json、jsonp/** * 后台接口开发 * json接口 * jsonp接口(解决跨域问题) * restful接口 */const express = require('express');const db = require('./db');const app = express();//指定api路径allBooks//JSON接口//调用：http://localhost:3000/allBook// app.get('/allBook',(req,res)=>{// let sql = 'select * from book';//
restful/** * restful api 是从URL的格式来表述的 * get http://localhost:3000/books * get http://localhost:3000/books/book * post http://localhost:3000/books/book * get http://localhost:3000/books/book/1 * put http://localhost:3000/books/book * delete http://localhost:3000/books/book/2 * * * * 传统的URL风格 * http://localhost:3000 * http://localhost:3000/toAddBook * http://localhost:3000/addBook * http://localhost:3000/toEditBook?id=1 * http://localhost:3000/editBook * http://localhost:3000/deleteBook?id=2 * */const express = require('express');const app = express();const db = require('./db');//查询全部app.get('/books',(req,res)=>{ let sql = 'select * from book'; db.base(sql,null,(result)=>{ res.json(result); });});//查询指定//http://localhost:3000/books/book/1app.get('/books/book/:id',(req,res)=>{ let id = req.params.id; let sql = 'select * from book where id =?'; let data = [id]; db.base(sql,data,(result)=>{ res.json(result); });});app.listen(3000,()=>{ console.log('服务启动……');});
db.js/* 封装通用数据库通用api */const mysql = require('mysql');/** * * @param sql * @param data * @param callback */exports.base = (sql, data, callback) => { /* 操作数据库基本步骤 */ //创建数据库连接 const connection = mysql.createConnection({ host: 'localhost', //数据库所在的服务器的域名或者IP地址 user: 'root',//用户名 password: 'admin',//密码 database: 'book', //数据库 port: '4406' //端口号 });//执行连接操作 connection.connect();//操作数据库 connection.query(sql, data, function (error, results, fields) { if (error) throw error; callback(results); });//关闭数据库 connection.end();}
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