C#连接操作mysql实例

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第三方组件：Mysql.Data.dll
说明：去官方网站下载Mysql.Data.dll，然后在项目中添加该组件的引用，在代码页里输入using Mysql.Data.MysqlClient，我们就可以顺利的使用该类库的函数建立连接了。

以下是几个常用函数：

#region 建立MySql数据库连接
/// <summary>
/// 建立数据库连接.
/// </summary>
/// <returns>返回MySqlConnection对象</returns>
public MySqlConnection getmysqlcon()
{
string M_str_sqlcon = "server=localhost;user id=root;password=root;database=abc"; //根据自己的设置
MySqlConnection myCon = new MySqlConnection(M_str_sqlcon);
return myCon;
}
#endregion

#region 执行MySqlCommand命令
/// <summary>
/// 执行MySqlCommand
/// </summary>
/// <param name="M_str_sqlstr">SQL语句</param>
public void getmysqlcom(string M_str_sqlstr)
{
MySqlConnection mysqlcon = this.getmysqlcon();
mysqlcon.Open();
MySqlCommand mysqlcom = new MySqlCommand(M_str_sqlstr, mysqlcon);
mysqlcom.ExecuteNonQuery();
mysqlcom.Dispose();
mysqlcon.Close();
mysqlcon.Dispose();
}
#endregion

#region 创建MySqlDataReader对象
/// <summary>
/// 创建一个MySqlDataReader对象
/// </summary>
/// <param name="M_str_sqlstr">SQL语句</param>
/// <returns>返回MySqlDataReader对象</returns>
public MySqlDataReader getmysqlread(string M_str_sqlstr)
{
MySqlConnection mysqlcon = this.getmysqlcon();
MySqlCommand mysqlcom = new MySqlCommand(M_str_sqlstr, mysqlcon);
mysqlcon.Open();
MySqlDataReader mysqlread = mysqlcom.ExecuteReader(CommandBehavior.CloseConnection);
return mysqlread;
}
#endregion

另一篇：

测试环境：Windows XP + MySql 5.0.24 + Visual C# 2008 Exdivss Edition
By lucas 2008.12.29
1、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();
}
}
}

2、通过ODBC访问mysql数据库：
参考：http://www.microsoft.com/china/community/Column/63.mspx
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();
}
/
/
MyConnection.Close();
}
}
}

使用示例：

using System;
using System.Configuration;
using MySql.Data.MySqlClient;
/// <summary>
/// TestDatebase 的摘要说明
/// </summary>
public class TestDatebase
{
public TestDatebase()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
public static void Main(String[] args)
{
MySqlConnection mysql = getMySqlCon();
//查询sql
String sqlSearch = "select * from student";
//插入sql
String sqlInsert = "insert into student values (12,'张三',25,'大专')";
//修改sql
String sqlUpdate = "update student set name='李四' where id= 3";
//删除sql
String sqlDel = "delete from student where id = 12";
//打印SQL语句
Console.WriteLine(sqlDel);
//四种语句对象
//MySqlCommand mySqlCommand = getSqlCommand(sqlSearch, mysql);
//MySqlCommand mySqlCommand = getSqlCommand(sqlInsert, mysql);
//MySqlCommand mySqlCommand = getSqlCommand(sqlUpdate, mysql);
MySqlCommand mySqlCommand = getSqlCommand(sqlDel, mysql);
mysql.Open();
//getResultset(mySqlCommand);
//getInsert(mySqlCommand);
//getUpdate(mySqlCommand);
getDel(mySqlCommand);
//记得关闭
mysql.Close();
String readLine = Console.ReadLine();
}
/// <summary>
/// 建立mysql数据库链接
/// </summary>
/// <returns></returns>
public static MySqlConnection getMySqlCon()
{
String mysqlStr = "Database=test;Data Source=127.0.0.1;User Id=root;Password=root;pooling=false;CharSet=utf8;port=3306";
// String mySqlCon = ConfigurationManager.ConnectionStrings["MySqlCon"].ConnectionString;
MySqlConnection mysql = new MySqlConnection(mysqlStr);
return mysql;
}
/// <summary>
/// 建立执行命令语句对象
/// </summary>
/// <param name="sql"></param>
/// <param name="mysql"></param>
/// <returns></returns>
public static MySqlCommand getSqlCommand(String sql,MySqlConnection mysql)
{
MySqlCommand mySqlCommand = new MySqlCommand(sql, mysql);
// MySqlCommand mySqlCommand = new MySqlCommand(sql);
// mySqlCommand.Connection = mysql;
return mySqlCommand;
}
/// <summary>
/// 查询并获得结果集并遍历
/// </summary>
/// <param name="mySqlCommand"></param>
public static void getResultset(MySqlCommand mySqlCommand)
{
MySqlDataReader reader = mySqlCommand.ExecuteReader();
try
{
while (reader.Read())
{
if (reader.HasRows)
{
Console.WriteLine("编号:" + reader.GetInt32(0) + "|姓名:" + reader.GetString(1) + "|年龄:" + reader.GetInt32(2) + "|学历:" + reader.GetString(3));
}
}
}
catch (Exception)
{

Console.WriteLine("查询失败了！");
}
finally
{
reader.Close();
}
}
/// <summary>
/// 添加数据
/// </summary>
/// <param name="mySqlCommand"></param>
public static void getInsert(MySqlCommand mySqlCommand)
{
try
{
mySqlCommand.ExecuteNonQuery();
}
catch (Exception ex)
{
String message = ex.Message;
Console.WriteLine("插入数据失败了！" + message);
}

}
/// <summary>
/// 修改数据
/// </summary>
/// <param name="mySqlCommand"></param>
public static void getUpdate(MySqlCommand mySqlCommand)
{
try
{
mySqlCommand.ExecuteNonQuery();
}
catch (Exception ex)
{

String message = ex.Message;
Console.WriteLine("修改数据失败了！" + message);
}
}
/// <summary>
/// 删除数据
/// </summary>
/// <param name="mySqlCommand"></param>
public static void getDel(MySqlCommand mySqlCommand)
{
try
{
mySqlCommand.ExecuteNonQuery();
}
catch (Exception ex)
{
String message = ex.Message;
Console.WriteLine("删除数据失败了！" + message);
}
}
}