nodejs使用案例-mysql操作

Posted 2020-09-08 jake-前端工程师

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1、package.json:

{
  "scripts": {
    "start": "node app.js"
  },
  "devDependencies": {
    "body-parser": "^1.17.1",
    "ejs": "^2.5.6",
    "express": "^4.15.2",
    "express-session": "^1.15.1",
    "mysql": "^2.13.0",
    "session": "^0.1.0"
  }
}

2、db.js:

var mysql = require(‘mysql‘);//导入mysql模块
var db=mysql.createConnection({ //连接mysql数据库
	host:‘localhost‘,
	user:‘root‘,
	password:‘123456‘,
	database:‘test‘,  //数据库名字
	port:3306
});
db.connect((err)=>{
	if(err){
		console.log(‘connect fail‘)
	}else{
		console.log(‘connect suc‘)
	}
});
module.exports=db;

3、app.js:

var express = require(‘express‘);
var app = express();
var gets = require(‘./modle.js‘);
var bodyParser = require(‘body-parser‘);
var session = require(‘express-session‘)
app.use(session({
	secret: ‘shixinke‘,
	resave: true,
	saveUninitialized: false,
	cookie: {
		secure: false
	}
})); //这部分代码可以让你使用session
app.engine(‘.html‘, require(‘ejs‘).__express);
app.set(‘view engine‘, ‘html‘);
app.set(‘views‘, __dirname + ‘/views‘); //模板引擎启用
app.use(bodyParser.json());
app.use(bodyParser.urlencoded());  //这部分可以让你使用接收post数据
app.get(‘/‘, function(req, res, next) { //路由，然后调用相应的modle.js里的方法
	gets.showArticleHome(req, res, next)
})
app.get(‘/login‘, function(req, res, next) {
	res.render(‘login‘);
})
app.get(‘/outlogin‘, function(req, res, next) {
	req.session.sign = false;
	res.redirect(‘/‘);
})
app.post(‘/loginif‘, function(req, res, next) {
	gets.loginif(req, res, next);
})
app.set(‘trust proxy‘, 1) // trust first proxy

app.get(‘/list‘, function(req, res, next) {
	if (req.session.sign) {
		gets.showArticle(req, res, next)
	} else {
		res.send(‘you don,t have login‘)
	}
})
app.get(‘/article/:id‘, function(req, res, next) {
	gets.showArticleInfo(req, res, next)
})

app.get(‘/write‘, function(req, res, next) {
	gets.subForm(req, res, next)
})
app.post(‘/subform‘, function(req, res, next) {
	gets.saveArticle(req, res, next);
})
app.get(‘/delete/:id‘, function(req, res, next) {
	gets.deleteArticle(req, res, next);
})
app.get(‘/edit/:id‘, function(req, res, next) {
	if (req.session.sign) {
		gets.editArticle(req, res, next);
	}else{
		res.send(‘you don,t have login in‘)
	}
})
app.post(‘/update‘, function(req, res, next) {
	gets.updateArticle(req, res, next);
})
app.listen(8000)

4、modle.js:

var db = require(‘./db.js‘);
var gets = {};
gets.loginif=(req,res,next)=>{
	var userInfo=req.body.userinfo;
	console.log(userInfo,‘sdflksjfd‘)
	var qry="select count(*) as num from admin where user=‘"+userInfo.user+"‘ and password=‘"+userInfo.psd+"‘";
	db.query(qry,function(err,result){
		if(err){
			console.log(‘err‘);
			return;
		}
		if(result[0].num>=1){
			req.session.sign = true;
		}
		res.send(result)
	})
}
gets.findAll = (req, res, next) => {
	var qry = "select * from user";
	var qry2 = "select * from user_next";
	db.query(qry, function(err, result) {
		if (err) {
			console.log(‘err‘);
			return;
		}
		db.query(qry2, function(err, result2) {
			res.render(‘home‘, {
				data: result,
				data2: result2,
				title: ‘home‘
			});
		})
	});
}
gets.subForm = (req, res, next) => {
	res.render(‘write‘, {})
}

