c#连接mysql数据库

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

namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
/*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
* */

private void button1_Click(object sender, EventArgs e)
{
string findName = textBox2.Text.Trim();
textBox1.Text = "";
textBox3.Text = "";
textBox4.Text = "";
textBox5.Text = "";
textBox6.Text = "";

MySQLConnectionString tConnstr = new MySQLConnectionString("这里是mysql地址", "库名", "登录名", "密码");
MySQLConnection tConn = new MySQLConnection(tConnstr.AsString);
try
{
tConn.Open();
MySQLCommand cmd4 = new MySQLCommand("set names gb2312", tConn);
cmd4.ExecuteNonQuery();

string tCmd = "SELECT * FROM `mdl_user` WHERE `lastname`="+"\""+findName+"\"";

MySQLCommand cmd = new MySQLCommand(tCmd, tConn);

MySQLDataReader tReader = cmd.ExecuteReaderEx();

while(tReader.Read())
{

textBox1.AppendText(tReader["lastip"].ToString() + "\n");
textBox3.AppendText(tReader["username"].ToString()+"\n");
textBox4.AppendText(tReader["firstname"].ToString() + "\n");
textBox5.AppendText(tReader["password"].ToString() + "\n");
textBox6.AppendText(tReader["email"].ToString() + "\n");
}

tConn.Close();
tReader.Close();
}
catch
{
tConn.Close();
}
}

}
}

//上面这种方法，有点局限性，因为必须得要安装mysql.net的那几个插件

下面这种虽然需要导入引用，但不需要安装插件。

所以，本人常常使用这种方式：

但也需要引用：mysql-connector-net-6.8.3-noinstall里的.dll库文件。

如需要，百度mysql-connector-net-6.8.3-noinstall即可。

主要源码如下：

public void login()
{
string now = DateTime.Now.ToString();//获取系统时间
string user = Form1.xxone;
string hostname = Dns.GetHostName();//获得本机名字
IPHostEntry hostInfo = Dns.GetHostByName(Dns.GetHostName());
string ipss = (hostInfo.AddressList[0].ToString());

for (int i = 0; i < hostInfo.AddressList.Length; i++)
ipss = ipss + "    "+hostInfo.AddressList[i];//获得本机
string mystr = "server=mysql地址;User Id=用户名;password=密码;Database=库名";//定义连接字符串
MySqlConnection mycon = new MySqlConnection(mystr);
try
{
mycon.Open();

string tCmd = string.Format("INSERT INTO `cardlose` (`stuNumber`,`ip`,`uptime`,`hostname`,`number`)VALUES ('{0}', '{1}', '{2}','{3}','{4}')", user, ipss, now,hostname,"");
MySqlCommand cmd = new MySqlCommand(tCmd, mycon);
cmd.ExecuteNonQuery();
mycon.Close();
}

catch
{
mycon.Close();
}
}