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C#连接MYSQL数据库,包括增删查改_MySQL

时间:2021-07-01 10:21:17 帮助过:6人阅读

C#连接MYSQL数据库,包括增删查改!

public class DBLINK

{

public MySqlConnection GetConn()

{

MySqlConnection mysqlconn = new MySqlConnection("server=localhost;pwd=123;user=root;database=pfms;charset='gb2312'");//1,服务器 2 Mysql的密码 3 mysql的用户名 4 数据库名 5 数据库编码方式

return mysqlconn;

}

}

public class SQLEXQ : DBLINK

{

/// 查询操作

public DataTable Select(string sql)

{

MySqlConnection mysqlconn = null;

MySqlDataAdapter sda = null;

DataTable dt = null;

try

{

mysqlconn = base.GetConn();


sda = new MySqlDataAdapter(sql, mysqlconn);

dt = new DataTable();

sda.Fill(dt);


return dt;

}

catch (Exception)

{


throw;

}


}


/// 增操作

public int Add(string sql)

{


MySqlConnection conn = null;

MySqlCommand cmd = null;


try

{

conn = base.GetConn();

conn.Open();

cmd = new MySqlCommand(sql, conn);

int i = cmd.ExecuteNonQuery();

conn.Close();

return i;

}

catch (Exception)

{


throw;

}


}

// 修改

public int Change(string sql)

{


MySqlConnection conn = null;

MySqlCommand cmd = null;


try

{

conn = base.GetConn();

conn.Open();

cmd = new MySqlCommand(sql, conn);

int i = cmd.ExecuteNonQuery();

conn.Close();

return i;


}

catch (Exception)

{


throw;

}


}

//删除

public int Delete(string sql)

{


MySqlConnection conn = null;

MySqlCommand cmd = null;


try

{

conn = base.GetConn();

conn.Open();

cmd = new MySqlCommand(sql, conn);

int i = cmd.ExecuteNonQuery();

conn.Close();

return i;


}

catch (Exception)

{


throw;

}


}


}


}

具体使用方法:

//查询

string sql1 = "select max(inumber)+1 as num from income ";//查询sql语句

DataTable dt = mysql.Select(sql1);//放到数据表里

if (dt.Rows.Count > 0)//是否有数据

{

for (int i = 0; i < dt.Rows.Count; i++)

{

ia.textBox_bh.Text = dt.Rows[i]["num"].ToString();//显示到编辑框中

}

}

其他类似,只要把sql语句换一下,就OK了!for里边是做具体的操作,把数据读出来,放到哪里,或者删除,或者修改,你做主!


对了,我用的是MYSQL.data来连接数据库的,所以需要using MySql.Data.MySqlClient;//导入用MySql的包,这就话!还需要把MySql.Data.dll先导入到C#项目的应用中去!控件下载地址;http://download.csdn.net/my

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