libraries/get_foreign.lib.php

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