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

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:‘zhangsan@gmail.com‘};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:‘zhangsan@gmail.com‘};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