Club Drupal

/**

 * Implements hook_uninstall().

 */

function field_permissions_uninstall() {

  // Collect all the field data that reference "field_permissions", within

  // the field_config table.

  //

  $records = db_query("SELECT * FROM field_config WHERE data LIKE '%field_permissions%'");

  foreach ($records as $record) {

    $data = $record->data;

    $data = unserialize($data);

    unset($data['field_permissions']);

    $data = serialize($data);

    // Update the record.

    db_query("UPDATE field_config SET data = :data WHERE id = :id",

      array(':data' => $data, ':id' => $record->id));

  }

}