Re: Retrieving result of COUNT(*) with PHP

Where people this the way I do, count (*) could be slower

<?
$sql = "select * from TableName";
$count = pg_query($sql);
$count = pg_num_rows($count);
?>
<td ><?=$count?></td>

I thing that's enough :)

2007/3/28, Mihail Mihailov <Mihail(dot)Mihailov(at)uta(dot)fi>:
>
> Hi,
>
> actually, I don't think you need pg_fetch_all.
> I use pg_fetch_row for the purpose. What you get with the SELECT
> clause is one row.
>
> E.g. like this:
> $res = pg_fetch_row(pg_query("SELECT COUNT(*) AS result_count FROM
> etc. WHERE etc.")); //Not a very good style :-), one should check if
> the query runs
> $count = $res[0];
>
> Another way to calculate number of rows in the result is to use
> pg_num_rows function.
> $res = pg_query("SELECT COUNT(*) AS result_count FROM etc. WHERE etc.");
> $count = pg_num_rows($res);
>
> Enjoy!
>
> Mihail
>
>
>
> Quoting Lynna Landstreet <lynna(at)spidersilk(dot)net>:
>
> > Hi there,
> >
> > I'm trying to use a SELECT COUNT(*) to count how many results would be
> > retrieved from a particular query (as part of the process of paginating
> > search results).
> >
> > But I'm having trouble figuring out how to retrieve the result of the
> count
> > in PHP. The result on its own is a resource rather than a specific
> value,
> > but when I try to retrieve the result via pg_fetch_result, some kind of
> > weird math error happens and I get a huge number that bears no
> resemblance
> > to the number of results the query actually gets when it runs (1,714,608
> for
> > a query that in actuality produces three results).
> >
> > I tried using an AS clause (SELECT COUNT(*) AS result_count FROM etc.
> WHERE
> > etc.) to give the result a name, but that didn't help, and when I tried
> > using pg_fetch_all on the result to see exactly what it was retrieving,
> I
> > got this:
> >
> > Array
> > (
> > [0] => Array
> > (
> > [result_count] => 1714608
> > )
> >
> > )
> >
> > Again with the weird number. And yet, if I run the exact same query in
> the
> > SQL window of phpPgAdmin, I get the proper result count (3 in this
> > instance).
> >
> > Does anyone know what's going on here? Can I just not use SELECT
> COUNT(*)
> > with PHP at all?
> >
> > I originally had the script running the actual query and then counting
> the
> > results, and then running it again with LIMIT and OFFSET to get one
> page's
> > worth of results, but it seemed wasteful to do it that way, so I was
> trying
> > to do it more efficiently... :-/
> >
> > Thanks,
> >
> > Lynna
> >
> > --
> > Spider Silk Design - http://www.spidersilk.net
> > 509 St Clair W Box 73576, Toronto ON Canada M6C 1C0
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>
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>

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