tx() { Record a = Record(); a.set(, ); a.set(, ); a.set(, ); Record b = Record(); b.set(, ); b.set(, ); b.set(, ); Record c = Record(); c.set(, ); c.set(, ); c.set(, ); ret = Db.(() -> { result = Db.(, ); result = Db.(, ); result = Db.(, ); result; }); System..println(ret); }