[C#]获取连接MySql数据库及常用的CRUD操作

时间:2025-03-18 14:34:02

测试如下:

首先添加引用:MySql.Data.dll

链接:http://pan.baidu.com/s/1dEQgLpf 密码:bnyu

*将链接数据库的信息放入配置文件中(app.config)

     <appSettings>
<add key="mysql" value="server=127.0.0.1;User Id=******;password=******;Database="******"/>
</appSettings>

*在程序启动时进行启动

   private string mysqlString = ConfigurationManager.AppSettings["mysql"].ToString();

①建立mysql数据库链接

         //建立mysql数据库链接
public MySqlConnection getMySqlConn()
{
//string constr = "server=localhost;User Id=root;password=123456;Database=qqmusicdistinct";
string constr = mysqlString;
MySqlConnection mycon = new MySqlConnection(constr);
7 return mycon;
}

②建立执行命令语句对象

         //建立执行命令语句对象
public MySqlCommand getSqlCommand(String sql, MySqlConnection mysql)
{
MySqlCommand mySqlCommand = new MySqlCommand(sql, mysql);
return mySqlCommand;
}

③编写sql语句,对数据做相应处理

         //编写sql语句,对数据做相应处理
public void setData()
{
MySqlConnection mysql = getMySqlConn();
//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"; //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();
}

④Ⅰ.查询并获得结果集并遍历

         //查询并获得结果集并遍历
public void getResultset(MySqlCommand mySqlCommand)
{
MySqlDataReader reader = mySqlCommand.ExecuteReader();
try
{
while (reader.Read())
{
if (reader.HasRows)
{
//MessageBox.Show("歌曲名:" + reader.GetString(1) + "|歌手:" + reader.GetString(2));
}
}
}
catch (Exception)
{
MessageBox.Show("查询失败了!");
}
finally
{
reader.Close();
}
}

④Ⅱ.添加数据

         //添加数据
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);
} }

④Ⅲ.修改数据

         //修改数据
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);
}
}

④Ⅳ.删除数据

         //删除数据
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);
}
}