2009/1/25 Ashley Sheridan <a...@ashleysheridan.co.uk>:
> I've run into a bit of a problem. I put together a query using mysql
> variables in the form set @m:= 0; with the select that uses it directly
> after. For any wondering, the select was using it as an incremental
> value which can't be hard coded, as the value will depend on the
> ordering of the results of the query itself.
>
> The problem seems to be that while phpMyAdmin would execute this double
> query perfectly well, php using mysql_query() was having problems, as
> apparently it can't actually run multiple queries.
>
> Now the full query looks something like this:
>
>
> mysql_query("SELECT @m:=0;");
>
> $query = "SELECT * FROM(
> SELECT profiles.id, ROUND(AVG(rated.score)) AS `rating`,
> COUNT(rated.score) AS `total`, @m:=...@m+1 AS rank FROM `rated` LEFT JOIN
> `profiles` ON (profiles.id = rated.profile_id) GROUP BY rated.profile_id
> ORDER BY rating DESC, total DESC) AS ranking WHERE ranking.id=$id";
> $result = mysql_query($query);
>
>
> which seems to be working OK so far, but does anyone know of any
> potential pitfalls I might face when doing something like this?
It's a security feature to prevent SQL injection. AFAIK you'll have no
problems so long as all calls to mysql_query happen on the same DB
connection so you might want to start using the linkid parameter.
-Stuart
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