PC Professionell 2005 June/PCpro_2005_06.ISO/files/opensource/xamp/xampp-win32.exe/xampp/Pager_Wrapper.php

PHP Script | 2004-10-01 | 5.6 KB | 167 lines

<?php
//
// Pager_Wrapper
// -------------
//
// Ready-to-use wrappers for paging the result of a query,
// when fetching the whole resultset is NOT an option.
// This is a performance- and memory-savvy method
// to use PEAR::Pager with a database.
// With this approach, the network load can be
// consistently smaller than with PEAR::DB_Pager.
//
// Three wrappers are provided, one for each
// PEAR db abstraction layer (DB, MDB and MDB2).
//
//
// SAMPLE USAGE
// ------------
//
// $query = 'SELECT this, that FROM mytable';
// require_once 'Pager_Wrapper.php'; //this file
// $pagerOptions = array(
//     'mode'     => 'Sliding',
//     'delta'    => 2,
//     'perPage'  => 15,
// );
// $paged_data = Pager_Wrapper_MDB2($db, $query, $pagerOptions);
// //$paged_data['data'];   //paged data
// //$paged_data['links'];   //xhtml links for page navigation
// //$paged_data['page_numbers'];   //array('current', 'total');
//

/**
 * @param object PEAR::DB instance
 * @param string db query
 * @param array  PEAR::Pager options
 * @param boolean Disable pagination (get all results)
 * @return array with links and paged data
 */
function Pager_Wrapper_DB(&$db, $query, $pager_options = array(), $disabled = false)
{
   if (!array_key_exists('totalItems', $pager_options)) {
        //  be smart and try to guess the total number of records
        $queryCount = 'SELECT COUNT(*)'.stristr($query, ' FROM ');
        list($queryCount, ) = spliti('GROUP BY ', $queryCount);
        list($queryCount, ) = spliti('ORDER BY ', $queryCount);
        list($queryCount, ) = spliti('LIMIT ', $queryCount);
        $totalItems = $db->getOne($queryCount);
        if (DB::isError($totalItems)) {
            return $totalItems;
        }
        $pager_options['totalItems'] = $totalItems;
    }
    require_once 'Pager/Pager.php';
    $pager = Pager::factory($pager_options);

    $page = array();
    $page['totalItems'] = $totalItems;
    $page['links'] = $pager->links;
    $page['page_numbers'] = array(
        'current' => $pager->getCurrentPageID(),
        'total'   => $pager->numPages()
    );
    list($page['from'], $page['to']) = $pager->getOffsetByPageId();

    $res = ($disabled)
        ? $db->limitQuery($query, 0, $totalItems)
        : $db->limitQuery($query, $page['from']-1, $pager_options['perPage']);

    if (DB::isError($res)) {
        return $res;
    }
    $page['data'] = array();
    while ($res->fetchInto($row, DB_FETCHMODE_ASSOC)) {
       $page['data'][] = $row;
    }
    return $page;
}

/**
 * @param object PEAR::MDB instance
 * @param string db query
 * @param array  PEAR::Pager options
 * @param boolean Disable pagination (get all results)
 * @return array with links and paged data
 */
function Pager_Wrapper_MDB(&$db, $query, $pager_options = array(), $disabled = false)
{
    if (!array_key_exists('totalItems', $pager_options)) {
        //be smart and try to guess the total number of records
        $queryCount = 'SELECT COUNT(*)'.stristr($query, ' FROM ');
        list($queryCount, ) = spliti('GROUP BY ', $queryCount);
        list($queryCount, ) = spliti('ORDER BY ', $queryCount);
        list($queryCount, ) = spliti('LIMIT ', $queryCount);
        $totalItems = $db->queryOne($queryCount);
        if (MDB::isError($totalItems)) {
            return $totalItems;
        }
        $pager_options['totalItems'] = $totalItems;
    }
    require_once 'Pager/Pager.php';
    $pager = Pager::factory($pager_options);

    $page = array();
    $page['links'] = $pager->links;
    $page['page_numbers'] = array(
        'current' => $pager->getCurrentPageID(),
        'total'   => $pager->numPages()
    );
    list($page['from'], $page['to']) = $pager->getOffsetByPageId();

    $res = ($disabled)
        ? $db->limitQuery($query, null, 0, $totalItems)
        : $db->limitQuery($query, null, $page['from']-1, $pager_options['perPage']);

    if (MDB::isError($res)) {
        return $res;
    }
    $page['data'] = array();
    while ($row = $db->fetchInto($res, MDB_FETCHMODE_ASSOC)) {
        $page['data'][] = $row;
    }
    return $page;
}

/**
 * @param object PEAR::MDB2 instance
 * @param string db query
 * @param array  PEAR::Pager options
 * @param boolean Disable pagination (get all results)
 * @return array with links and paged data
 */
function Pager_Wrapper_MDB2(&$db, $query, $pager_options = array(), $disabled = false)
{
    if (!array_key_exists('totalItems', $pager_options)) {
        //be smart and try to guess the total number of records
        $queryCount = 'SELECT COUNT(*)'.stristr($query, ' FROM ');
        list($queryCount, ) = spliti('GROUP BY ', $queryCount);
        list($queryCount, ) = spliti('ORDER BY ', $queryCount);
        list($queryCount, ) = spliti('LIMIT ', $queryCount);
        $totalItems = $db->queryOne($queryCount);
        if (MDB2::isError($totalItems)) {
            return $totalItems;
        }
        $pager_options['totalItems'] = $totalItems;
    }
    require_once 'Pager/Pager.php';
    $pager = Pager::factory($pager_options);

    $page = array();
    $page['links'] = $pager->links;
    $page['page_numbers'] = array(
        'current' => $pager->getCurrentPageID(),
        'total'   => $pager->numPages()
    );
    list($page['from'], $page['to']) = $pager->getOffsetByPageId();
    $page['limit'] = $page['to'] - $page['from'] +1;
    if (!$disabled) {
        $db->setLimit($pager_options['perPage'], $page['from']-1);
    }
    $page['data'] = $db->queryAll($query, null, MDB2_FETCHMODE_ASSOC);
    if (MDB2::isError($page['data'])) {
        return $page['data'];
    }
    return $page;
}
?>