php+mysql基礎增刪查改

時間 2019-11-29

原文原文鏈接

php鏈接數據庫有MySQLi和PDO兩種方法php

如下以PDO爲例html

1、建立數據庫表(students)mysql

2、鏈接數據庫(db.php)sql

$dsn:數據庫鏈接服務器，數據庫名稱
$db_user：登陸數據庫名稱
$db_pass：登陸數據庫密碼數據庫

 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 $e){  
 9  echo '數據庫鏈接失敗'.$e->getMessage();  
10 } 
11 ?>

3、顯示數據列表(list.php)服務器

 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>操做</td><td>刪除</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']."'>刪除</a></td>";
14         echo "</tr>";
15     }
16     echo "</table>";
17 ?>

4、添加一條數據(index.php,add.php)工具

 1 <html>
 2 <head>
 3     <title>添加數據</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         學生編號<input name="number" value="" /><br/>
 9         學生姓名<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 "添加失敗！";  
13     }
14 ?>

5、修改一條數據(update.php)post

 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>添加數據</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     學生編號<input name="number" value="<?php echo $data->number; ?>" /><br/>
21     學生姓名<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 ? '修改爲功！':'修改失敗！';
33     }
34 ?>

6、刪除一條數據(delete.php)開發工具

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 ? '刪除成功！':'刪除失敗！';
8  ?>

注意：數據庫，php文件，html文件，開發工具編碼必須一致！fetch

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