近期項(xiàng)目中需要 關(guān)聯(lián) 幾張表再把字段轉(zhuǎn)出來(lái)，在這里記錄以下，我感覺(jué)網(wǎng)上寫(xiě)的都不太規(guī)范和清晰。

@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;}

需要聲明接口：

@Repositorypublic interface TestEntityRepository extends JpaRepository<TestEntity,String> { @Query(name='getTestQuery') List<TestEntity> getTestQuery(String locationId, String customId);}

若不想聲明接口，那可以用EntityManager 來(lái)實(shí)現(xiàn)。

CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder();

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