PHP学习笔记(四实训结束) 实现登录与注册连接数据库-CFANZ编程社区

文章目录

知识点

数据库连接
页面停顿跳转
获取数据

知识点

数据库连接

error_reporting(E_ALL & ~E_DEPRECATED);
  header('Content-type:text/html;charset=utf8');
  $conn = mysql_connect('localhost','root','root')
  or die("<script>alert('连接MySQL失败，请重试！');</script>");
  mysql_set_charset('utf8');//5.5以下适用
  $select = mysql_select_db('user')
  or die("<script>alert('连接数据库失败，请重试！');</script>");

页面停顿跳转

echo '<meta http-equiv="refresh" content=3;url=http://localhost:8081/login.html>';

获取数据

$query = mysql_query($sql)
  or die("<script>alert('查询失败，请重试！');</script>");
  $t = mysql_fetch_array($query,MYSQL_ASSOC);//此时$t是一个数组

login.html

<html>
  <head>
    <meta charset = "utf-8">
    <title>
      登录
    </title>
  </head>
  <div style = "height:600px;width:300px;margin:0 auto;text-align:center">
    <meta charset = "utf-8">
    <div>
    <form method = "post" action = "login.php">
      用户名:<input type = "text" name = "name" placeholder = "请输入名称"><br>
      密码:<input type = "password" name = "password" placeholder = "请输入名称"><br>
      <input type = "submit" value = "提交">
      <input type = "reset" value = "重置">
    </form>
  </div>
  </div>
</html>

login.php

<?php
  $name = $_POST['name'];
  $password = $_POST['password'];
  error_reporting(E_ALL & ~E_DEPRECATED);
  header('Content-type:text/html;charset=utf8');
  $conn = mysql_connect('localhost','root','root')
  or die("<script>alert('连接MySQL失败，请重试！');</script>");
  mysql_set_charset('utf8');//5.5以下适用
  $select = mysql_select_db('user')
  or die("<script>alert('连接数据库失败，请重试！');</script>");
  $sql = "select * from user where name = '{$name}'";
  $insert_sql = "insert into student values ('default','张三','23')";
  $update_sql = "update student set name = '李四' where id = 7";
  $delete_sql = "delete from student where id = 7";
  $query = mysql_query($sql)//此时$query是一个数组
  or die("<script>alert('查询失败，请重试！');</script>");
  $t = mysql_fetch_array($query,MYSQL_ASSOC);
  // print_r($t);
  if($t['password'] == $password){
    echo "登录成功";
  }else{
    echo "用户名或密码错误";
  }
?>

register.html

<html>
  <head>
    <meta charset = "utf-8">
    <title>
      注册
    </title>
  </head>
  <div style = "height:600px;width:300px;margin:0 auto;text-align:center">
    <meta charset = "utf-8">
    <div>
    <form method = "post" action = "register.php">
      用户名:<input type = "text" name = "name" placeholder = "请输入名称"><br>
      密码:<input type = "password" name = "password" placeholder = "请输入密码"><br>
      确认密码:<input type = "password" name = "repassword" placeholder = "请再次输入密码"><br>
      邮箱:<input type = "email" name = "email" placeholder = "请输入邮箱"><br>
      <input type = "submit" value = "提交">
      <input type = "reset" value = "重置">
    </form>
  </div>
  </div>
</html>

register.php

<?php
  $name = $_POST['name'];
  $password = $_POST['password'];
  $email = $_POST['email'];
  $repassword = $_POST['repassword'];
  error_reporting(E_ALL & ~E_DEPRECATED);
  header('Content-type:text/html;charset=utf8');
  $conn = mysql_connect('localhost','root','root')
  or die("<script>alert('连接MySQL失败，请重试！');</script>");
  mysql_set_charset('utf8');//5.5以下适用
  $select = mysql_select_db('user')
  or die("<script>alert('连接数据库失败，请重试！');</script>");
  $sql = "select * from user where name = '{$name}'";
  $insert_sql = "insert into user values('{$name}','{$password}','{$email}')";
  $update_sql = "update student set name = '李四' where id = 7";
  $delete_sql = "delete from student where id = 7";
  $query = mysql_query($sql)//此时$query是一个数组
  or die("<script>alert('查询失败，请重试！');</script>");
  // $t = mysql_fetch_array($query,MYSQL_ASSOC);
  // print_r($t);s
  if(empty($password)){
    echo "密码不能为空";  
    echo '<meta http-equiv="refresh" content=3;url=http://localhost:8081/register.html>';
  }elseif(empty($name)){
    echo "用户名不能为空";
    echo '<meta http-equiv="refresh" content=3;url=http://localhost:8081/register.html>';
  }elseif(empty($email)){
    echo "邮箱不能为空";
    echo '<meta http-equiv="refresh" content=3;url=http://localhost:8081/register.html>';
  }elseif($password != $repassword){
    echo "两次密码不一致";
    echo '<meta http-equiv="refresh" content=3;url=http://localhost:8081/register.html>';
  }else{
    echo "注册成功";
    echo '<meta http-equiv="refresh" content=3;url=http://localhost:8081/login.html>';
    mysql_query($insert_sql)
    or die("<script>alert('插入失败，请重试！');</script>");//此时$query是一个数组  
  }
?>