MetaDataService.java 文件源码

long countprojectsWithMetaData(T entity, SetAttribute<Project, T> attribute) {
    CriteriaBuilder cb = em.getCriteriaBuilder();
    CriteriaQuery<Long> query = cb.createQuery(Long.class);
    Root<Project> root = query.from(Project.class);
    Join<Project, T> join = root.join(attribute);
    query.where(join.in(entity));
    query.select(cb.countDistinct(root));
    return em.createQuery(query).getSingleResult();
}