd;

       
private SqlDataReader reader;

       
private SqlDataAdapter adapter;

       
public  string connectionString =
System.Configuration.ConfigurationSettings.AppSettings["connectionstring"];

 

       
public string ConnectionString

       
{

           
get { return this.connectionString; }

           
set { this.connectionString = value; }

       
}

 

       
///

       
/// 获取一个未打开连接的SqlConnection对象

       
///

       
/// SqlConnection对象

       
public SqlConnection GetConnection()

       
{

           
if (conn != null)

               
return this.conn;

           
return this.conn = new SqlConnection(connectionString);

       
}

 

       
///

       
/// 使用连接字符串获取未打开连接SqlConnection对象

       
///

       
/// 连接字符串

       
/// SqlConnection对象

       
public SqlConnection GetConnection(string _connStr)

       
{

           
if (this.conn != null)

               
this.conn.ConnectionString = _connStr;