SqlDatabase openDatabase(String name, String version, String displayName, int estimatedSize, [DatabaseCallback creationCallback(SqlDatabase database)])

Source 

SqlDatabase openDatabase(String name, String version, String displayName, int estimatedSize, [DatabaseCallback creationCallback]) {
  if (creationCallback != null) {
    return _blink.BlinkWindow.instance.openDatabase_Callback_5_(this, name, version, displayName, estimatedSize, creationCallback);
  }
  return _blink.BlinkWindow.instance.openDatabase_Callback_4_(this, name, version, displayName, estimatedSize);
}