Node.js操作mysql数据库之增删改查 js操作数据库实现注册和登陆

原文地址：https://www.cnblogs.com/kongxianghai/p/5335632.html

安装mysql模块

npm install mysql

数据库准备

mysql server所在的机器IP地址是192.168.0.108，登录账户就用root@123456

在mysql中创建test数据库

在test数据库中创建一张users表

操作

连接数据库

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var mysql=require('mysql');

var connection = mysql.createConnection({
    host     : '192.168.0.108',
    user     : 'root',
    password : '123456',
    database : 'test1',
    port:'3306'
});

connection.connect();

插入一个user

var usr={name:'zhangsan',password:'pwdzhangsan',mail:'[email protected]'};
connection.query('insert into users set ?', usr, function(err, result) {
    if (err) throw err;

    console.log('inserted zhangsan');
    console.log(result);
    console.log('\n');
});

更新user，带条件

connection.query('update users set password="ddd" where name="zhangsan"', {password:'ppp'}, function(err, result) {
    if (err) throw err;

    console.log('updated zhangsan\'s password to ddd');
    console.log(result);
    console.log('\n');
});

删除一个user，带条件

connection.query('delete from  users where name="zhangsan"', {password:'ppp'}, function(err, result) {
    if (err) throw err;

    console.log('deleted zhangsan');
    console.log(result);
    console.log('\n');
});

查询user，所有

connection.query('select * from users', function(err, rows, fields) {
    if (err) throw err;

    console.log('selected after deleted');
    for(var i= 0,usr;usr=rows[i++];){
        console.log('user nae='+usr.name + ', password='+usr.password);
    }

    console.log('\n');

});

关闭数据库连接

connection.end();

基本的CRUD完成

mysql模块的完整功能说明参见官方：

https://www.npmjs.com/package/mysql

https://github.com/felixge/node-mysql

全部demo代码

var mysql=require('mysql');

var connection = mysql.createConnection({
    host     : '192.168.0.108',
    user     : 'root',
    password : '123456',
    database : 'test1',
    port:'3306'
});

connection.connect();

var usr={name:'zhangsan',password:'pwdzhangsan',mail:'[email protected]'};
connection.query('insert into users set ?', usr, function(err, result) {
    if (err) throw err;

    console.log('inserted zhangsan');
    console.log(result);
    console.log('\n');
});

connection.query('select * from users', function(err, rows, fields) {
    if (err) throw err;

    console.log('selected after inserted');
    for(var i= 0,usr;usr=rows[i++];){
        console.log('user nae='+usr.name + ', password='+usr.password);
    }

    console.log('\n');
});

connection.query('update users set password="ddd" where name="zhangsan"', {password:'ppp'}, function(err, result) {
    if (err) throw err;

    console.log('updated zhangsan\'s password to ddd');
    console.log(result);
    console.log('\n');
});

connection.query('select * from users', function(err, rows, fields) {
    if (err) throw err;

    console.log('selected after updated');
    for(var i= 0,usr;usr=rows[i++];){
        console.log('user nae='+usr.name + ', password='+usr.password);
    }

    console.log('\n');
});

connection.query('delete from  users where name="zhangsan"', {password:'ppp'}, function(err, result) {
    if (err) throw err;

    console.log('deleted zhangsan');
    console.log(result);
    console.log('\n');
});

connection.query('select * from users', function(err, rows, fields) {
    if (err) throw err;

    console.log('selected after deleted');
    for(var i= 0,usr;usr=rows[i++];){
        console.log('user nae='+usr.name + ', password='+usr.password);
    }

    console.log('\n');

});

connection.end();

 另外实例参考：js操作数据库实现注册和登陆