jpa,querydsl

[TOC]# jpa
## 生成通用模板实现自定义方法有两种方法：1. 根据衍生规则进行实现，此种情况简单；查询方法衍生规则 http://docs.spring.io/spring-data/jpa/docs/1.10.1.RELEASE/reference/html/#repositories.query-methods.query-creation 2. 自己编写接口 OrderRepositoryExt - 在接口中添加自定义方法
- OrderRepository继承此接口
- OrderRepositoryImpl 实现此接口，这个实现类命名规则是一定的，在OrderRepository的基础上加Impl；spring基础会探测到此种情况，注入OrderRepository就可以了



### OrderRepository```public interface OrderRepository extends PagingAndSortingRepository<OrderEntity, String>, QueryDslPredicateExecutor<OrderEntity>, OrderRepositoryExt { /** * 根据渠道号和订单编号查询订单 * * @param orderNo * @param chanNo * @return */ public OrderEntity findFirstByOrderNoAndChanNo(String orderNo, String chanNo);}```### OrderRepositoryExt```public interface OrderRepositoryExt { public OrderEntity findByOrderNo(String orderNo);}```
### OrderRepositoryImpl```public class OrderRepositoryImpl implements OrderRepositoryExt { @Autowired private OrderRepository orderRepository; @Override public OrderEntity findByOrderNo(String orderNo) { QOrderEntity qOrderEntity = QOrderEntity.orderEntity; Predicate predicate = qOrderEntity.orderNo.eq(orderNo); return orderRepository.findOne(predicate); }}```### 使用方法```@RestController@RequestMapping("/test")public class OrderController { private static Logger log = LoggerFactory.getLogger(OrderController.class); @Autowired private OrderRepository repository; @RequestMapping("/orders") public Object order() { OrderEntity orderEntity = new OrderEntity(); orderEntity.setId(UUID.randomUUID().toString()); orderEntity.setAccountId("111"); orderEntity.setAmount(new BigDecimal(10)); orderEntity.setChanNo("1111"); orderEntity.setCreateAt(new Date()); orderEntity.setOrderNo(UUID.randomUUID().toString()); orderEntity.setOrderStatus("execed_success"); orderEntity.setOrderType("INVEST"); orderEntity.setProductId("2222"); orderEntity.setTransactTime(new Date()); orderEntity.setProductName("12312"); orderEntity.setUpdateAt(new Date()); repository.save(orderEntity); log.info("save-{}", JSONUtil.toJson(repository.findFirstByOrderNoAndChanNo(orderEntity.getOrderNo(), orderEntity.getChanNo()))); orderEntity.setProductName("update"); repository.save(orderEntity); log.info("update-{}", JSONUtil.toJson(repository.findByOrderNo(orderEntity.getOrderNo()))); log.info("all ={}", JSONUtil.toJson(repository.findAll())); List<String> ids = new ArrayList<>(); ids.add("11111"); return null; }```

## 手动编写hql查询实体对象idea识别不出来



来自为知笔记(Wiz)