在集合字段中查找元素 Spring Data JPA Query

Question

我有一个实体包含一个集合字段

@Entity
@Table(name = "SERVICE")
    public class Service {

@Id
    @GeneratedValue(strategy = GenerationType.AUTO, generator = "SEQUENCE")
    @SequenceGenerator(name = "SEQUENCE", sequenceName = "SEQUENCE")
    @Column(name = "ID_SERVICE")
    private Integer id;

        @ElementCollection
    @CollectionTable(name = "SERVICE_JOB",
            joinColumns = @JoinColumn(name = "ID_SERVICE", referencedColumnName = "ID_SERVICE"))
    @Column(name = "JOB")
    private List<String> jobs = new ArrayList<String>();
    }

我想返回现场作业包含我的变量“作业”的服务

@Query("SELECT DISTINCT s FROM Service s WHERE ?1 in (s.jobs)")
List<Service> findByJob(String job);

虽然字段作业包含我的变量，但它总是返回一个空列表

有什么建议吗？

Answer 1

尝试自定义查询，您可以像这样使用member of：

@Query("SELECT s FROM Service s WHERE ?1 member of s.jobs")
List<Service> findByJobs(String job)

Answer 2

你可以这样做

@Query("select s from Service s WHERE :job in elements(s.jobs)")
List<Service> getAllByJobs(@Param("job") String job)

要让它工作，你必须稍微改变你的实体，像这样

public class Service {
    @ElementCollection
    private List<String> jobs
}