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

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