SpringDataJPA笔记(10)-动态设置表名

在实际使用中可能会遇到需要动态设置表名的情况，特别是通常在后台管理系统里面，总有一些相似的功能需要抽象出来写一些公共的方法，以减少代码开发量，降低重复劳动

首先看BaseRepository的代码

@NoRepositoryBean
public interface BaseRepository<T, ID extends Serializable> extends JpaRepository<T, ID>, JpaSpecificationExecutor<T>, Serializable {

    @Transactional
    @Modifying(clearAutomatically = true)
    @Query("update #{#entityName} t set t.age=?2 where t.id = ?1")
    int updateAge(ID id, int age);

    @Query("select t.id from #{#entityName} t ")
    List<ID> findIds();
}

然后创建一个BaseController

@Slf4j
public class BaseController<R extends BaseRepository<T, ID>, T extends AnimalEntity, ID extends Serializable> {
    @Autowired
    private R repository;

    @ApiOperation(value = "baseAll", httpMethod = "GET")
    @GetMapping(value = "/base/all")
    public List<T> baseAll() {
        log.info("BaseController list");
        return repository.findAll();
    }

    @ApiOperation(value = "update age by id", httpMethod = "GET")
    @GetMapping(value = "/update/age/{id}")
    public T baseAll(@PathVariable ID id, @RequestParam int age) {
        log.info("BaseController list");
        repository.updateAge(id, age);
        Optional<T> optional = repository.findById(id);
        if(optional.isPresent()){
            return optional.get();
        }
        return null;
    }


    @ApiOperation(value = "base ids", httpMethod = "GET")
    @GetMapping(value = "/base/ids")
    public List<ID> findIds() {
        log.info("BaseController list");
        return repository.findIds();
    }


}

在分别创建两个不同的controller

ChapterTenCatController

@RestController
@RequestMapping("/chapter/ten/cat")
public class ChapterTenCatController extends BaseController<CatRepository, CatEntity, Long> {
}

ChapterTenDogController

@RestController
@RequestMapping("/chapter/ten/dog")
public class ChapterTenDogController extends BaseController<DogRepository, DogEntity, Long> {
}

运行代码之后，查看swagger-ui的页面

可以看到多了两个controller

打开这两个controller，看到里面的接口是在BaseController里面写的

分别运行里面的接口，可以看到是分别查询和更新了cat表和dog表的数据