Java 存储库中的Spring数据过滤方法
在我的Spring Boot/Data/JPA 2.1应用程序中,我有以下实体:Java 存储库中的Spring数据过滤方法,java,spring,jpa,spring-data,spring-data-jpa,Java,Spring,Jpa,Spring Data,Spring Data Jpa,在我的Spring Boot/Data/JPA 2.1应用程序中,我有以下实体: @Entity @NamedEntityGraph(name = "graph.CardCategoryLevel", attributeNodes = { @NamedAttributeNode("cardCategory"), @NamedAttributeNode("level") }) @Table(name = "card_categories_levels") public class CardCate
@Entity
@NamedEntityGraph(name = "graph.CardCategoryLevel", attributeNodes = { @NamedAttributeNode("cardCategory"), @NamedAttributeNode("level") })
@Table(name = "card_categories_levels")
public class CardCategoryLevel extends BaseEntity implements Serializable {
@Id
@SequenceGenerator(name = "card_categories_levels_id_seq", sequenceName = "card_categories_levels_id_seq", allocationSize = 1)
@GeneratedValue(strategy = GenerationType.AUTO, generator = "card_categories_levels_id_seq")
private Long id;
@OneToOne
@JoinColumn(name = "card_category_id")
private CardCategory cardCategory;
@OneToOne
@JoinColumn(name = "level_id")
private Level level;
@Column(name = "card_drop_rate")
private Float cardDropRate;
@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "cardCategoryLevel")
private List<Card> cards = new ArrayList<Card>();
....
}
基于CardCategoryLevelRepository.findAll(Pageable Pageable)
我可以通过分页和排序检索所有CardCategoryLevel
现在我不知道如何将过滤应用到这种方法中。例如,我需要能够通过
cardcontegory
或/和Level
或/和cardroprate
过滤cardcontegorylevel
。如何将过滤功能注入CardCategoryLevel Repository.findAll(Pageable Pageable)
方法,或者可能是一种新的类似方法?使用QueryDSL和实体图实现。现在我可以使用QueryDSL谓词应用过滤(另外,请投票支持这个BUG:):
@存储库
公共接口CardCategoryLevelRepository扩展了JpaRepository、QueryDSL谓词执行器、CardCategoryLevelRepositoryCustom{
@凌驾
@EntityGraph(value=“graph.CardCategoryLevel”,type=EntityGraphType.LOAD)
列表findAll(谓词);
....
}
公共接口CardCategoryLevelRepositoryCustom{
pagefindall(谓词谓词,可分页);
}
公共类CardCategoryLevel RepositoryImpl扩展了SimpleParepository实现CardCategoryLevel RepositoryCustom{
私人最终实体管理人实体管理人;
私有最终实体路径;
私有最终路径生成器;
私人最终查询码查询码查询码查询码;
/**
*修复后,必须将其移除
* https://jira.spring.io/browse/DATAJPA-684
* http://stackoverflow.com/questions/36043665/querydsl-query-specified-join-fetching-but-the-owner-of-the-fetched-associati
*
*@param entityManager
*/
@自动连线
公共卡类别VelrepositoryImpl(EntityManager EntityManager){
超级(CardCategoryLevel.class、entityManager);
this.entityManager=entityManager;
this.path=SimpleEntityPathResolver.INSTANCE.createPath(CardCategoryLevel.class);
this.builder=新的PathBuilder(path.getType(),path.getMetadata());
this.querydsl=新的querydsl(entityManager,builder);
}
/**
*修复后,必须将其移除
* https://jira.spring.io/browse/DATAJPA-684
* http://stackoverflow.com/questions/36043665/querydsl-query-specified-join-fetching-but-the-owner-of-the-fetched-associati
*/
@凌驾
公共页findAll(谓词谓词,可分页){
JPAQuery countQuery=createQuery(谓词);
JPAQuery query=(JPAQuery)querydsl.applyPagination(可分页,createQuery(谓词));
setHint(EntityGraph.EntityGraphType.LOAD.getKey(),entityManager.getEntityGraph(“graph.CardCategoryLevel”);
Long total=countQuery.count();
