两种方法连接MySql数据库

1、用MySQLDriverCS连接MySQL数据库

先下载和安装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。

    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();  

            }  


        }  
    }  
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2、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(""n success, connected successfully !"n");  

                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();  
            }  
        }  
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