用node和express连接mysql实现登录注册的实现代码

var express = require('express');
var user = require('./controll/user'); 

var app = new express();

app.use(express.static('public')); //静态资源的入口
app.use('/user',user);    //这样写是为了以后如果改变了请求路径，也不用改逻辑js而是改这行的路径即可

var server = app.listen(3000)

$("#signup").click(function(){
  $.ajax({
   url: "/user/signup",
   type: 'post',
   data: $("#formid").serialize(),
   success: function(data) {
    if(data.status == 99999) {
     alert("3秒后跳转到首页");
     setTimeout(function() {
      location.href='http://'+window.location.host+'/html/index.html';
     },3000)
    }else {
     alert('登录名或密码错误')
    }
   }
  })  
 })


 $("#register").click(function(){
  $.ajax({
   url: "/user/register",
   type: 'post',
   data: $("#formRegister").serialize(),
   success: function(data) {
    console.log(data);
    if(data.status == 99999) {
     alert("注册成功")
    }else {
     alert("登录名已经有人用")
    }
   }
  })  
 })

var mysql = require('mysql');
var express = require('express');
var bodyParser = require('body-parser');
var cookieParser = require('cookie-parser');
var session = require('cookie-session');

function select(sql) {
 var promise = new Promise(function(resolve,reject) {
  var result = null;
  var mysql = require('mysql');
  var connection = mysql.createConnection({
   host: 'localhost',
   user: 'root',
   password: 'root'
  });

  connection.connect();
  connection.query("USE test");
  connection.query(sql, function (err, results, fields) { 
   if (err) { 
    console.log("err");
    reject(err); 
   }else {
    console.log("yes");
    if(results.length > 0) {
     resolve({status: 99999});
    }else {
     resolve({status: 00000});
    }   
   } 
   } 
  );
  connection.end(); 
 })

 return promise; 
}


var router = express.Router();
router.use(bodyParser.urlencoded({ extended: true }));
router.use(cookieParser())
router.use(session({
 secret: 'blog'
}))
router.use(function timeLog(req,res,next) {
 var _user = req.session.user;
 if(_user) {
  //router.locals.user = user;
 }
 next();
})

//登录
router.post('/signup',function(req, res) {
 var _user = req.body.user;
 var name = _user.name;
 var password = _user.password;
 select('SELECT * FROM name WHERE name = "'+ name + '" AND password = "' + password + '";').then(function(data) {
  //session存user name和userid
  req.session.user = name;
  data.status > 50 ? data.url = '/html/index.html' : null;
  res.json(data);
  res.end();
  req.redirect("/");
 }).catch(function(err){})

})

//注册
router.post('/register',function(req, res) {
 var _user = req.body.user;
 var name = _user.name;
 var password = _user.password;
 console.log(name+"  "+password)
 select('SELECT * FROM name WHERE name = "'+ name + '";')
  .then(function(data) {
   if(data.status == 99999) {
    console.log("已有此用户名")
    res.json({status:00000});
    res.end();
   }else {
    select('INSERT INTO name(name,password) VALUES ("'+name+'", "'+password+'");')
    .then(function(data) { 
     res.json({status:99999});
     res.end();
    }).catch(function(err){})
   }   
  }).catch(function(err){

  })

});

//退出
router.get("/logout",function(req, res) {
 delete req.session.user;
 res.end();
})

//获取session
router.get("/session",function(req, res) {
 console.log("user in session");
 console.log(req.session.user);
 res.json({user:req.session.user});
 res.end();
})

module.exports = router;