PHP：pdo连接数据库，pdo增删改查

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<?php
	header("content-type:text/html;charset=utf8");
	try{
		$dsn = "mysql:host=127.0.0.1;port=3306;charset=utf8;dbname=pdo";
		$pdo = new PDO($dsn,'root','root');
		//查询
		$sql = 'select * from wenzhang';
		$res = $pdo->query($sql);
		$data=$res->fetchAll(PDO::FETCH_ASSOC);
		var_dump($data); 
		 
		//添加
		//$sql = "insert into wenzhang(id,title,zuozhe,content) values(9,'科幻','麦克','阿斯顿发送到发')";
		
		//删除
		//$sql='delete from wenzhang where id=6';
		
		//修改
		// $sql='update wenzhang set title="喜剧" where id=8';
		// if($pdo->exec($sql)){
		// 	echo 'ok';
		// }else{
		// 	echo 'no';
		// }
	} catch (PDOException $e) {
    	die ("Error!: " . $e->getMessage() . "<br/>");
	}


?>