function batch_example_op_2

Batch operation for batch 2 : load all nodes, 5 by five.

After each group of 5 control is returned to the batch API for later continuation.

Related topics

File

batch_example/batch_example.module, line 208

Code

function batch_example_op_2($operation_details, &$context) {
    // Use the $context['sandbox'] at your convenience to store the
    // information needed to track progression between successive calls.
    if (empty($context['sandbox'])) {
        $context['sandbox'] = array();
        $context['sandbox']['progress'] = 0;
        $context['sandbox']['current_node'] = 0;
        // Save node count for the termination message.
        $context['sandbox']['max'] = db_query('SELECT COUNT(DISTINCT nid) FROM {node}')->fetchField();
    }
    // 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.
    // That way even though we're already processing at the operation level
    // the operation itself is interruptible.
    $limit = 5;
    // Retrieve the next group of nids.
    $result = db_select('node', 'n')->fields('n', array(
        'nid',
    ))
        ->orderBy('n.nid', 'ASC')
        ->where('n.nid > :nid', array(
        ':nid' => $context['sandbox']['current_node'],
    ))
        ->extend('PagerDefault')
        ->limit($limit)
        ->execute();
    foreach ($result as $row) {
        // Here we actually perform our dummy 'processing' on the current node.
        $node = node_load($row->nid, NULL, TRUE);
        // Store some results for post-processing in the 'finished' callback.
        // The contents of 'results' will be available as $results in the
        // 'finished' function (in this example, batch_example_finished()).
        $context['results'][] = $node->nid . ' : ' . check_plain($node->title) . ' ' . $operation_details;
        // Update our progress information.
        $context['sandbox']['progress']++;
        $context['sandbox']['current_node'] = $node->nid;
        $context['message'] = check_plain($node->title);
    }
    // Inform the batch engine that we are not finished,
    // and provide an estimation of the completion level we reached.
    if ($context['sandbox']['progress'] != $context['sandbox']['max']) {
        $context['finished'] = $context['sandbox']['progress'] >= $context['sandbox']['max'];
    }
    _batch_example_update_http_requests();
}