public void orderBy(Select sel, ExpContext ctx, ExpState state, boolean asc) {
sel.orderBy(_alias, asc, false);
}
public void order(Select sel, ClassMapping elem, Joins joins) {
if (elem != null) sel.orderBy(elem.getPrimaryKeyColumns(), _asc, joins, false);
else sel.orderBy(_fm.getElementMapping().getColumns(), _asc, joins, false);
}