code: protected boolean executeOneCompleteStmt(final String _complStmt)
          throws EFapsException
      {
          final boolean ret = false;
          ConnectionResource con = null;
          try {
              con = Context.getThreadContext().getConnectionResource();
              if (AbstractObjectQuery.LOG.isDebugEnabled()) {
                  AbstractObjectQuery.LOG.debug(_complStmt.toString());
              }
  
              final Statement stmt = con.createStatement();
  
              final ResultSet rs = stmt.executeQuery(_complStmt.toString());
              new ArrayList<Instance>();
              while (rs.next()) {
                  getValues().add(rs.getObject(1));
              }
              rs.close();
              stmt.close();
          } catch (final SQLException e) {
              throw new EFapsException(AttributeQuery.class, "executeOneCompleteStmt", e);
          }
          return ret;
      }
docs: Execute the actual statement against the database.
  @param _complStmt        Statment to be executed
  @return true if executed with success
  @throws EFapsException on error