if (databaseName == null) return null;  if (query == null) return null;
  public MysqliResult mysql_db_query(Env env,                                     @NotNull String databaseName,                                     @NotNull String query,                                     @Optional Mysqli conn)  {    if (databaseName == null)      return null; // BooleanValue.FALSE;    if (query == null)      return null; // BooleanValue.FALSE;    if (conn == null)      conn = getConnection(env);    if (!conn.select_db(databaseName))      return null; // BooleanValue.FALSE;    Value value = conn.query(query, 1);    if (value instanceof MysqliResult) {      return (MysqliResult) value;    }    return null;  }