Question

i use my own mvc framework.

and post action is :

function post($pid = 0 , $title = '')
{

    $pid = $this->input->clean($pid);

    $stm =$this->Post->query("UPDATE posts SET `show_count`=show_count+1 WHERE id = $pid"); 
    $stm->execute();
    $row = $this->Post->find()->where(array('id'=>$pid))->fetchOne();
    $this->layout->set('comments' ,  $this->comments($pid));
    $this->layout->set('row' , $row);
    $this->side();
    $this->layout->view('post'); 
    echo $this->layout->render($row['title']);
}

i want to when a record fetch from database plus one show_count column .

i use this query :

UPDATE posts SET show_count = show_count + 1 WHERE id = $pid

this right in localhost but in my shared host when run query instead of one pluses ,2 plus show_count column.

how can i solve this problem?

Answer 1

It’s working in your localhost but not your internet host. The host is probably doing something behind the scenes that makes it not work. Also, since you don’t have access to all the configuration stuff on the host server, you probably won’t be able to just fix it.

Simplest fix is to do it in the software layer (assuming $pid is unique).

First get the show_count.

Then:

$oldShowCount = the current show_count
$newShowCount = $oldShowCount + 1

UPDATE posts SET show_count = $newShowCount WHERE id = $pid AND show_count = $oldShowCount

At this point, if no race conditions occurred the row will update (rows update = 1). If a race condition occurred, the update will fail (rows updated = 0).

Then check the # rows updated to verify it worked and repeat until it does.