MySQL原生代码增删改查

$db = new PDO("mysql:host=localhost;dbname=website_1", 'root', 'root');
	$sql = "SELECT * FROM user";
	$sql = "SELECT * FROM user WHERE id=5";
	$sql = "SELECT * FROM user WHERE id>5";
	$sql = "SELECT * FROM user WHERE name='feige' or pass='xdrvrr'";
	//$sql = "SELECT * FROM user WHERE qq=3432432";
	//$sql = "SELECT * FROM user WHERE phone=13219057177";
	$sth = $db->query($sql);
	while($row = $sth->fetch(PDO::FETCH_ASSOC)){
		echo '
';
		print_r($row);
		echo '
';
		}
	if($sth){
		echo "成功查询";
	}
	$sql = "INSERT INTO user ('id','name','pass','qq','phone','create_time','update_time') VALUES('11','hyy','21332','111111','123232','12','13')";
	$res = $db->exec($sql);
	if($res){
		echo "成功添加";
	}
	$sql="UPDATE user set pass='123456' WHERE id=4";
	$sql="UPDATE user set name='feige',pass='xdrvrr' WHERE id=5";
	$sql="UPDATE user set qq='3432432',phone='13219057177' WHERE id=8";
	$hyy=$db->exec($sql);
	if($hyy){
		echo "成功更新";
	}  
	//$sql="DELETE FROM user WHERE id=8";  
	//单条删除
	$sql="DELETE FROM user WHERE id in(1,2,6,7)"; 
	//多条删除
	$hhh=$db->exec($sql);  
	if($hhh){  
	    echo "成功删除";  
	}