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！
原文地址：https://www.cnblogs.com/gescqf/p/8167709.html
时间： 2025-01-13 16:43:52