Node.js + Express + Mysql
1、项目：expressEjsWeb
express -e expressEjsWeb
cd expressEjsWeb&& npm install
2、数据库：mysql
CREATE DATABASE IF NOT EXISTS learn_nodejs CHARACTER SET UTF8;
USE learn_nodejs;
SET FOREIGN_KEY_CHECKS=0;
DROP TABLE IF EXISTS `userinfo`;
CREATE TABLE `userinfo` (
`Id` int(11) NOT NULL AUTO_INCREMENT COMMENT '主键',
`UserName` varchar(64) NOT NULL COMMENT '用户名',
`UserPass` varchar(64) NOT NULL COMMENT '用户密码',
PRIMARY KEY (`Id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='用户信息表';
3.修改package.json文件,安装session和mysql模块
"express-session" : "latest",
"mysql" : "latest"
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npm install
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这几行代码别忘记添加，之前已经添加过。
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4.样式和JQuery文件
样式：样式主要使用了bootstrap 3.0.3 https://github.com/twbs/bootstrap/releases/tag/v3.0.3
JQuery: jquery-1.6.2.min http://jquery.com/download/
对应目录结构：
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路由配置
1.路由
首页：/
注册页：/reg
登录页：/login
安全退出：/logout
2.routes目录下新建如下文件
reg.js
login.js
logout.js
3.views目录下新建：
header.ejs
reg.ejs
login.ejs
4.打开app.js文件，添加代码
...
var routes = require('./routes/index');
var reg = require('./routes/reg');
var login = require('./routes/login');
var logout = require('./routes/logout');
...
app.use('/', routes);
app.use('/reg', reg);
app.use('/login', login);
app.use('/logout', logout);
...
实现登录和注册
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user.js
var mysql = require('mysql');
var DB_NAME = 'learn_nodejs';
var pool = mysql.createPool({
host : '192.168.41.36',
user : 'root',
password : 'admin'
});
pool.on('connection', function(connection) {
connection.query('SET SESSION auto_increment_increment=1');
});
function User(user){
this.username = user.username;
this.userpass = user.userpass;
};
module.exports = User;
pool.getConnection(function(err, connection) {
var useDbSql = "USE " + DB_NAME;
connection.query(useDbSql, function (err) {
if (err) {
console.log("USE Error: " + err.message);
return;
}
console.log('USE succeed');
});
//保存数据
User.prototype.save = function save(callback) {
var user = {
username: this.username,
userpass: this.userpass
};
var insertUser_Sql = "INSERT INTO userinfo(id,username,userpass) VALUES(0,?,?)";
connection.query(insertUser_Sql, [user.username, user.userpass], function (err,result) {
//报错修改地方
connection.release();
if (err) {
console.log("insertUser_Sql Error: " + err.message);
return;
}
//connection.release();
console.log("invoked[save]");
callback(err,result);
});
};
//根据用户名得到用户数量
User.getUserNumByName = function getUserNumByName(username, callback) {
var getUserNumByName_Sql = "SELECT COUNT(1) AS num FROM userinfo WHERE username = ?";
connection.query(getUserNumByName_Sql, [username], function (err, result) {
//报错修改地方
connection.release();
if (err) {
console.log("getUserNumByName Error: " + err.message);
return;
}
//connection.release();
console.log("invoked[getUserNumByName]");
callback(err,result);
});
};
//根据用户名得到用户信息
User.getUserByUserName = function getUserNumByName(username, callback) {
var getUserByUserName_Sql = "SELECT * FROM userinfo WHERE username = ?";
connection.query(getUserByUserName_Sql, [username], function (err, result) {
//报错修改地方
connection.release();
if (err) {
console.log("getUserByUserName Error: " + err.message);
return;
}
//connection.release();
console.log("invoked[getUserByUserName]");
callback(err,result);
});
};
});
注册
reg.ejs
<%= title %>
<% if (locals.success) { %>
<%- success %>
<% } %>
<% if (locals.error) { %>
<%= error %>
<% } %>
实现注册功能（reg.js）
var express = require('express'),
router = express.Router(),
User = require('../models/user.js'),
