Subversion-Projekte lars-tiefland.php_share

<?php

// CVS: $Id: Pager_Wrapper.php,v 1.23 2006/12/12 17:25:50 quipo Exp $

//

// 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.

//

// The following wrappers are provided: one for each PEAR

// db abstraction layer (DB, MDB and MDB2), one for

// PEAR::DB_DataObject, and one for the PHP Eclipse library

//

//

// 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');

//

/**

 * Helper method - Rewrite the query into a "SELECT COUNT(*)" query.

 * @param string $sql query

 * @return string rewritten query OR false if the query can't be rewritten

 * @access private

 */

function rewriteCountQuery($sql)

{

    if (preg_match('/^\s*SELECT\s+\bDISTINCT\b/is', $sql) ||

        preg_match('/\s+GROUP\s+BY\s+/is', $sql) ||

        preg_match('/\s+UNION\s+/is', $sql)) {

        return false;

    }

    $open_parenthesis = '(?:\()';

    $close_parenthesis = '(?:\))';

    $subquery_in_select = $open_parenthesis.'.*\bFROM\b.*'.$close_parenthesis;

    $pattern = '/(?:.*'.$subquery_in_select.'.*)\bFROM\b\s+/Uims';

    if (preg_match($pattern, $sql)) {

        return false;

    }

    $subquery_with_limit_order = $open_parenthesis.'.*\b(LIMIT|ORDER)\b.*'.$close_parenthesis;

    $pattern = '/.*\bFROM\b.*(?:.*'.$subquery_with_limit_order.'.*).*/Uims';

    if (preg_match($pattern, $sql)) {

        return false;

    }

    $queryCount = preg_replace('/(?:.*)\bFROM\b\s+/Uims', 'SELECT COUNT(*) FROM ', $sql, 1);

    list($queryCount, ) = preg_split('/\s+ORDER\s+BY\s+/is', $queryCount);

    list($queryCount, ) = preg_split('/\bLIMIT\b/is', $queryCount);

    return trim($queryCount);

}

/**

 * @param object PEAR::DB instance

 * @param string db query

 * @param array  PEAR::Pager options

 * @param boolean Disable pagination (get all results)

 * @param integer fetch mode constant

 * @param mixed  parameters for query placeholders

 *        If you use placeholders for table names or column names, please

 *        count the # of items returned by the query and pass it as an option:

 *        $pager_options['totalItems'] = count_records('some query');

 * @return array with links and paged data

 */

function Pager_Wrapper_DB(&$db, $query, $pager_options = array(), $disabled = false, $fetchMode = DB_FETCHMODE_ASSOC, $dbparams = null)

{

   if (!array_key_exists('totalItems', $pager_options)) {

        //  be smart and try to guess the total number of records

        if ($countQuery = rewriteCountQuery($query)) {

            $totalItems = $db->getOne($countQuery, $dbparams);

            if (PEAR::isError($totalItems)) {

                return $totalItems;

            }

        } else {

            $res =& $db->query($query, $dbparams);

            if (PEAR::isError($res)) {

                return $res;

            }

            $totalItems = (int)$res->numRows();

            $res->free();

        }

        $pager_options['totalItems'] = $totalItems;

    }

    require_once 'Pager/Pager.php';

    $pager = Pager::factory($pager_options);

    $page = array();

    $page['totalItems'] = $pager_options['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, $dbparams)

        : $db->limitQuery($query, $page['from']-1, $pager_options['perPage'], $dbparams);

    if (PEAR::isError($res)) {

        return $res;

    }

    $page['data'] = array();

    while ($res->fetchInto($row, $fetchMode)) {

       $page['data'][] = $row;

    }

    if ($disabled) {

        $page['links'] = '';

        $page['page_numbers'] = array(

            'current' => 1,

            'total'   => 1

        );

    }

    return $page;

}

/**

 * @param object PEAR::MDB instance

 * @param string db query

 * @param array  PEAR::Pager options

 * @param boolean Disable pagination (get all results)

 * @param integer fetch mode constant

 * @return array with links and paged data

 */

function Pager_Wrapper_MDB(&$db, $query, $pager_options = array(), $disabled = false, $fetchMode = MDB_FETCHMODE_ASSOC)

{

    if (!array_key_exists('totalItems', $pager_options)) {

        //be smart and try to guess the total number of records

        if ($countQuery = rewriteCountQuery($query)) {

            $totalItems = $db->queryOne($countQuery);

            if (PEAR::isError($totalItems)) {

                return $totalItems;

            }

        } else {

            $res = $db->query($query);

            if (PEAR::isError($res)) {

                return $res;

            }

            $totalItems = (int)$db->numRows($res);

            $db->freeResult($res);

        }

        $pager_options['totalItems'] = $totalItems;

    }

    require_once 'Pager/Pager.php';

    $pager = Pager::factory($pager_options);

    $page = array();

    $page['totalItems'] = $pager_options['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, null, 0, $totalItems)

        : $db->limitQuery($query, null, $page['from']-1, $pager_options['perPage']);

    if (PEAR::isError($res)) {

        return $res;

