Nodejs 第三十七章（mysql2）

在之前的篇章中，已经补充完成mysql的基本知识，那么现在开始，我们需要把mysql和express,nodejs连接起来。

安装依赖

sh 复制代码

npm install mysql2 express js-yaml

mysql2 用来连接mysql和编写sq语句
express 用来提供接口增删改差
js-yaml 用来编写配置文件

编写代码

db.ocnfig.yaml

yaml 复制代码

db:
   host: localhost #主机
   port: 3306 #端口
   user: root #账号
   password: '123456' #密码 一定要字符串
   database: xiaoman # 库

index.js

js 复制代码

import mysql2 from 'mysql2/promise';
import express from 'express';
import jsYaml from 'js-yaml'
import fs from 'node:fs'
const yamlInfo = fs.readFileSync('./db.config.yaml')
const config = jsYaml.load(yamlInfo)
const sql = await mysql2.createConnection({
    ...config.db
});

const app = express();
app.use(express.json());
//查询全部
app.get('/', async (req, res) => {
    const [rows] = await sql.query('select * from user');
    res.send(rows)
})
//单个查询
app.get('/user/:id', async (req, res) => {
    const [rows] = await sql.query('select * from user where id = ?', [req.params.id]);
    res.send(rows)
})
//创建
app.post('/create', async (req, res) => {
    const { name, age, hobby } = req.body;
    const [rows] = await sql.query('insert into user (name, age, hobby) values (?, ?, ?)', [name, age, hobby]);
    res.send(rows)
})
//更新
app.post('/update', async (req, res) => {
    const { id, name, age, hobby } = req.body;
    const [rows] = await sql.query('update user set name = ?, age = ?,hobby = ? where id = ?', [name, age, hobby, id]);
    res.send(rows)
})


const port = 3000;
app.listen(port, () => {
    console.log(`server is running at http://localhost:${port}`);
})

index.http

方便测试接口

http 复制代码

# 查询全部
 GET http://localhost:3000/ HTTP/1.1

# 单个查询
GET http://localhost:3000/user/2 HTTP/1.1

# 添加数据
POST http://localhost:3000/create HTTP/1.1
Content-Type: application/json

{
    "name":"张三",
    "age":18
}

# 更新数据
POST http://localhost:3000/update HTTP/1.1
Content-Type: application/json

{
    "name":"法外狂徒",
    "age":20,
    "id":23
}

后续更新计划