Nodejs学习笔记（七）--- Node.js + Express + Mysql

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。

image.png

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：

image.png

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

image.png

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

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">       
    <title><%= title %></title>
  
    <link rel="stylesheet" type="text/css" href="/stylesheets/bootstrap.min.css" />
    <link rel="stylesheet" type="text/css" href="/stylesheets/signin.css" />
  </head>

  <body>

    <div id="container" class="container">
       <% if (locals.success) { %> 
          <div id="alt_sucess" class="alert alert-success"> 
            <%- success %> 
          </div> 
       <% } %> 

      <% if (locals.error) { %> 
        <div id="alt_warning" class="alert alert-warning"> 
          <%= error %> 
        </div> 
      <% } %> 

      <form class="form-signin" role="form" method="post">
        <h2 class="form-signin-heading">注册</h2>

        <input id="txtUserName" name="txtUserName" type="text" class="form-control" placeholder="用户名" required autofocus />
        <input id="txtUserPwd" name="txtUserPwd" type="password" class="form-control" placeholder="密码" required/>
        <input id="txtUserRePwd"  name="txtUserRePwd" type="password" class="form-control" placeholder="重复密码" required/>   

        <button id="btnSub" class="btn btn-lg btn-primary" type="submit">注  册</button>
        <a class="btn btn-link" href="/login" role="button">登  录</a>
      </form>  
      
    </div> 
  </body>
</html>

<script src="/javascripts/jquery-1.6.2.min.js" type="text/javascript"></script>

<script type="text/javascript">
     String.prototype.format = function (args) {
            var result = this;
            if (arguments.length > 0) {
                if (arguments.length == 1 && typeof (args) == "object") {
                    for (var key in args) {
                        if (args[key] != undefined) {
                            var reg = new RegExp("({" + key + "})", "g");
                            result = result.replace(reg, args[key]);
                        }
                    }
                }
                else {
                    for (var i = 0; i < arguments.length; i++) {
                        if (arguments[i] != undefined) {
                            var reg = new RegExp("({)" + i + "(})", "g");
                            result = result.replace(reg, arguments[i]);
                        }
                    }
                }
            }
            return result;
    }

    $(function(){
        $('#btnSub').on('click',function(){
            var 
            $txtUserName = $('#txtUserName'),
            txtUserNameVal = $.trim($txtUserName.val()),            
            $txtUserPwd = $('#txtUserPwd'),
            txtUserPwdVal = $.trim($txtUserPwd.val()),
            $txtUserRePwd = $('#txtUserRePwd'),
            txtUserRePwdVal = $.trim($txtUserRePwd.val()),
            errorTip = '<div id="errorTip" class="alert alert-warning">{0}</div> ';

            $("#errorTip,#alt_sucess,#alt_warning").remove();
            
            if(txtUserNameVal.length == 0)
            {
                $("#container").prepend(errorTip.format('用户名不能为空'));                
                $txtUserName.focus();
                return false;
            }

            if(txtUserPwdVal.length == 0)
            {                
                $("#container").prepend(errorTip.format('密码不能为空'));
                $txtUserPwd.focus();
                return false;
            }

            if(txtUserRePwdVal.length == 0)
            {
                $("#container").prepend(errorTip.format('重复密码不能为空'));                
                $txtUserRePwd.focus();
                return false;
            }

            if(txtUserPwdVal != txtUserRePwdVal)
            {                 
                 $("#container").prepend(errorTip.format('两次密码不一致'));      
                 $txtUserPwd.focus();
                 return false;
            }

            return true;
        })
    });

