十二、MyBatis分页插件

<dependency>
	<groupId>com.github.pagehelper</groupId>
	<artifactId>pagehelper</artifactId>
	<version>5.2.0</version>
</dependency>

<plugins>
	<!--设置分页插件-->
	<plugin interceptor="com.github.pagehelper.PageInterceptor"></plugin>
</plugins>

PageHelper.startPage(int pageNum, int pageSize)

PageInfo{
pageNum=8, pageSize=4, size=2, startRow=29, endRow=30, total=30, pages=8,
list=Page{count=true, pageNum=8, pageSize=4, startRow=28, endRow=32, total=30,
pages=8, reasonable=false, pageSizeZero=false},
prePage=7, nextPage=0, isFirstPage=false, isLastPage=true, hasPreviousPage=true,
hasNextPage=false, navigatePages=5, navigateFirstPage4, navigateLastPage8,
navigatepageNums=[4, 5, 6, 7, 8]
}

/**
    * 使用MyBatis的分页插件实现分页功能：
    * 1.需要在查询功能之前开启分页才能声小
    * PageHelper.startPage(int pageNum, int pageSize)
    * 2.在查询功能之后获取分页相关信息
    * PageInfo<Brand> pageInfo = new PageInfo<>(brandList, 5);
    * list: 表示分页业数据
    * navigatePages：表示当前导航分页的数量
    **/
@Test
public void testMyBatis3(){
    try {
        InputStream is = Resources.getResourceAsStream("mybatis-config.xml");
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
        SqlSession sqlSession1 = sqlSessionFactory.openSession(true);
        BrandMapper brandMapper = sqlSession1.getMapper(BrandMapper.class);
        PageHelper.startPage(2, 5);
        List<Brand> brandList = brandMapper.selectByExample(null);
        PageInfo<Brand> pageInfo = new PageInfo<>(brandList, 5);
        brandList.forEach(System.out::println);
        System.out.println(pageInfo);
    } catch (IOException e) {
        e.printStackTrace();
    }
}