code: public boolean execute(final OneSelect _onesel)
          throws EFapsException
      {
          this.hasResult = executeOneCompleteStmt(createSQLStatement(_onesel), getAllSelects());
          if (this.hasResult) {
              for (final OneSelect onesel :  getAllSelects()) {
                  if (onesel.getFromSelect() != null && !onesel.getFromSelect().equals(this)) {
                      onesel.getFromSelect().execute(onesel);
                  }
              }
          }
          return this.hasResult;
      }
docs: Execute the from select for the given instance.
  
  @param _onesel instance
  @return true if statement didi return values, else false
  @throws EFapsException on error