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Drupal example source code file (batch_example.install)

This example Drupal source code file (batch_example.install) is included in the DevDaily.com "Drupal Source Code Warehouse" project. The intent of this project is to help you "Learn Drupal by Example".

PHP - Drupal tags/keywords

array, database, from, function, if, limit, nid, node, php, result, ret, row, sql, where

The batch_example.install Drupal example source code


 * @file
 * Batch example module's install and uninstall code.

 * Example of multipart update function.
 * The only difference with pre-Drupal 6 multipart updates is the existence
 * of the $sandbox param, which provides a cleaner and safer way to store progression
 * than the previous use of $_SESSION-sored custom values.
 * This dummy 'udpate' function does nothing harmful, simply
 * loads each node...
function batch_test_update_1(&$sandbox) {
  $ret = array();

  // Use the sandbox at your convenience to store the information needed
  // to track progression between successive calls to the function.
  if (!isset($sandbox['progress'])) {
    $sandbox['progress'] = 0;
    $sandbox['curr_node'] = 0;
    $sandbox['max'] = db_result(db_query('SELECT COUNT(DISTINCT nid) FROM {node}'));

  // Process nodes by groups of 5 (arbitrary value).
  // When a group of five is processed, the batch update engine determines
  // whether it should continue processing in the same request or provide
  // progress feedback to the user and wait for the next request.
  $limit = 5;

  // Retrieve the next group of nids.
  $result = db_query_range("SELECT nid FROM {node} WHERE nid > %d ORDER BY nid ASC", $sandbox['curr_node'], 0, $limit);
  while ($row = db_fetch_array($result)) {
    // Here we actually perform our dummy 'update' on the current node.
    $ret[] = update_sql('SELECT * FROM {node} WHERE nid = ' . $row['nid']);

    // Update our progress information.
    $sandbox['curr_node'] = $row['nid'];

  // Inform the batch update engine that we are not finished,
  // and provide an estimation of the completion level we reached.
  if ($sandbox['progress'] != $sandbox['max']) {
    $ret['#finished'] = $sandbox['progress'] / $sandbox['max'];
  return $ret;

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