rookie MySql question about paging; Is one query enough?

Posted by Camran on Stack Overflow See other posts from Stack Overflow or by Camran
Published on 2010-05-06T14:48:29Z Indexed on 2010/05/06 14:58 UTC
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I have managed to get paging to work, almost. I want to display to the user, total nr of records found, and the currently displayed records. Ex:

4000 found, displaying 0-100.

I am testing this with the nr 2 (because I don't have that many records, have like 20). So I am using LIMIT $start, $nr_results;

Do I have to make two queries in order to display the results the way I want, one query fetching all records and then make a mysql_num_rows to get all records, then the one with the LIMIT ?

I have this:

 mysql_num_rows($qry_result);
 $total_pages = ceil($num_total / $res_per_page); //$res_per_page==2 and $num_total = 2
    if ($p - 10 < 1) {
       $pagemin=1;
    }

else { $pagemin = $p - 10; } if ($p + 10 > $total_pages) { $pagemax = $total_pages; } else { $pagemax = $p + 10; }

Here is the query:

SELECT
  mt.*, 
  fordon.*, 
  boende.*, 
  elektronik.*, 
  business.*, 
  hem_inredning.*, 
  hobby.* 
FROM classified mt 
 LEFT JOIN fordon ON fordon.classified_id = mt.classified_id 
 LEFT JOIN boende ON boende.classified_id = mt.classified_id 
 LEFT JOIN elektronik ON elektronik.classified_id = mt.classified_id 
 LEFT JOIN business ON business.classified_id = mt.classified_id 
 LEFT JOIN hem_inredning ON hem_inredning.classified_id = mt.classified_id 
 LEFT JOIN hobby ON hobby.classified_id = mt.classified_id 
 ORDER BY modify_date DESC 
 LIMIT 0, 2

Thanks, if you need more input let me know.

Basically Q is, do I have to make two queries?

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