node.js连接MySQL

node.js操作mysql相关详细API：https://github.com/mysqljs/mysql

步骤一：准备好node环境

初始化环境 npm init，安装express并引入express

步骤二：安装mysql

npm install mysql --save

//app.js

const express=require('express');

const mysql=require('mysql');

const app=express();

//创建连接

const connection = mysql.createConnection({

  host    : 'localhost',

  user    : 'me',

  password : 'secret',

  database : 'my_db'

});

connection.connect((err)=>{

if(err)  throw err;

console.log('mysql is conected');

});

// 创建数据库

app.get('/createdb', (req, res) => {

  let sql = 'CREATE DATABASE nodemysql';

  db.query(sql, (err, result) => {

    if (err) throw err;

    console.log(result);

    res.send('Database created...');

  });

});

// 创建表

app.get('/createpoststable', (req, res) => {

  let sql =

    'CREATE TABLE posts(id int AUTO_INCREMENT,title VARCHAR(255),body VARCHAR(255), PRIMARY KEY(id))';

  db.query(sql, (err, result) => {

    if (err) throw err;

    console.log(result);

    res.send('posts表已经建立...');

  });

});

// 插入内容

app.get('/addpost1', (req, res) => {

  let post = { title: 'post one', body: 'this is post one' };

  let sql = 'INSERT INTO posts SET ?';

  db.query(sql, post, (err, result) => {

    if (err) throw err;

    console.log(result);

    res.send('post 1 added....');

  });

});

// 查询内容

app.get('/getposts', (req, res) => {

  let sql = 'SELECT * FROM posts';

  db.query(sql, (err, result) => {

    if (err) throw err;

    console.log(result);

    res.json(result);

  });

});

// 查询单条内容

app.get('/getpost/:id', (req, res) => {

  let sql = `SELECT * FROM posts WHERE id = ${req.params.id}`;

  db.query(sql, (err, result) => {

    if (err) throw err;

    console.log(result);

    res.json(result);

  });

});

// 更新内容

app.get('/updatepost/:id', (req, res) => {

  let newTitle = 'update title';

  let sql = `UPDATE posts SET title = '${newTitle}' WHERE id = ${req.params.id}`;

  db.query(sql, (err, result) => {

    if (err) throw err;

    console.log(result);

    res.json('更新成功...');

  });

});

// 删除内容

app.get('/deletepost/:id', (req, res) => {

  let sql = `DELETE FROM posts WHERE id = ${req.params.id}`;

  db.query(sql, (err, result) => {

    if (err) throw err;

    console.log(result);

    res.json('删除成功....');

  });

});

app.listen(3000,()=>{

    console.log('server started on 3000');

});