RE: [PHP] limiting rows and pages like google

2 queries is ok imho, but let the database do all the work ;) The first query should be a select count (*) QUERY for a count. The second query should be the actual QUERY. Eg something cut 'n' pasted from some code of mine (not nice, but hey ;) ) ------------------------------ $db = mysql_connect($db_domain, $db_user,$db_password); mysql_select_db($db_databasename,$db); $sqlwhere = " where CuisineID = $CuisineID "; $numresults=mysql_query( "select count(*) from restaurants" . $sqlwhere); $numrows=mysql_num_rows($numresults); // get results $sqlstring= "select ID, Name,LanguageID from restaurants ". $sqlwhere . "limit $offset,$limit"; $result=@mysql_query($sqlstring,$db); //Do stuff with $result... // calculate number of pages needing links $pages=intval($numrows/$limit); // $pages now contains int of pages needed unless there is a remainder from division if ($numrows%$limit) { // has remainder so add one page $pages++; } for ($i=1;$i<=$pages;$i++) { // loop thru $newoffset=$limit*($i-1); print "<a href=\"$PHP_SELF?offset=$newoffset\">$i</a> &nbsp; \n"; } // check to see if last page if (!(($offset/$limit)==$pages) && $pages!=1) { // not last page so give NEXT link $newoffset=$offset+$limit; print "<a href=\"$PHP_SELF?offset=$newoffset\">NEXT</a><p>\n"; } -----Original Message----- From: Julian Wood [mailto:woodj@ucalgary.ca] Sent: September 14, 2001 1:34 AM To: php general list Subject: Re: [PHP] limiting rows and pages like google It's not too hard to do the next/previous through all your results, as has been shown by several people. What is a little trickier, at least when using mysql and trying to take advantage of the limit clause, is how to display how many results you have (ie 1 to 10 of 107 results). If you use the limit, you can't get the total number of rows, without doing a second search sans limit. It's also harder to do the next link, because you don't necessarily know if there are any more rows (imagine you are displaying 10 rows at a time, you are on page 3 and there are 30 total rows). Conversely, if you do a single query without the limit, then you're doing a slower search (limiting a search is way faster), and I'm not sure of the implications of the full result set residing serverside - maybe higher memory requirements. So what do people do to take advantage of limit? Two queries or a single query? Any other solutions? Any more insights on how limit works? Julian On Wednesday, September 12, 2001, at 10:16 PM, Adrian D'Costa wrote: > > Hi, > > I am trying to find out the the best way to do the following: > > I have a script that select records from a table. The problem is that I > need to limit the rows to 20. I know that I can use limit 20. But > what I > want to do is give the view a link to the next 20 till all the records > are > shown. What I don't know is how to maintain the search query and I want > to use the same script. > > The logic would be to check if the script is called the first time, then > the sql statement would be select travel.*, city.city from travel, city > where travel.cityid=city.id limit 0,20. > The second time or based on what has been selected on the page (1-20, > 21-40, etc) add that to the sql statement. My question is how? > > Can someone guide me or give me some example. > > TIA > > Adrian > > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, e-mail: php-general-unsubscribe@lists.php.net > For additional commands, e-mail: php-general-help@lists.php.net > To contact the list administrators, e-mail: php-list-admin@lists.php.net > -- Julian Wood Programmer/Analyst University of Calgary -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: php-general-unsubscribe@lists.php.net For additional commands, e-mail: php-general-help@lists.php.net To contact the list administrators, e-mail: php-list-admin@lists.php.net