code: @Override
    public final Double getDouble(final String pColumnName) throws Exception {
      int columnIndex = this.resultSet.getColumnIndex(pColumnName);
      Double result = null;
      if (!this.resultSet.isNull(columnIndex)) {
        result = this.resultSet.getDouble(columnIndex);
      }
      return result;
    }
docs: <p>Retrieve Double column value.</p>
  @param pColumnName column name
  @return Double result
  @throws Exception - an exception