c#连接MySql数据库的两种方法

一、用MySQLDriverCS连接MySQL数据库

    先下载和安装MySQLDriverCS，地址：

    http://sourceforge.net/projects/mysqldrivercs/

    在安装文件夹下面找到MySQLDriver.dll，然后将MySQLDriver.dll添加引用到项目中

    注：我下载的是版本是 MySQLDriverCS-n-EasyQueryTools-4.0.1-DotNet2.0.exe

     using  System;
     using  System.Collections.Generic;
     using  System.ComponentModel;
     using  System.Data;
     using  System.Data.Odbc;
     using  System.Drawing;
     using  System.Linq;
     using  System.Text;
     using  System.Windows.Forms;
     using  MySQLDriverCS;

     namespace  mysql
    {
         public   partial   class  Form1 : Form
        {
             public  Form1()
            {
                InitializeComponent();
            }

             private   void  Form1_Load( object  sender, EventArgs e)
            {
            MySQLConnection conn  =   null ;
            conn  =   new  MySQLConnection( new  MySQLConnectionString( " localhost " ,  " inv " ,  " root " ,  " 831025 " ).AsString);
            conn.Open();
            MySQLCommand commn  =   new  MySQLCommand( " set names gb2312 " , conn);
            commn.ExecuteNonQuery();
             string  sql  =   " select * from exchange  " ;
            MySQLDataAdapter mda  =   new  MySQLDataAdapter(sql, conn);
            DataSet ds  =   new  DataSet();
            mda.Fill(ds,  " table1 " );
             this .dataGrid1.DataSource  =  ds.Tables[ " table1 " ];
            conn.Close();
            }
        }
    }

二、通过ODBC访问mysql数据库：

    1.安装Microsoft ODBC.net：我安装的是mysql-connector-odbc-3.51.22-win32.msi

    2.安装MDAC 2.7或者更高版本：我安装的是mdac_typ.exe 2.7简体中文版

    3.安装MySQL的ODBC驱动程序：我安装的是 odbc_net.msi

    4.管理工具 -> 数据源ODBC –>配置DSN…

    5.解决方案管理中添加引用 Microsoft.Data.Odbc.dll(1.0.3300)

    6.代码中增加引用 using Microsoft.Data.Odbc;

     using  System;
     using  System.Collections.Generic;
     using  System.ComponentModel
     using  System.Drawing;
     using  System.Linq;    // vs2005好像没有这个命名空间，在c#2008下测试自动生成的
     using  System.Text;
     using  System.Windows.Forms;
     using  Microsoft.Data.Odbc;

     namespace  mysql
    {
         public   partial   class  Form1 : Form
        {
             public  Form1()
            {
                InitializeComponent();
            }

             private   void  Form1_Load( object  sender, EventArgs e)
            {
                 string  MyConString  =   " DRIVER={MySQL ODBC 3.51 Driver}; "   +

                                      " SERVER=localhost; "   +

                                      " DATABASE=inv; "   +

                                      " UID=root; "   +

                                      " PASSWORD=831025; "   +

                                      " OPTION=3 " ;

                OdbcConnection MyConnection  =   new  OdbcConnection(MyConString);
                MyConnection.Open();
                Console.WriteLine( "  success, connected successfully ! " );
                 string  query  =   " insert into test values( 'hello', 'lucas', 'liu') " ;
                OdbcCommand cmd  =   new  OdbcCommand(query, MyConnection);
                 // 处理异常：插入重复记录有异常
                 try
                {
                     cmd.ExecuteNonQuery();
                 }

                 catch (Exception ex)
                 {
                     Console.WriteLine( " record duplicate. " );
                 }

                  finally
                 {
                     cmd.Dispose();
                 }

     // ***********************用read方法读数据到textbox**********************

                 string  tmp1  =   null ;
                 string  tmp2  =   null ;
                 string  tmp3  =   null ;
                query  =   " select * from test  " ;
                OdbcCommand cmd2  =   new  OdbcCommand(query, MyConnection);
                OdbcDataReader reader  =  cmd2.ExecuteReader();

                 while  (reader.Read())
                {
                    tmp1  =  reader[ 0 ].ToString();
                    tmp2  =  reader[ 1 ].ToString();
                    tmp3  =  reader[ 2 ].ToString();
                }
                 this .textBox1.Text  =  tmp1  +   "   "   +  tmp2  +   "   "   +  tmp3;

                 */

     // ************************用datagridview控件显示数据表**************************
     string  MyConString  =   " DRIVER={MySQL ODBC 3.51 Driver}; "   +
                                      " SERVER=localhost; "   +
                                      " DATABASE=inv; "   +
                                      " UID=root; "   +
                                      " PASSWORD=831025; "   +
                                      " OPTION=3 " ;
              OdbcConnection MyConnection  =   new  OdbcConnection(MyConString);
              OdbcDataAdapter oda  =   new  OdbcDataAdapter( " select * from customer  " , MyConnection);
              DataSet ds  =   new  DataSet();
              oda.Fill(ds,  " employee " );
               this .dataGridView1.DataSource  =  ds.Tables[ " employee " ];
     */
               MyConnection.Close();
            }
        }
    }