问题描述
是否可以在一种存储库方法中同时使用@Query注释和规范?例如，我想要一个这样的方法:
Is it possible to use both @Query annotation and specification in one repository method? For example I'd like to have a method like this:
@Query(value="SELECT e from EMPLOYEE where firstName <> ?1")
public Page<Employee> findEmployeeBySomethigFancy(String firstName, Pageable pageable, Specification<Employee> emp);
是否可以或应该将整个查询构建为Predicate并删除@Query批注?
Is it possible or should I build the whole query as a Predicate and remove the @Query annotation?
推荐答案
首先，您应该阅读春季博客文章.
其次，根据 JpaSpecificationExecutor 接口，您的存储库应实现该接口，以下方法采用Specification自变量:
-
count(Specification<T> spec) -
List<T> findAll(Specification<T> spec) -
Page<T> findAll(Specification<T> spec, Pageable pageable) -
List<T> findAll(Specification<T> spec, Sort sort) -
T findOne(Specification<T> spec)
count(Specification<T> spec)List<T> findAll(Specification<T> spec)Page<T> findAll(Specification<T> spec, Pageable pageable)List<T> findAll(Specification<T> spec, Sort sort)T findOne(Specification<T> spec)
因此，您不能将@Query定义与Specification混合使用.
So, you can't mix a @Query definition with a Specification.
但是，由于可以使用Specification表示firstName <> ?1条件，并且由于可以组合任意数量的规范，因此只能使用Specification重写整个@Query.
However, since you can express the firstName <> ?1 condition using a Specification and because you combine as many specifications as you want, you can rewrite the whole @Query using Specification(s) only.
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