GenericRepositoryImpl.java 文件源码

@Override
public <S> S sum(Class<S> resultClass, Specification<E> spec, LockModeType lockMode, List<SingularAttribute<E, ? extends Number>> properties) {
    CriteriaBuilder builder = em.getCriteriaBuilder();
    CriteriaQuery<S> query = builder.createQuery(resultClass);
    Root<E> root = query.from(getDomainClass());
    List<Selection<?>> selectionList = Lists.newArrayList();
    for (SingularAttribute<E, ? extends Number> property : properties) {
        selectionList.add(builder.sum(root.get(property)));
    }
    return aggregate(builder, query, root, spec, selectionList, lockMode);
}