Drupal 7事務操作

<?php
function my_transaction_function() {
  // The transaction opens here.
  $transaction = db_transaction();
 
  try {
    $id = db_insert('example')
      ->fields(array(
        'field1' => 'mystring',
        'field2' => 5,
      ))
      ->execute();
 
    my_other_function($id);
 
    return $id;
  }
  catch (Exception $e) {
    $transaction->rollback();
    watchdog_exception('my_type', $e);
  }
 
  // $transaction goes out of scope here.  Unless the it was rolled back, it
  // gets automatically commited here.
}
 
function my_other_function($id) {
  // The transaction is still open here.
 
  if ($id % 2 == 0) {
    db_update('example')
      ->condition('id', $id)
      ->fields(array('field2' => 10))
      ->execute();
  }
}
?>