简介
数据库原理课程过于枯燥无味。。于是就想做点什么。就做一个用数据库登录和注册的玩意吧。
涉及知识有以下几点，前三个不是重点，主要是数据库方面：
- HTML表单
- CSS
- PHP
- SQL
验证码的部分不用深究，这里只是为了装，由于简要设计，还未考虑SQL注入、密码加密
效果预览
登录和注册页面可以相互跳转，登录成功后成功后显示“登陆成功”，失败则重新输入
代码实现
- 数据库表的实现
-- userforP 的数据库结构
DROP DATABASE IF EXISTS `userforP`;
CREATE DATABASE IF NOT EXISTS `userforP` /*!40100 DEFAULT CHARACTER SET utf8 COLLATE utf8_bin */;
USE `userforP`;
-- 表 userforP.userforP 结构
DROP TABLE IF EXISTS `userforP`;
CREATE TABLE IF NOT EXISTS `userforP` (
`Uname` int(11) NOT NULL COMMENT '用户名',
`Upassword` int(11) NOT NULL COMMENT '密码',
`Ulogtimes` int(10) unsigned zerofill NOT NULL COMMENT '密码错误次数',
PRIMARY KEY (`Uname`,`Upassword`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
- 登录数据库验证
<?php
/**
* 登录验证
*/
$dbhost = "localhost";
$charset = 'utf8';
$dbname = "userforP"; //数据库名称
$dbuser = "Admin2"; //数据库用户名
$dbpass = "123456789"; //数据库密码
$tbname = 'userforP'; //表格名
$name=$_POST['name'];
$password=$_POST['password'];
try
{
$conn = new PDO("mysql:host=$dbhost;dbname=$dbname;charset=$charset", $dbuser, $dbpass);
$sql = "SELECT * FROM userforP where Uname='$name'and Upassword='$password'";
if ( $query = $conn->query($sql) )
{
if($query->rowCount()<1) //如果数据库中找不到对应数据
{
echo"<script type='text/javascript'>alert('账号或密码错误'); location='sign.php';</script>";
}
else
{
//增加密码错误后错误次数和锁定功能
//登录成功后错误次数归零，跳转到对应页面
$reset="UPDATE userforP.userforP SET Ulogtimes=0 WHERE Uname = '$name'";
$stmt = $conn->prepare($reset);
$count = $stmt->execute();//执行预处理语句
echo"<script type='text/javascript'>alert('登陆成功');location='logok.html';</script>";
}
}
else
{
echo "Query failed\n";
}
$conn = null; // 关闭连接
}
catch(PDOException $e)
{
echo $e->getMessage();
}
?>
- 注册-插入数据库
<?php
/**
* 注册信息验证
*/
session_start();
if($_SESSION["validcode"] != $_POST['codeNum'])
{
echo"<script type='text/javascript'>alert('验证码错误，登陆失败!'); location='register.php';</script>";
}
else
{
$user=$_POST['user'];
$pass=$_POST['pass'];
$confirm=$_POST['confirm'];
$dbhost = "localhost";
$charset = 'utf8';
$dbname = "userforP"; //数据库名称
$dbuser = "Admin2"; //数据库用户名
$dbpass = "123456789"; //数据库密码
$tbname = 'userforP'; //表格名
if($pass!=$confirm)
{
echo "<script>alert('两次输入密码不一致！');location='register.php';</script>";
}
else
{
try
{
$conn = new PDO("mysql:host=$dbhost;dbname=$dbname;charset=$charset", $dbuser, $dbpass);
$sql = "INSERT INTO userforP.userforP(Uname,Upassword) VALUES(?,?)";
$stmt = $conn->prepare($sql);
$stmt->bindValue(1,$user);//绑定参数
$stmt->bindValue(2,$pass);
$count = $stmt->execute();//执行预处理语句
if($count<>0)
{
echo"<script type='text/javascript'>alert('注册成功');location='logok.html';</script>";
}
else
{
echo"<script type='text/javascript'>alert('注册失败,请使用其它用户名'); location='register.php';</script>";
}
$stmt = null;//释放
$conn = null; // 关闭连接
}
catch(PDOException $e)
{
echo $e->getMessage();
}
}
}
?>
- 登录页面
sign.php
<?php
session_start();
header("Content-Type:text/html;charset=utf-8");
?>
<html>
<head>
<meta charset="utf-8">
<title>登录</title>
<link href="C.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div class="box">
<h2>登录</h2>
<form action="check.php" method="post" enctype="multipart/form-data">
<div class="inputBox">
<input type="text" name="name" value="" required="required" placeholder=
" 请输入您的学号" pattern="[0-9]{13}" title="学号为13为数字"><label>学号</label></div>
<div class="inputBox">
<input type="password" name="password" value="" required="required" placeholder=
" 请输入您的密码"><label>密码</label></div>
<input type="submit" name="submit" value="登录">
<input type="button" onclick="window.location.href='register.php'" name="submit" value="注册" >
</form>
</div>
</body>
</html>
- 注册页面
<?php
header("Content-Type:text/html;charset=utf-8");
?>
<html>
<head>
<meta charset="utf-8">
<title>注册</title>
<link href="C.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div class="box">
<h2>注册</h2>
<!--将用户输入的user,和pass提交到login.php-->
<form action="checkregister.php" method="post" enctype="multipart/form-data">
<div class="inputBox"><input type="text" name="user" value="" required="required"
placeholder= " 请输入您的学号" pattern="[0-9]{13}" title="学号为13为数字"><label>学号</label></div>
<div class="inputBox"><input type="password" name="pass" value=""required="required"
placeholder=" 请输入您的密码"><label>密码</label></div>
<div class="inputBox"><input type="password" name="confirm" value=""required="required"
placeholder=" 请重复您的密码"><label>确认密码</label></div>
<div class="inputBox"><input type="text" value="" name="codeNum" required="required"
placeholder=" 请输入验证码" pattern="[0-9]{4}" title="验证码为4个数字"><label>验证码</label></div>
<input type="submit" name="submit" value="确认注册">
<input type="button" onclick="window.location.href='sign.php'" value="返回登陆">
<img src="vericode.php" style="width:100px;height:25px;" id="code"/>
</form>
</div>
</body>
</html>
总结
完整代码请到Github上免费下载调戏：https://github.com/BackMountainDevil/Web/tree/master
CSDN因为狗币玩意不放了。
参考
- PHP中文网
- 数据库概论-王姗
- https://blog.csdn.net/Misaka_0/article/details/79313294