List content=total>pageable.getOffset()?query.List(路径):Collections.emptyList();
返回新的PageImpl(内容、可分页、总计);
}
私有JPAQuery createQuery(谓词){
返回querydsl.createQuery(路径).where(谓词);
}
}
您可以创建一个方法名称,spring数据将根据该名称创建查询(将产生巨大的方法名称),也可以向方法添加@query并提供过滤逻辑。例如,请参见@BalajiKrishnan,我将添加以下方法:findByCardCategoryAndLevelAndCardDropRate(cardCategory,level,cardDropRate)
-是否有任何方法可以基于cardDropRate
仅检索所有CardCategoryLevel
,并跳过cardCategory
和level
的过滤?或者为了做到这一点,我需要为我的CardCategoryLevelRepository
所有参数组合提供3种不同的方法?我可能错了,但您需要三种方法
@Repository
public interface CardCategoryLevelRepository extends JpaRepository<CardCategoryLevel, Long> {
@Override
@EntityGraph(value = "graph.CardCategoryLevel", type = EntityGraphType.FETCH)
Page<CardCategoryLevel> findAll(Pageable pageable);
}
@Repository
public interface CardCategoryLevelRepository extends JpaRepository<CardCategoryLevel, Long>, QueryDslPredicateExecutor<CardCategoryLevel>, CardCategoryLevelRepositoryCustom {
@Override
@EntityGraph(value = "graph.CardCategoryLevel", type = EntityGraphType.LOAD)
List<CardCategoryLevel> findAll(Predicate predicate);
....
}
public interface CardCategoryLevelRepositoryCustom {
Page<CardCategoryLevel> findAll(Predicate predicate, Pageable pageable);
}
public class CardCategoryLevelRepositoryImpl extends SimpleJpaRepository<CardCategoryLevel, Long> implements CardCategoryLevelRepositoryCustom {
private final EntityManager entityManager;
private final EntityPath<CardCategoryLevel> path;
private final PathBuilder<CardCategoryLevel> builder;
private final Querydsl querydsl;
/**
* Workaround, must be removed once fixed
* https://jira.spring.io/browse/DATAJPA-684
* http://stackoverflow.com/questions/36043665/querydsl-query-specified-join-fetching-but-the-owner-of-the-fetched-associati
*
* @param entityManager
*/
@Autowired
public CardCategoryLevelRepositoryImpl(EntityManager entityManager) {
super(CardCategoryLevel.class, entityManager);
this.entityManager = entityManager;
this.path = SimpleEntityPathResolver.INSTANCE.createPath(CardCategoryLevel.class);
this.builder = new PathBuilder<>(path.getType(), path.getMetadata());
this.querydsl = new Querydsl(entityManager, builder);
}
/**
* Workaround, must be removed once fixed
* https://jira.spring.io/browse/DATAJPA-684
* http://stackoverflow.com/questions/36043665/querydsl-query-specified-join-fetching-but-the-owner-of-the-fetched-associati
*/
@Override
public Page<CardCategoryLevel> findAll(Predicate predicate, Pageable pageable) {
JPAQuery countQuery = createQuery(predicate);
JPAQuery query = (JPAQuery) querydsl.applyPagination(pageable, createQuery(predicate));
query.setHint(EntityGraph.EntityGraphType.LOAD.getKey(), entityManager.getEntityGraph("graph.CardCategoryLevel"));
Long total = countQuery.count();
List<CardCategoryLevel> content = total > pageable.getOffset() ? query.list(path) : Collections.<CardCategoryLevel> emptyList();
return new PageImpl<>(content, pageable, total);
}
private JPAQuery createQuery(Predicate predicate) {
return querydsl.createQuery(path).where(predicate);
}
}