express搭建查詢服務器

service
--node_modules
--app.js
--query.js

var express = require('express');
var query = require('./query')
var bodyParser = require('body-parser');
var cookieParser = require('cookie-parser');
var app = express();
app.use(bodyParser.urlencoded({ extended: false }))//返回的對象是一個鍵值對，當extended為false的時候，鍵值對中的值就為'String'或'Array'形式，為true的時候，則可為任何數據類型。
app.use(bodyParser.json())
//跨域支持
app.all('*', function(req, res, next) {
 res.header("Access-Control-Allow-Origin", "*");
 res.header('Access-Control-Allow-Methods', 'PUT, GET, POST, DELETE, OPTIONS');
 res.header("Access-Control-Allow-Headers", "X-Requested-With");
 res.header('Access-Control-Allow-Headers', 'Content-Type');
 next();
});
//登錄
app.post('/login',(req,res)=>{
 var opts = req.body;
 query(" SELECT *FROM `v_users` WHERE userAcount = ?",opts.userName).then((result)=>{
 var response = result[0];
 if(opts.password !== response.u_password){
 return res.send({
 errorCode:'404',
 errorMsg:'登錄密碼錯誤'
 })
 }
 //模擬生成loginToken
 var loginToken = response.userAcount + Math.random()*Math.pow(10,16)
 res.send({
 loginToken:loginToken
 })
 })
})
var server = app.listen(3000,()=>{
 console.log('success')
})

(function() {
 var mysql = require('mysql');
 // var session = require('cookie-session');
 var query = (sql,key) => {
 var connection = mysql.createConnection({
 host: 'localhost',
 user: 'root',
 password: 'root123',
 database: 'm_users'
 });
 connection.connect()
 var promise = new Promise((resolve,reject)=>{
 connection.query(sql,[key], function(error, results, fields) {
 if(error){
 reject(error)
 }else{
 resolve(results);
 }
 });
 connection.end();
 });
 return promise;
 }
 module.exports = query;
})()