</script>

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   <a class="btn btn-link" href="/login" role="button"> 登录 </a>' ;
          }
          else
          {
              res.locals.error = err;
          }
         
          res.render('reg', { title: TITLE_REG });
          });    
    });          
});

module.exports = router;

image.png

运行：

image.png

报错：

image.png

修改代码：

image.png

......
  //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：

image.png

到这里，注册功能完成！

登录后首页

header.ejs

<div class="navbar navbar-default navbar-static-top" role="navigation">
  <div class="container">
    <div class="navbar-header">         
      <a class="navbar-brand" href="/">Tiany - Nodejs + Express + Ejs + MySQL 示例</a>
    </div>
    <div class="navbar-collapse collapse">
      <ul class="nav navbar-nav navbar-right">

        <% if (locals.username) { %> 
          <li><a href="#">        
                <%= username %>          
          </a></li>
          <li><a href="/logout">退出</a></li> 
        <% } %>           
      </ul>
    </div>              
  </div>
</div>

index.ejs

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">           
      <title><%= title %></title>
    <link rel="stylesheet" type="text/css" href="/stylesheets/bootstrap.min.css" />
    <link rel="stylesheet" type="text/css" href="/stylesheets/navbar-static-top.css" />   
  </head>
  <body>
      <% include header %> 
  </body>
</html>

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;

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">       
    <title><%= title %></title>
  
  <link rel="stylesheet" type="text/css" href="/stylesheets/bootstrap.min.css" />
    <link rel="stylesheet" type="text/css" href="/stylesheets/signin.css" />
  </head>

  <body>

    <div id="container" class="container">
       <% if (locals.success) { %> 
          <div id="alt_sucess" class="alert alert-success"> 
            <%- success %> 
          </div> 
       <% } %>  

      <% if (locals.error) { %> 
        <div id="alt_warning" class="alert alert-warning"> 
          <%= error %> 
        </div> 
      <% } %> 

      <form class="form-signin" role="form" method="post">
        <h2 class="form-signin-heading">登录</h2>
        <input id="txtUserName" name="txtUserName" type="text" class="form-control" placeholder="用户名" required autofocus />
            <input id="txtUserPwd" name="txtUserPwd" type="password" class="form-control" placeholder="密码" required/> 
        <label class="checkbox">
          <input name="chbRem" id="chbRem" type="checkbox" value="remember-me"> 记住密码
        </label>              
        <button id="btnSub" class="btn btn-lg btn-primary" type="submit">登  录</button>
        <a class="btn btn-link" href="/reg" role="button">注  册</a>

      </form>
            
    </div> 
  </body>
</html>

<script src="/javascripts/jquery-1.6.2.min.js" type="text/javascript"></script>

<script type="text/javascript">
     String.prototype.format = function (args) {
            var result = this;
            if (arguments.length > 0) {
                if (arguments.length == 1 && typeof (args) == "object") {
                    for (var key in args) {
                        if (args[key] != undefined) {
                            var reg = new RegExp("({" + key + "})", "g");
                            result = result.replace(reg, args[key]);
                        }
                    }
                }
                else {
                    for (var i = 0; i < arguments.length; i++) {
                        if (arguments[i] != undefined) {
                            var reg = new RegExp("({)" + i + "(})", "g");
                            result = result.replace(reg, arguments[i]);
                        }
                    }
                }
            }
            return result;
    }

    $(function(){
        $('#btnSub').on('click',function(){           
            var 
            $txtUserName = $('#txtUserName'),
            txtUserNameVal = $.trim($txtUserName.val()),            
            $txtUserPwd = $('#txtUserPwd'),
            txtUserPwdVal = $.trim($txtUserPwd.val()),
            errorTip = '<div id="errorTip" class="alert alert-warning">{0}</div> ';  

            $("#errorTip,#alt_warning").remove();
            
            if(txtUserNameVal.length == 0)
            {
                $("#container").prepend(errorTip.format('用户名不能为空'));                
                $txtUserName.focus();
                return false;
            }

            if(txtUserPwdVal.length == 0)
            {                
                $("#container").prepend(errorTip.format('密码不能为空'));
                $txtUserPwd.focus();
                return false;
            }
            
            return true;                
        })
    });

</script>

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;