Node. js: add, delete, modify, and query _ node. js for mysql database operations

This article mainly introduces how to use Node. js to operate the mysql database for addition, deletion, modification, and query. If you need more information, please read the full text. The details are as follows:

Install the mysql Module

npm install mysql 

Database preparation

The IP address of the machine where mysql server is located is 192.168.0.108. to log on to the account, use root @ 123456.

Create a test database in mysql

Create a users table in the test Database

Operation

Connect to database

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

Insert a 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');});

Update user with conditions

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');}); 

Delete a user with conditions

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');});

Query user, all

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');}); 

Close database connection

Connection. end ();

Basic CRUD completed

For a complete description of the functions of the mysql module, see the official website:

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

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

All demo code

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();