1：DBHelper.class.php
<?php class DBHelper{ private $mysqli; private static $host='127.0.0.1'; private static $user='root'; private static $pwd='mysql'; private static $dbname='test'; //通过构造方法进行初始化操作 public function __construct(){ $this->mysqli=new mysqli(self::$host,self::$user,self::$pwd,self::$dbname) or die('数据库链接出错:'.$this->mysqli->connect_error); //设置数据库编码为utf8 $this->mysqli->query('set names utf8'); } //执行查询语句 public function execute_dml($sql){ $arr=array(); $result=$this->mysqli->query($sql) or die($this->mysqli->error); if($result){ while($row=$result->fetch_assoc()){ //将查询结果封装到一个数组中，返回给方法调用处 $arr[]=$row; } //释放查询结果资源 $result->free(); } return $arr; } //执行增加、删除、更新语句 public function execute_dql($sql){ $result=$this->mysqli->query($sql) or die($this->mysqli->error); if(!$result){ return 0;//表示操作失败 }else{ if($this->mysqli->affected_rows>0){ return 1;//操作成功 }else{ return 2;//没有受影响的行 } } } } ?>
2:使用案例index.php
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<?php
require_once('DBHelper.class.php');
$dbhelper=new DBHelper();
$sql='select id,name,age from user';
$users=$dbhelper->execute_dml($sql);
if(!empty($users)){
?>
<table style="80%;">
<tr>
<th>ID</th>
<th>Name</th>
<th>Age</th>
<th>操作</th>
</tr>
<?php
foreach($users as $user){
?>
<tr align='center'>
<td><?php echo $user['id'];?></td>
<td><?php echo $user['name'];?></td>
<td><?php echo $user['age'];?></td>
<td>
<a href="delete.php?id=<?php echo $user['id'];?>">Delete</a> |
<a href="show.php?id=<?php echo $user['id'];?>">Show</a>
</td>
</tr>
<?php }?>
</table>
<?php
}else{
echo '<h1>No result!</h1>';
}
?>
<hr/>
<a href="add.php" style="font-size:24px;font-weight:bold;">Add a new user</a>
</body>
</html>