function field_sql_storage_field_storage_update_field

Implements hook_field_storage_update_field().

File

core/modules/field/modules/field_sql_storage/field_sql_storage.module, line 265

Default implementation of the field storage API.

Code

function field_sql_storage_field_storage_update_field($field, $prior_field, $has_data) {
  if (!$has_data) {
    // There is no data. Re-create the tables completely.
    if (Database::getConnection()->supportsTransactionalDDL()) {
      // If the database supports transactional DDL, we can go ahead and rely
      // on it. If not, we will have to rollback manually if something fails.
      $transaction = db_transaction();
    }

    try {
      $prior_schema = _field_sql_storage_schema($prior_field);
      foreach ($prior_schema as $name => $table) {
        db_drop_table($name, $table);
      }
      $schema = _field_sql_storage_schema($field);
      foreach ($schema as $name => $table) {
        db_create_table($name, $table);
      }
    }
    catch (Exception $e) {
      if (Database::getConnection()->supportsTransactionalDDL()) {
        $transaction->rollback();
      }
      else {
        // Recreate tables.
        $prior_schema = _field_sql_storage_schema($prior_field);
        foreach ($prior_schema as $name => $table) {
          if (!db_table_exists($name)) {
            db_create_table($name, $table);
          }
        }
      }
      throw $e;
    }
  }
  else {
    // No changes can be done to fields with existing data.
  }
  backdrop_get_schema(NULL, TRUE);
}