pdo数据操作，3-4，0724

 require 'connect.php';
     $linshi =  $dbh->prepare('UPDATE `category` SET `name` = :name, `alias`=:alias WHERE `cate_id` = :cate_id ');
     if($linshi->execute(['name'=>"999",'alias'=>"8888",'cate_id'=>13])){
         if($linshi->rowCount()>0){
             echo "ok".$dbh->lastInsertId();
         }
     }

预处理对象的字段名后面跟着的“预处理变量”，要和字段名一致