libraries/get_foreign.lib.php

   1 <?php
   2 /* vim: set expandtab sw=4 ts=4 sts=4: */
   3 /**
   4  *
   5  * @version $Id$
   6  */
   7
   8 /**
   9  *
  10  */
  11 require_once './libraries/Table.class.php';
  12
  13 /**
  14  * Gets foreign keys in preparation for a drop-down selector
  15  * Thanks to <markus@noga.de>
  16  */
  17
  18
  19 // lem9: we always show the foreign field in the drop-down; if a display
  20 // field is defined, we show it besides the foreign field
  21 $foreign_link = false;
  22 if ($foreigners && isset($foreigners[$field])) {
  23     $foreigner       = $foreigners[$field];
  24     $foreign_db      = $foreigner['foreign_db'];
  25     $foreign_table   = $foreigner['foreign_table'];
  26     $foreign_field   = $foreigner['foreign_field'];
  27
  28     // Count number of rows in the foreign table. Currently we do
  29     // not use a drop-down if more than 200 rows in the foreign table,
  30     // for speed reasons and because we need a better interface for this.
  31     //
  32     // We could also do the SELECT anyway, with a LIMIT, and ensure that
  33     // the current value of the field is one of the choices.
  34
  35     $the_total   = PMA_Table::countRecords($foreign_db, $foreign_table, TRUE);
  36
  37     if ((isset($override_total) && $override_total == true) || $the_total < $cfg['ForeignKeyMaxLimit']) {
  38         // foreign_display can be FALSE if no display field defined:
  39         $foreign_display = PMA_getDisplayField($foreign_db, $foreign_table);
  40
  41         $f_query_main = 'SELECT ' . PMA_backquote($foreign_field)
  42                         . (($foreign_display == FALSE) ? '' : ', ' . PMA_backquote($foreign_display));
  43         $f_query_from = ' FROM ' . PMA_backquote($foreign_db) . '.' . PMA_backquote($foreign_table);
  44         $f_query_filter = empty($foreign_filter) ? '' : ' WHERE ' . PMA_backquote($foreign_field)
  45                             . ' LIKE "%' . PMA_sqlAddslashes($foreign_filter, TRUE) . '%"'
  46                             . (($foreign_display == FALSE) ? '' : ' OR ' . PMA_backquote($foreign_display)
  47                                 . ' LIKE "%' . PMA_sqlAddslashes($foreign_filter, TRUE) . '%"'
  48                                 );
  49         $f_query_order = ($foreign_display == FALSE) ? '' :' ORDER BY ' . PMA_backquote($foreign_table) . '.' . PMA_backquote($foreign_display);
  50         $f_query_limit = isset($foreign_limit) ? $foreign_limit : '';
  51
  52         if (!empty($foreign_filter)) {
  53             $res = PMA_DBI_query('SELECT COUNT(*)' . $f_query_from . $f_query_filter);
  54             if ($res) {
  55                 $the_total = PMA_DBI_fetch_value($res);
  56                 @PMA_DBI_free_result($res);
  57             } else {
  58                 $the_total = 0;
  59             }
  60         }
  61
  62         $disp            = PMA_DBI_query($f_query_main . $f_query_from . $f_query_filter . $f_query_order . $f_query_limit);
  63         if ($disp && PMA_DBI_num_rows($disp) > 0) {
  64             // garvin: If a resultset has been created, pre-cache it in the $disp_row array
  65             // This helps us from not needing to use mysql_data_seek by accessing a pre-cached
  66             // PHP array. Usually those resultsets are not that big, so a performance hit should
  67             // not be expected.
  68             $disp_row = array();
  69             while ($single_disp_row = @PMA_DBI_fetch_assoc($disp)) {
  70                 $disp_row[] = $single_disp_row;
  71             }
  72             @PMA_DBI_free_result($disp);
  73         }
  74     } else {
  75         unset($disp_row);
  76         $foreign_link = true;
  77     }
  78 }  // end if $foreigners
  79
  80 ?>