spring data 接口之 PagingAndSortingRepository

PagingAndSortingRepository 接口继承于 CrudRepository 接口，拥有CrudRepository 接口的所有方法， 并新增两个方法：分页和排序。 但是这两个方法不能包含筛选条件。

Iterable findAll(Sort sort); //查询所有,排序，不进行分页
;T> findAll(Pageable pageable);

一 声明继承PagingAndSortingRepository接口的接口：IStudentdPageSortRepository

package org.zgf.spring.data.dao;

import org.springframework.data.repository.PagingAndSortingRepository;
import org.zgf.spring.data.entity.StudentPO;
/**
 * 继承PagingAndSortingRepository 接口
 * @author: zonggf
 * @date: 2016年1月15日-下午12:58:20
 */
public interface IStudentdPageSortRepository extends PagingAndSortingRepository{

    /**  PagingAndSortingRepository 接口继承于 CrudRepository 接口，拥有CrudRepository 接口的所有方法
     *   特有方法有两个 分页，和 排序， 这两个方法的缺陷是不能有筛选条件
     */
    //Iterable findAll(Sort sort); //查询所有,排序，不进行分页
    //Page findAll(Pageable pageable);
}

二 测试类

[java] view plain copy

package org.zgf.spring.data.dao;

import java.util.ArrayList;
import java.util.List;

import javax.naming.directory.DirContext;

import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Sort;
import org.springframework.data.domain.Sort.Direction;
import org.springframework.data.domain.Sort.Order;
import org.zgf.spring.data.base.BaseTest;
import org.zgf.spring.data.dao.IStudentdPageSortRepository;
import org.zgf.spring.data.entity.StudentPO;

/**
 * @ClassName: Test_IStudentdPageSortRepository
 * @Description: 测试分页排序
 * @author: zonggf
 * @date: 2016年1月15日-下午1:01:46
 */
public class Test_IStudentdPageSortRepository extends BaseTest{

    @Autowired
    private IStudentdPageSortRepository studentdPageSortRepository;


    /**
     * 查询所有记录，指定排序方式,不能自定义查询条件
     * Hibernate: select studentpo0_.id as id1_0_, studentpo0_.age as age2_0_, studentpo0_.birth as birth3_0_, studentpo0_.create_time as create_t4_0_, studentpo0_.name as name5_0_, studentpo0_.sex as sex6_0_ from spj_student_2 studentpo0_ order by studentpo0_.id desc, studentpo0_.name desc
     */
    @Test
    public void test_findAll_Sort(){
        Order idOrder = new Order(Direction.DESC, "id");
        Order nameOrder = new Order(Direction.DESC,"name");

        Sort sort = new Sort(idOrder, nameOrder);
        List students = (List) this.studentdPageSortRepository.findAll(sort);
        for (StudentPO studentPO : students) {
            System.out.println(studentPO);
        }
    }


    /**
     * 此种排序方式不能指定筛选条件
     * 排序会执行两条sql 语句
     * Hibernate: select count(*) as col_0_0_ from spj_student_2 studentpo0_
     * Hibernate: select studentpo0_.id as id1_0_, studentpo0_.age as age2_0_, studentpo0_.birth as birth3_0_, studentpo0_.create_time as create_t4_0_, studentpo0_.name as name5_0_, studentpo0_.sex as sex6_0_ from spj_student_2 studentpo0_ order by studentpo0_.id desc, studentpo0_.name asc limit ?
     */
    @Test
    public void test_findAll_page(){
        int currentPage =0; //当前页从0 开始
        int pageSize = 5;

        //排序
        Order idOrder = new Order(Direction.DESC, "id");
        Order nameOrder = new Order(Direction.ASC,"name");
        Sort sort = new Sort(idOrder,nameOrder);
        PageRequest pageRequest  = new PageRequest(currentPage, pageSize, sort);

        Page page = this.studentdPageSortRepository.findAll(pageRequest);
        System.out.println("总记录数:" + page.getTotalElements());
        System.out.println("总页数:" + page.getTotalPages());
        System.out.println("当前页（request):" + page.getNumber());
        System.out.println("当前页总记录数（request):" + page.getSize());
        System.out.println("当前页记录总数：" + page.getNumberOfElements());
        List students = page.getContent();
        for (StudentPO studentPO : students) {
            System.out.println(studentPO);
        }
    }

}