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<?php
/* $Id: get_foreign.lib.php,v 2.5 2004/08/09 17:15:33 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: 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 : '');
$disp = PMA_DBI_query($dispsql);
if ($disp) {
// garvin: If a resultset has been created, pre-cache it in the $disp_row array
// This helps us from not needing to use mysql_data_seek by accessing a pre-cached
// PHP array. Usually those resultsets are not that big, so a performance hit should
// not be expected.
$disp_row = array();
while ($single_disp_row = @PMA_DBI_fetch_assoc($disp)) {
$disp_row[] = $single_disp_row;
}
@PMA_DBI_free_result($disp);
}
}
else {
unset($disp_row);
$foreign_link = true;
}
} // end if $foreigners
?>
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