gets.showArticle = (req, res, next) => {
	db.query(‘select * from article‘, function(err, result) {
		if (err) {
			console.log(‘not get article‘)
			return;
		}
		res.render(‘list‘, {
			data: result
		})
	})
}
gets.showArticleHome = (req, res, next) => {
	db.query(‘select * from article‘, function(err, result) {
		if (err) {
			console.log(‘not get article‘)
			return;
		}
		res.render(‘home‘, {
			data: result
		})
	})
}
gets.showArticleInfo = (req, res, next) => {
	var id = req.params.id;
	db.query("select * from article where id=" + id + "", function(err, result) {
		if (err) {
			console.log(‘not get article‘)
			return;
		}
		res.render(‘info‘, {
			data: result
		})
	})
}
gets.saveArticle = (req, res, next) => {
	var formdata = req.body.formdata;
	console.log(typeof(formdata.tit));
	var str = formdata.con;
	str = str.replace(/\"/g, " ");
	str = str.replace(/"/g, "‘");
	str = str.replace(/&/g, "");
	str = str.replace(/lt;/g, "<");
	str = str.replace(/gt;/g, ">");
	str = str.replace(/\&/g, "");
	str = str.replace(/\n/g, "<br>");
	var qry = "insert into article (title,content) values (‘" + formdata.tit + "‘, ‘" + str + "‘)";
	db.query(qry, function(err, result) {
		if (err) {
			console.log(‘err‘)
			return;
		}
		res.send({
			state: true
		})
	})
}
gets.updateArticle = (req, res, next) => {
	var formdata = req.body.formdata;
	var str = formdata.con;
	str = str.replace(/\"/g, " ");
	str = str.replace(/"/g, "‘");
	str = str.replace(/&/g, "");
	str = str.replace(/lt;/g, "<");
	str = str.replace(/gt;/g, ">");
	str = str.replace(/\&/g, "");
	str = str.replace(/\n/g, "<br>");
	var qry = "update article set title=‘"+formdata.tit+"‘,content=‘"+str+"‘ where id=‘"+req.body.id+"‘";
	db.query(qry, function(err, result) {
		if (err) {
			console.log(‘err‘)
			return;
		}
		res.send({
			state: true
		})
	})
}
gets.deleteArticle = (req, res, next) => {
	var delId=req.params.id;
	var qry="delete from article where id="+delId+"";
	db.query(qry, function(err, result) {
		if (err) {
			console.log(‘err‘)
			return;
		}
		res.redirect(‘/list‘)
	})
}
gets.editArticle = (req, res, next) => {
	var editId=req.params.id;
	console.log(editId,‘dksfdksfj‘)
	var qry="select * from article where id="+editId+"";
	db.query(qry, function(err, result) {
		if (err) {
			console.log(‘err‘)
			return;
		}
		res.render(‘edit‘,{
			data:result
		})
	})
}

module.exports = gets;

5、home.html:

<!DOCTYPE html>
<html>
<head>
	<title>article</title>
</head>
<style type="text/css">
	li{
		display: inline-block;
	}
</style>
<body>
<% data.forEach(function(item){%>
	<a href="article/<%=item.id%>"><li><%=item.title%></li></a><br>
<%})%>

<a href="/login" style="display:block;margin-top: 30px;"><button>login</button></a>
</body>
</html>

6、login.html:

<!DOCTYPE html>
<html>
<head>
	<title>login</title>
</head>
<body>
<div class="user">
	<input class="users" type="text" name="user">
</div>
<div class="password">
	<input class="psd" type="password" name="password">
</div>
<div class="login">
	<button class="login">login</button>
</div>
<div class="tip"></div>

</body>
<script src="http://ajax.aspnetcdn.com/ajax/jquery/jquery-2.1.4.min.js"></script>
<script type="text/javascript">
	$(function(){
		$(‘.login‘).on(‘click‘,function(){
			var user=$(‘.users‘).val();
			var psd=$(‘.psd‘).val();
			var userInfo={
				user:user,
				psd:psd
			}
			console.log(userInfo)
			$.ajax({
					url:‘/loginif‘,
					dataType:‘json‘,
					data:{
						userinfo:userInfo
					},
					type:‘post‘,
					success:function(msg){
						var state=msg[0].num;
						console.log(state)
						if(state>=1){
							window.location.href=‘/list‘
						}else{
							$(‘.tip‘).html(‘name or password wrong‘)
						}
					},
					error:function(err){
						console.log(err)
					}
				})
		})
	})
</script>
</html>

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