jpa - JPA CriteriaQuery：getCount + 条件

Question

我尝试获取未分析的文章（Article.class）的所有计数（已分析== false）。可悲的是，以下代码返回绝对错误的数字。有人会知道为什么吗？

CriteriaBuilder cb = entityManager.getCriteriaBuilder();
CriteriaQuery<Long> query = cb.createQuery(Long.class);
query.select(cb.count(query.from(Article.class)));
Root<Article> articles = query.from(Article.class);
Predicate condition = cb.isFalse(articles.get(Article_.analyzed));
query.where(condition);
TypedQuery<Long> unanalyzedArticlesAmount = entityManager.createQuery(query);
return unanalyzedArticlesAmount.getSingleResult();

Answer 1

最后阅读这篇文章： 如何在通用 JPA DAO 中计算 JPA 2 CriteriaQuery 的行数？

并找到以下解决方案：

CriteriaBuilder cb = entityManager.getCriteriaBuilder();
CriteriaQuery query = cb.createQuery();    
Root<Article> root = query.from(Article.class);
query.select(cb.count(root));
Predicate condition = cb.isFalse(root.get(Article_.analyzed));
query.where(condition);
TypedQuery<Long> unanalyzedArticlesAmount = entityManager.createQuery(query);
return unanalyzedArticlesAmount.getSingleResult();