Paging with SQL

satyricon

I'm wondering, I need to write a function to return how many pages of data I have.

For example, I have 100 posts (in a forum), and only want to show 20 per page.

Is it possible to get the SQL to pass in 'page 1' or 'page 2' and page 1 will grab the first 20 posts, page 2 will grab the next 20 (20-40 for example).

Any ideas?

autocolismo

<?php require_once('Connections/conn.php'); ?>
<?php
$currentPage = $HTTP_SERVER_VARS["PHP_SELF"];

$maxRows_Recordset1 = 20;
$pageNum_Recordset1 = 0;
if (isset($HTTP_GET_VARS['pageNum_Recordset1'])) {
  $pageNum_Recordset1 = $HTTP_GET_VARS['pageNum_Recordset1'];
}
$startRow_Recordset1 = $pageNum_Recordset1 * $maxRows_Recordset1;

mysql_select_db($database, $xxx);
$query_Recordset1 = "SELECT * FROM mytable";
$query_limit_Recordset1 = sprintf("%s LIMIT %d, %d", $query_Recordset1, $startRow_Recordset1, $maxRows_Recordset1);
$Recordset1 = mysql_query($query_limit_Recordset1, $noticias) or die(mysql_error());
$row_Recordset1 = mysql_fetch_assoc($Recordset1);

if (isset($HTTP_GET_VARS['totalRows_Recordset1'])) {
  $totalRows_Recordset1 = $HTTP_GET_VARS['totalRows_Recordset1'];
} else {
  $all_Recordset1 = mysql_query($query_Recordset1);
  $totalRows_Recordset1 = mysql_num_rows($all_Recordset1);
}
$totalPages_Recordset1 = ceil($totalRows_Recordset1/$maxRows_Recordset1)-1;

$queryString_Recordset1 = "";
if (!empty($HTTP_SERVER_VARS['QUERY_STRING'])) {
  $params = explode("&", $HTTP_SERVER_VARS['QUERY_STRING']);
  $newParams = array();
  foreach ($params as $param) {
    if (stristr($param, "pageNum_Recordset1") == false && 
        stristr($param, "totalRows_Recordset1") == false) {
      array_push($newParams, $param);
    }
  }
  if (count($newParams) != 0) {
    $queryString_Recordset1 = "&" . implode("&", $newParams);
  }
}
$queryString_Recordset1 = sprintf("&totalRows_Recordset1=%d%s", $totalRows_Recordset1, $queryString_Recordset1);
?>

<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>

<body>
<p>
  <?php do { 
echo $row_Recordset1['id']; 
} while ($row_Recordset1 = mysql_fetch_assoc($Recordset1)); ?>
</p>
<p>&nbsp;<a href="<?php printf("%s?pageNum_Recordset1=%d%s", $currentPage, max(0, $pageNum_Recordset1 - 1), $queryString_Recordset1); ?>">Previous</a> 
  - </p>
</body>
</html>
<?php
mysql_free_result($Recordset1);
?>

😃

satyricon

😕

realtek

Heh,

I spent weeks working on this. I have finally got it in only a few codes.

// This is the amount of records per page
$limit = 10;

// If $page has not been set then set it to 0
if (!isset ($page) {
$page = 0;
}

$results = mysql_query ("Select from blah limit ".($page $limit).",".$limit.";", $db);

$result_row = mysql_fetch_row ($results);

Now all you need to do is echo or print the table onto a page. Then insert about 5 IF statements with all
combinations of the Previous and Next buttons and just use a href like the following:

then just do -1 for the previous page etc...

I hope this helps!
Let me know if you get stuck and i'll be happy to help.

Thanks!