PHP常用连接MYSQL方式

<?php
header("Content-Type:text/html;charset=utf8");
// PDO
//1:
try{
    $pdo=@new PDO('mysql:host=localhost;dbname=sakura','root','root');
}catch(PDOException $e){
    echo $e->getMessage();
}
// PDO判断SQL执行结果
$sql="delete from songs where id=9";
$res=$pdo->exec($sql);
if($res===false){
//    echo $pdo->errorCode();
    $errInfo=$pdo->errorInfo();
    print_r($errInfo);
}

// ---------------------------------------分割线------------------------------------------------
// mysqli
$mysqli=@new mysqli('localhost','root','root','sakura',3306);
if($mysqli->connect_errno){
    die('Connect Error:'.$mysqli->connect_error);
}
$sql="delete from songs where id=9";
if(!($mysqli->query($sql))){
    echo $mysqli->error;
}