无法在 Spring Data Repository 中创建自定义查询方法 [英] Can't create custom query method in Spring Data Repository

问题描述

我想创建自定义存储库:

I wanted to create custom repository :

public interface FriendRepositoryCustom {

    Page<Friend> findFriends(FriendCriteria friendCriteria, Pageable pageable);
}

及其实现:

@Repository
@Transactional(readOnly = true)
public class FriendRepositoryCustomImpl implements FriendRepositoryCustom {

    @PersistenceContext
    EntityManager entityManager;

    @Override
    public Page<Friend> findFriends(FriendCriteria friendCriteria, Pageable pageable) {
    ...
    }

并将其添加到主存储库:

And added it to main repository :

@Repository
public interface FriendRepository extends JpaRepository<Friend, Long>, JpaSpecificationExecutor<Friend>, FriendRepositoryCustom {

}

当我启动应用程序时出现此错误:

When i start application i get this error :

原因:org.springframework.data.mapping.PropertyReferenceException:否为 Friend 类型找到属性 findFriends！在org.springframework.data.mapping.PropertyPath.(PropertyPath.java:77)在org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:329)在org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:309)在org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:272)在org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:243)在org.springframework.data.repository.query.parser.Part.(Part.java:76)在org.springframework.data.repository.query.parser.PartTree$OrPart.(PartTree.java:247)在org.springframework.data.repository.query.parser.PartTree$Predicate.buildTree(PartTree.java:398)在org.springframework.data.repository.query.parser.PartTree$Predicate.(PartTree.java:378)在org.springframework.data.repository.query.parser.PartTree.(PartTree.java:86)在org.springframework.data.jpa.repository.query.PartTreeJpaQuery.(PartTreeJpaQuery.java:70)...省略了43个常用帧

Caused by: org.springframework.data.mapping.PropertyReferenceException: No property findFriends found for type Friend! at org.springframework.data.mapping.PropertyPath.(PropertyPath.java:77) at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:329) at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:309) at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:272) at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:243) at org.springframework.data.repository.query.parser.Part.(Part.java:76) at org.springframework.data.repository.query.parser.PartTree$OrPart.(PartTree.java:247) at org.springframework.data.repository.query.parser.PartTree$Predicate.buildTree(PartTree.java:398) at org.springframework.data.repository.query.parser.PartTree$Predicate.(PartTree.java:378) at org.springframework.data.repository.query.parser.PartTree.(PartTree.java:86) at org.springframework.data.jpa.repository.query.PartTreeJpaQuery.(PartTreeJpaQuery.java:70) ... 43 common frames omitted

推荐答案

您的实现类可能命名错误.

You are probably naming your implementation class wrong.

请注意，命名期望随着 Spring Data 2.0 发生变化.

Note that the naming expectations changed with Spring Data 2.0.

对于 <2.0 必须将实现命名为带有附加 Impl 后缀的最终存储库接口.参见示例的匹配参考文档.

For < 2.0 the implementation had to be named as the final repository interface with an additional Impl suffix. See the matching reference documentation for an example.

对于 >= 2.0，必须将实现命名为带有附加 Impl 后缀的自定义接口.查看当前参考文档以获取示例.

For >= 2.0 the implementation has to be named as the custom interface with an additional Impl suffix. See the current reference documentation for an example.

注意:您不需要任何 @Repository 注释.

Note: You don't need any of the @Repository annotations.

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