code: @Override
      public String toString4Where(final Object _value)
          throws EFapsException
      {
          String ret = "";
          if (_value instanceof BigDecimal) {
              ret =  ((BigDecimal) _value).toPlainString();
          } else if (_value instanceof String) {
              ret = (String) _value;
          } else if (_value != null) {
              ret = new BigDecimal(_value.toString()).toPlainString();
          }
          return ret;
      }
docs: {@inheritDoc}