    }

    $page['data'] = array();

    while ($row = $db->fetchInto($res, $fetchMode)) {

        $page['data'][] = $row;

    }

    if ($disabled) {

        $page['links'] = '';

        $page['page_numbers'] = array(

            'current' => 1,

            'total'   => 1

        );

    }

    return $page;

}

/**

 * @param object PEAR::MDB2 instance

 * @param string db query

 * @param array  PEAR::Pager options

 * @param boolean Disable pagination (get all results)

 * @param integer fetch mode constant

 * @return array with links and paged data

 */

function Pager_Wrapper_MDB2(&$db, $query, $pager_options = array(), $disabled = false, $fetchMode = MDB2_FETCHMODE_ASSOC)

{

    if (!array_key_exists('totalItems', $pager_options)) {

        //be smart and try to guess the total number of records

        if ($countQuery = rewriteCountQuery($query)) {

            $totalItems = $db->queryOne($countQuery);

            if (PEAR::isError($totalItems)) {

                return $totalItems;

            }

        } else {

            //GROUP BY => fetch the whole resultset and count the rows returned

            $res =& $db->queryCol($query);

            if (PEAR::isError($res)) {

                return $res;

            }

            $totalItems = count($res);

        }

        $pager_options['totalItems'] = $totalItems;

    }

    require_once 'Pager/Pager.php';

    $pager = Pager::factory($pager_options);

    $page = array();

    $page['links'] = $pager->links;

    $page['totalItems'] = $pager_options['totalItems'];

    $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, $fetchMode);

    if (PEAR::isError($page['data'])) {

        return $page['data'];

    }

    if ($disabled) {

        $page['links'] = '';

        $page['page_numbers'] = array(

            'current' => 1,

            'total'   => 1

        );

    }

    return $page;

}

/**

 * @param object PEAR::DataObject instance

 * @param array  PEAR::Pager options

 * @param boolean Disable pagination (get all results)

 * @return array with links and paged data

 * @author Massimiliano Arione <garak@studenti.it>

 */

function Pager_Wrapper_DBDO(&$db, $pager_options = array(), $disabled = false)

{

    if (!array_key_exists('totalItems', $pager_options)) {

        $totalItems = $db->count();

        $pager_options['totalItems'] = $totalItems;

    }

    require_once 'Pager/Pager.php';

    $pager = Pager::factory($pager_options);

    $page = array();

    $page['links'] = $pager->links;

    $page['totalItems'] = $pager_options['totalItems'];

    $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) {

        $db->limit($page['from'] - 1, $pager_options['perPage']);

    }

    $db->find();

    while ($db->fetch()) {

        $db->getLinks();

        $page['data'][] = $db->toArray('%s', true);

    }

    return $page;

}

/**

 * @param object PHP Eclipse instance

 * @param string db query

 * @param array  PEAR::Pager options

 * @param boolean Disable pagination (get all results)

 * @return array with links and paged data

 * @author Matte Edens <matte@arubanetworks.com>

 * @see http://sourceforge.net/projects/eclipselib/

 */

function Pager_Wrapper_Eclipse(&$db, $query, $pager_options = array(), $disabled = false)

{

    if (!$disabled) {

        require_once(ECLIPSE_ROOT . 'PagedQuery.php');

        $query =& new PagedQuery($db->query($query), $pager_options['perPage']);

        $totalrows = $query->getRowCount();

        $numpages  = $query->getPageCount();

        $whichpage = isset($_GET[$pager_options['urlVar']]) ? (int)$_GET[$pager_options['urlVar']] - 1 : 0;

        if ($whichpage >= $numpages) {

            $whichpage = $numpages - 1;

        }

        $result = $query->getPage($whichpage);

    } else {

        $result    = $db->query($query);

        $totalrows = $result->getRowCount();

        $numpages  = 1;

    }

    if (!$result->isSuccess()) {

        return PEAR::raiseError($result->getErrorMessage());

    }

    if (!array_key_exists('totalItems', $pager_options)) {

        $pager_options['totalItems'] = $totalrows;

    }

    $page = array();

    require_once(ECLIPSE_ROOT . 'QueryIterator.php');

    for ($it =& new QueryIterator($result); $it->isValid(); $it->next()) {

        $page['data'][] =& $it->getCurrent();

    }

    require_once 'Pager/Pager.php';

    $pager = Pager::factory($pager_options);

    $page['links']        = $pager->links;

    $page['totalItems']   = $pager_options['totalItems'];

    $page['page_numbers'] = array(

        'current' => $pager->getCurrentPageID(),

        'total'   => $numpages

    );

	$page['perPageSelectBox'] = $pager->getperpageselectbox();

    list($page['from'], $page['to']) = $pager->getOffsetByPageId();

    $page['limit'] = $page['to'] - $page['from'] +1;

    if ($disabled) {

        $page['links'] = '';

        $page['page_numbers'] = array(

            'current' => 1,

            'total'   => 1

        );

    }

    return $page;

}

?>