第九篇：Spring Boot整合Spring Data JPA

第九篇：Spring Boot整合Spring Data JPA_入门试炼04

六、PagingAndSortingRepository接口
前言：该接口提供了分页与排序的操作，该接口继承了CrudRepository
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1、持久层接口：

public interface UserRepositoryPagingAndSorting extends PagingAndSortingRepository<Users,Integer> {
}

测试代码

@RunWith(SpringRunner.class)
@SpringBootTest
public class UserRepositoryPagingAndSortingTest {@Autowiredprivate UserRepositoryPagingAndSorting userRepositoryPagingAndSorting;/*** RepositoryPagingAndSorting 接口排序*/@Testpublic void pagingAndSorting() {//order 定义排序规则Sort.Order order = new Sort.Order(Sort.Direction.DESC, "id");//sort对象封装了排序规则Sort sort = new Sort(order);List<Users> list = (List<Users>) userRepositoryPagingAndSorting.findAll(sort);
//        Iterable<Users> list = userRepositoryPagingAndSorting.findAll(sort);for (Users users : list) {System.out.println(users);}}/*** RepositoryPagingAndSorting 接口 分页*/@Testpublic void pagingAndSorting2() {
//      Pageable:封装了分页的参数，当前页，每页显示的条数，他的当前页是从0开始的
//      PageRequest(page,size): page 当前页  size 每页显示的条数//第一页 显示数量2 如果不够2条就显示应有条数
//      Pageable pageable = new PageRequest(0, 2);Pageable pageable = new PageRequest(1, 2);
//        返回值Page对象Page<Users> page = userRepositoryPagingAndSorting.findAll(pageable);System.out.println("总条数:" + page.getTotalElements());System.out.println("总页数:" + page.getTotalPages());List<Users> list = page.getContent();for (Users users : list) {System.out.println(users);}}/*** RepositoryPagingAndSorting 接口 排序+分页*/@Testpublic void pagingAndSorting3() {Sort sort = new Sort(Sort.Direction.DESC, "id");Pageable pageable = new PageRequest(0, 2, sort);Page<Users> page = userRepositoryPagingAndSorting.findAll(pageable);System.out.println("总条数:" + page.getTotalElements());System.out.println("总页数:" + page.getTotalPages());List<Users> list = page.getContent();for (Users users : list) {System.out.println(users);}}
}

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