public Object mysql_list_fields(Env env, @NotNull String databaseName, @NotNull String tableName, @Optional Mysqli conn)
public MysqliResult mysql_list_fields(Env env, String databaseName, String tableName, @Optional Mysqli conn)
  public Object mysql_list_fields(Env env,                                  @NotNull String databaseName,                                  @NotNull String tableName,                                  @Optional Mysqli conn)  {    if (databaseName == null)      return null; // BooleanValue.FALSE;    if (tableName == null)      return null; // BooleanValue.FALSE;    return mysql_db_query(env,                          databaseName,                          "SHOW COLUMNS FROM " + tableName,                          conn);  }