C# MySQL 数据库操作类

using System;
using System.Configuration;
using System.Collections;
using System.Data;
using MySql.Data;
using MySql.Data.MySqlClient;
namespace MyData
{
/// <summary>
/// 通用数据库类MySQL 
/// </summary>
public class Class_mysql_conn
{
//public static string ConnStr = @"server=数据库;uid=帐号;pwd=密码;database=数据库;charset=utf8";
public static string ConnStr = MyData.Properties.Settings.Default.my_soft_mysqlConn + "pwd=密码;charset=utf8;";

//打开数据库链接
public static MySqlConnection Open_Conn( string ConnStr)
{
MySqlConnection Conn = new MySqlConnection(ConnStr);
Conn.Open(); 
return Conn;
}
//关闭数据库链接
public static void Close_Conn(MySqlConnection Conn)
{
if(Conn != null)
{
Conn.Close();
Conn.Dispose();
}
GC.Collect();
}
//运行MySql语句
public static int Run_SQL(string SQL, string ConnStr)
{
MySqlConnection Conn = Open_Conn(ConnStr);
MySqlCommand Cmd = Create_Cmd(SQL, Conn);
try
{
int result_count = Cmd.ExecuteNonQuery();
Close_Conn(Conn);
return result_count;
}
catch
{
Close_Conn(Conn);
return 0;
}
} 
// 生成Command对象 
public static MySqlCommand Create_Cmd(string SQL, MySqlConnection Conn)
{
MySqlCommand Cmd = new MySqlCommand(SQL, Conn);
return Cmd;
}
// 运行MySql语句返回 DataTable
public static DataTable Get_DataTable(string SQL, string ConnStr, string Table_name)
{
MySqlDataAdapter Da = Get_Adapter(SQL, ConnStr);
DataTable dt = new DataTable(Table_name);
Da.Fill(dt);
return dt;
}
// 运行MySql语句返回 MySqlDataReader对象
public static MySqlDataReader Get_Reader(string SQL, string ConnStr) 
{
MySqlConnection Conn = Open_Conn(ConnStr);
MySqlCommand Cmd = Create_Cmd(SQL, Conn);
MySqlDataReader Dr;
try
{
Dr = Cmd.ExecuteReader(CommandBehavior.Default);
}
catch
{
throw new Exception(SQL);
}
Close_Conn(Conn);
return Dr;
}
// 运行MySql语句返回 MySqlDataAdapter对象 
public static MySqlDataAdapter Get_Adapter(string SQL, string ConnStr) 
{
MySqlConnection Conn = Open_Conn(ConnStr);
MySqlDataAdapter Da = new MySqlDataAdapter(SQL, Conn);
return Da;
}
// 运行MySql语句,返回DataSet对象
public static DataSet Get_DataSet(string SQL, string ConnStr, DataSet Ds) 
{
MySqlDataAdapter Da = Get_Adapter(SQL, ConnStr);
try
{
Da.Fill(Ds);
}
catch(Exception Err)
{
throw Err;
}
return Ds;
}
// 运行MySql语句,返回DataSet对象
public static DataSet Get_DataSet(string SQL, string ConnStr, DataSet Ds, string tablename) 
{
MySqlDataAdapter Da = Get_Adapter(SQL, ConnStr);
try
{
Da.Fill(Ds,tablename);
}
catch(Exception Ex)
{
throw Ex;
}
return Ds;
}
// 运行MySql语句,返回DataSet对象，将数据进行了分页
public static DataSet Get_DataSet(string SQL, string ConnStr, DataSet Ds, int StartIndex, int PageSize, string tablename)
{
MySqlConnection Conn = Open_Conn(ConnStr);
MySqlDataAdapter Da = Get_Adapter(SQL, ConnStr);
try
{
Da.Fill(Ds, StartIndex, PageSize, tablename);
}
catch(Exception Ex)
{
throw Ex;
}
Close_Conn(Conn);
return Ds;
}
// 返回MySql语句执行结果的第一行第一列
public static string Get_Row1_Col1_Value(string SQL, string ConnStr) 
{
MySqlConnection Conn = Open_Conn(ConnStr);
string result;
MySqlDataReader Dr ;
try
{
Dr = Create_Cmd(SQL,Conn).ExecuteReader();
if (Dr.Read())
{
result = Dr[0].ToString();
Dr.Close(); 
}
else
{
result = "";
Dr.Close(); 
}
}
catch
{
throw new Exception(SQL);
}
Close_Conn(Conn);
return result;
} 
}
}

------------------------------------------------------------------
app.config 里的数据库链接字符串
------------------------------------------------------------------
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
</configSections>
<connectionStrings>
<add name="MyData.Properties.Settings.my_soft_mysqlConn" connectionString="server=localhost;database=my_soft;uid=root;"
</connectionStrings>
</configuration>