php+mysql基础增删查改

php连接数据库有MySQLi和PDO两种方法

以下以PDO为例

一、创建数据库表(students)

二、连接数据库(db.php)

$dsn:数据库连接服务器，数据库名称
$db_user：登录数据库名称
$db_pass：登录数据库密码

 1 <?php 
 2 $dsn="mysql:dbname=phpsql;host=localhost;charset=utf8";  
 3 $db_user='root';  
 4 $db_pass='123456';  
 5 try{  
 6  $pdo=new PDO($dsn,$db_user,$db_pass);  
 7  $pdo->exec('set names utf8');
 8 }catch(PDOException $e){  
 9  echo '数据库连接失败'.$e->getMessage();  
10 } 
11 ?>

三、显示数据列表(list.php)

 1 <?php
 2     require_once 'db.php';
 3     $sql = 'select * from students';
 4     $query = $pdo->query($sql);
 5     echo "<table border='1'>";
 6     echo "<tr><td>id</td><td>number</td><td>name</td><td>操作</td><td>删除</td></tr>";
 7     foreach($query as $row){ 
 8         echo "<tr>";
 9         echo "<td>".$row['Id']."</td>";
10         echo "<td>".$row['number']."</td>";
11         echo "<td>".$row['name']."</td>";
12         echo "<td><a href='update.php?id=".$row['Id']."'>修改</a></td>";
13         echo "<td><a href='delete.php?id=".$row['Id']."'>删除</a></td>";
14         echo "</tr>";
15     }
16     echo "</table>";
17 ?>

四、添加一条数据(index.php,add.php)

 1 <html>
 2 <head>
 3     <title>添加数据</title>
 4     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 5 </head>
 6 <body>
 7     <form action="add.php" method="post">
 8         学生编号<input name="number" value="" /><br/>
 9         学生姓名<input name="name" value="" /><br/>
10         <input type="submit" value="添加" />
11     </form>
12 </body>
13 </html>

 1 <?php
 2     header('Content-Type:text/html; charset=UTF-8');
 3     require_once 'db.php';
 4     $data = $_POST;
 5     $number = $data['number'];
 6     $name = $data['name'];
 7     $sql = 'insert into students (number,name) values ("'.$number.'","'.$name.'")';
 8     $result=$pdo->exec($sql);  
 9     if($result){  
10         echo "添加成功！";  
11     } else{
12         echo "添加失败！";  
13     }
14 ?>

五、修改一条数据(update.php)

 1 <?php
 2     require_once 'db.php';
 3     header("Content-type: text/html; charset=utf-8"); 
 4 ?>
 5 <?php
 6 if($_GET){
 7     $id = $_GET['id'];
 8     $sql = 'select * from students where Id ='.$id.' limit 1';
 9     $query = $pdo->query($sql);
10     $data = $query->fetch(PDO::FETCH_OBJ) 
11 ?>
12 <html>
13 <head>
14     <title>添加数据</title>
15     <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
16 </head>
17 <body>
18 <form action="update.php" method="post">
19     <input type="hidden" name="id" value="<?php echo $data->Id; ?>" />
20     学生编号<input name="number" value="<?php echo $data->number; ?>" /><br/>
21     学生姓名<input name="name" value="<?php echo $data->name; ?>" /><br/>
22     <input type="submit" value="修改" />
23 </form>
24 </body>
25 </html>
26 <?php } ?>
27 <?php
28     if($_POST){
29         $update_data = $_POST;
30         $sql = 'update students set number = "'.$update_data['number'].'",name ="'.$update_data['name'].'" where Id = '.$update_data['id'];
31         $rst = $pdo->exec($sql);
32         echo $rst ? '修改成功！':'修改失败！';
33     }
34 ?>

六、删除一条数据(delete.php)

1 <?php
2     require_once 'db.php';
3     header('Content-Type:text/html; charset=UTF-8');
4     $id = $_GET['id'];
5     $sql = 'delete from students where Id = '.$id;
6     $result = $pdo->query($sql);
7     echo $result ? '删除成功！':'删除失败！';
8  ?>

注意：数据库，php文件，html文件，开发工具编码必须一致！

来源：https://www.cnblogs.com/yanyufei/p/8167709.html

标签

php

pdo

sql数据库

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