Nodejs操作MySQL数据库

Posted 2020-11-16 漫思

  如何用nodejs操作mysql数据呢，其实写法还是简单的，

     1.开始在你的node项目中 npm install mysql --save

     2.在你的新建项目中 引入代码

      

//引入数据库
var mysql=require(‘mysql‘);

//实现本地链接
var connection = mysql.createConnection({
    host: ‘localhost‘,
    user: ‘yf‘,
    password: ‘123456‘,
    database: ‘yf‘
})

 

   最好不好是用root 会产生冲突

 3. 之后就是增删改查啦，附上代码

       查询

 

     

// 查找
function select() {
    connection.connect(function (err) {
        if (err) {
            console.error(‘error connecting:‘ + err.stack)
        }
        console.log(‘connected as id ‘ + connection.threadId);
    })

    connection.query(‘SELECT * FROM demo‘, function (error, results, fields) {
        if (error) throw error;
        console.log(‘The solution is:‘, results);
    });
    connection.end();
}

     添加

//添加
function add() {
    let post = {
        id: 1,
        name: ‘Hello MySql‘,
        age: 20,
        time: Date.now(),
        temp: ‘deom‘
    };
    let query = connection.query("INSERT INTO demo SET ?", post, function (error, results, fields) {
        if (error) throw error;
    })
    console.log(query.sql); //INSERT INTO posts ‘id‘=1, ‘title‘=‘Hello MySQL‘
}

  修改

//修改
function updeate() {
    connection.connect(function (err) {
        if (err) {
            console.error(‘error connecting:‘ + err.stack);
        }
        console.log(‘connected as id ‘ + connection.threadId);
    });

    connection.query(‘UPDATE demo SET name=?where id?‘, [‘update‘, 1], function (error, results, fields) {
        if (error) throw error;
        console.log(‘changed:‘ + results.changeRows + ‘rows‘);
    });

    connection.end();

}

  删除

 

//删除
function deletes() {
    connection.connect(function (err) {
        if (err) {
            console.error(‘error connecting:‘ + err.stack);
            return;
        }
        connection.query(‘DELETE FROM demo SET where id=?‘, [ 1], function (error, results, fields) {
            if (error) throw error;
            console.log(‘deleted:‘ + results.affectedRows + ‘rows‘);
        });
        console.log(‘connected as id ‘ + connection.threadId);
        connection.end();

    });

}

 

  是不是很简单啊 只要在你需要的地方添加方法名和对应的参数 ，就可以了