<?php
/* $Id: get_foreign.lib.php,v 1.9 2003/08/17 23:37:40 lem9 Exp $ */
// vim: expandtab sw=4 ts=4 sts=4:


/**
 * Gets foreign keys in preparation for a drop-down selector
 * Thanks to <markus@noga.de>
 */

// lem9
//if (!defined('PMA_GET_FOREIGN_LIB_INCLUDED')) {
//    define('PMA_GET_FOREIGN_LIB_INCLUDED', 1);

    // lem9: we always show the foreign field in the drop-down; if a display
    // field is defined, we show it besides the foreign field
    $foreign_link = false;
    if ($foreigners && isset($foreigners[$field])) {
        $foreigner       = $foreigners[$field];
        $foreign_db      = $foreigner['foreign_db'];
        $foreign_table   = $foreigner['foreign_table'];
        $foreign_field   = $foreigner['foreign_field'];

        // Count number of rows in the foreign table. Currently we do
        // not use a drop-down if more than 200 rows in the foreign table,
        // for speed reasons and because we need a better interface for this.
        //
        // We could also do the SELECT anyway, with a LIMIT, and ensure that
        // the current value of the field is one of the choices.

        $the_total   = PMA_countRecords($foreign_db, $foreign_table, TRUE);

        if ((isset($override_total) && $override_total == true) || $the_total < 200) {
            // foreign_display can be FALSE if no display field defined:

            $foreign_display = PMA_getDisplayField($foreign_db, $foreign_table);
            $dispsql         = 'SELECT ' . PMA_backquote($foreign_field)
                             . (($foreign_display == FALSE) ? '' : ', ' . PMA_backquote($foreign_display))
                             . ' FROM ' . PMA_backquote($foreign_db) . '.' . PMA_backquote($foreign_table)
                             . (($foreign_display == FALSE) ? '' :' ORDER BY ' . PMA_backquote($foreign_table) . '.' . PMA_backquote($foreign_display))
                             . (isset($foreign_limit) ? $foreign_limit : '');
            $disp            = PMA_mysql_query($dispsql);
        }
        else {
            unset($disp);
            $foreign_link = true;
        }
    } // end if $foreigners

//} // $__PMA_GET_FOREIGN_LIB_INCLUDED__
?>