无法insert数据进入mysql

    	    prepare($sql);		$sth->execute(array($username,$password,$registdate));		if($sth->rowCount())		{		   echo "insert success";		}		 else {		   echo "insert error";		 }		$conn = null;	    ?>	    注册成功，请登录或继续注册    

query("set names utf8");	}catch(PDOException $e){	die("mysql connected error: ".$e->getMessage());	}?>

回复讨论(解决方案)

print_r($sth->errorInfo());

谢谢！！@xuzuning