code: public void connect() throws SQLException {
      if (!isClosed()) {
        close();
      }
  
      try {
        connect((currentHost != null) ? currentHost.host : null,
            (currentHost != null) ? currentHost.port : 3306);
      } catch (IOException ioException) {
        throw ExceptionMapper.connException(
            "Could not connect to " + currentHost + ". " + ioException.getMessage() + getTraces(),
            ioException);
      }
    }
docs: Connect to currentHost.
  
  @throws SQLException exception