public Update(BrokerPool pool, User user, DocumentSet docs, String selectStmt) { super(pool, user, docs, selectStmt);
public Update(DBBroker broker, DocumentSet docs, String selectStmt) { super(broker, docs, selectStmt);
	public Update(BrokerPool pool, User user, DocumentSet docs, String selectStmt) {		super(pool, user, docs, selectStmt);	}