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From: Ben Bacarisse <ben.usenet@bsb.me.uk>
Newsgroups: comp.lang.php
Subject: Re: Problem With PDO? or While?
Date: Thu, 01 Feb 2018 11:11:18 +0000
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Call Me Tom <noemail@noemail.com> writes:

> I chose this forum because my sql statements appear to be working.

But I don't think you have a PHP problem.

> The logged user has all privileges on the database.
> The $numin echo prints 2555 which is the number of rows in the table.
> The table test is unchanged after running the file.
> Here's the code.
>
> <?php
>
> require_once('./includes/mysql_connect.php');
>
> $query = "SELECT report_id,fsacars_rep_url
>            FROM test";
>
> $result=$dbh->query($query);
> $numin=$result->rowCount();

rowCount is only guaranteed to tell you the number of rows affected by
queries that modify a table.  It will work like this for some databases
but it's not guaranteed.

> echo "$numin";
> while($url_orig=$result->FETCH(PDO::FETCH_NUM)) {
>         $report_id = $url_orig[0];
>         $url_trim = substr($url_orig[1],34);
>         $url_new = 'http://localhost/CAA' . $url_trim;
>         
>         $sql="UPDATE test
>                 SET fsacars_rep_url = $url_new
>                 WHERE report_id = $report_id";        
>         $dbh->exec($sql);

You are updating the table before recovering all the rows from a row
set.  The exec will invalidate the internal "cursor" that is used to
fetch the rows one by one.

> } 
>
> What am I missing?

-- 
Ben.