crypto = require('crypto'),
TITLE_REG = '注册';
router.get('/', function(req, res) {
res.render('reg',{title:TITLE_REG});
});
router.post('/', function(req, res) {
var userName = req.body['txtUserName'],
userPwd = req.body['txtUserPwd'],
userRePwd = req.body['txtUserRePwd'],
md5 = crypto.createHash('md5');
userPwd = md5.update(userPwd).digest('hex');
var newUser = new User({
username: userName,
userpass: userPwd
});
//检查用户名是否已经存在
User.getUserNumByName(newUser.username, function (err, results) {
if (results != null && results[0]['num'] > 0) {
err = '用户名已存在';
}
if (err) {
res.locals.error = err;
res.render('reg', { title: TITLE_REG });
return;
}
newUser.save(function (err,result) {
if (err) {
res.locals.error = err;
res.render('reg', { title: TITLE_REG });
return;
}
if(result.insertId > 0)
{
res.locals.success = '注册成功,请点击 登录 ' ;
}
else
{
res.locals.error = err;
}
res.render('reg', { title: TITLE_REG });
});
});
});
module.exports = router;
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运行：
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报错：
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修改代码：
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......
//保存数据
User.prototype.save = function save(callback) {
var user = {
username: this.username,
userpass: this.userpass
};
var insertUser_Sql = "INSERT INTO userinfo(id,username,userpass) VALUES(0,?,?)";
connection.query(insertUser_Sql, [user.username, user.userpass], function (err,result) {
if (err) {
console.log("insertUser_Sql Error: " + err.message);
return;
}
//connection.release();
console.log("invoked[save]");
callback(err,result);
//报错修改地方
connection.release();
});
};
......
显示：
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到这里，注册功能完成！
登录后首页
header.ejs
index.ejs
<%= title %>
<% include header %>
index.js
var express = require('express'),
router = express.Router();
router.get('/', function(req, res) {
if(req.cookies.islogin)
{
console.log('cookies:' + req.cookies.islogin);
req.session.username = req.cookies.islogin;
}
if(req.session.username)
{
console.log('session:' + req.session.username);
res.locals.username = req.session.username;
}
else
{
res.redirect('/login');
return;
}
res.render('index',{title:'主页'});
});
module.exports = router;
登录
login.ejs
<%= title %>
<% if (locals.success) { %>
<%- success %>
<% } %>
<% if (locals.error) { %>
<%= error %>
<% } %>
login.js
var express = require('express'),
router = express.Router(),
User = require('../models/user.js'),
crypto = require('crypto'),
TITLE_LOGIN = '登录';
router.get('/', function(req, res) {
res.render('login',{title:TITLE_LOGIN});
});
router.post('/', function(req, res) {
var userName = req.body['txtUserName'],
userPwd = req.body['txtUserPwd'],
isRem = req.body['chbRem'],
md5 = crypto.createHash('md5');
User.getUserByUserName(userName, function (err, results) {
if(results == '')
{
res.locals.error = '用户不存在';
res.render('login',{title:TITLE_LOGIN});
return;
}
userPwd = md5.update(userPwd).digest('hex');
if(results[0].UserName != userName || results[0].UserPass != userPwd)
{
res.locals.error = '用户名或密码有误';
res.render('login',{title:TITLE_LOGIN});
console.log(1);
return;
}
else
{
if(isRem)
{
res.cookie('islogin', userName, { maxAge: 60000 });
}
res.locals.username = userName;
req.session.username = res.locals.username;
console.log(req.session.username);
res.redirect('/');
return;
}
});
});
module.exports = router;
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运行：
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登录成功后，
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对于连接经常中断问题
参考网上说明修改：
http://www.2cto.com/kf/201404/292016.html
有待实践。