code: public final String getString(final String pNm) throws ExceptionWithCode {
      if (this.strs != null && this.strs.keySet().contains(pNm)) {
        return this.strs.get(pNm);
      }
      if (this.idStrs != null && this.idStrs.keySet().contains(pNm)) {
        return this.idStrs.get(pNm);
      }
      throw new ExceptionWithCode(ExceptionWithCode.WRONG_PARAMETER,
        "There is no field - " + pNm);
    }
docs: <p>Get column with String val.</p>
  @param pNm column name
  @return String column val
  @throws ExceptionWithCode if field not found