近期项目中需要 关联 几张表再把字段转出来，在这里记录以下，我感觉网上写的都不太规范和清晰。
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
|
@Entity@SqlResultSetMapping( name="TestMapping", entities = { @EntityResult( entityClass = com.xxx.xx.data.model.TestEntity.class, fields = { @FieldResult(name="id",column="id"), @FieldResult(name="localTime",column="time"), @FieldResult(name="maximumAppointment",column="maxAppointment"), } ) })@NamedNativeQuery(name="getTestQuery", query="select tableC.id as id,tableB.time,tableC.maximumAppointment as maxAppointment from tableB " + " inner join tableA on tableA.id = tableB.tableAId " + " inner join tableC on tableB.id = tableC.tableBId " + " inner join custom on custom.id = tableA.customId " + "where " + " tableA.locationId = :locationId" + " and custom.id = :customId" + " and tableB.deleted = false ", resultSetMapping="TestMapping")@Datapublic class TestEntity { @Id private String id; private LocalTime localTime; private Integer maximumAppointment;} |
需要声明接口：
|
1
2
3
4
5
6
7
|
@Repositorypublic interface TestEntityRepository extends JpaRepository<TestEntity,String> { @Query(name="getTestQuery") List<TestEntity> getTestQuery(String locationId, String customId);} |
若不想声明接口，那可以用EntityManager 来实现。
CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder();
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://www.cnblogs.com/1994jinnan/p/13401320.html
