Mybatis进行分页的实现

1. 2.

public class test01 {

    /**
     * index:当前页的起始索引
     * pageSize:每页显示的条数
     * pageNum:当前页的页码
     * index=(pageNum-1)*pageSize
     */
    @Test
    public void tsetPage() throws IOException {
        InputStream inputStream=Resources.getResourceAsStream("mybatis-config.xml");
        SqlSessionFactoryBuilder sessionFactoryBuilder=new SqlSessionFactoryBuilder();
        SqlSessionFactory sessionFactory=sessionFactoryBuilder.build(inputStream);
        SqlSession sqlSession=sessionFactory.openSession(true);
        EmpMapper empMapper=sqlSession.getMapper(EmpMapper.class);
        Page<Object> page=PageHelper.startPage(1,3);
        List<Emp> list=empMapper.selectByExample(null);
        PageInfo<Emp> pageInfo=new PageInfo<>(list,5);
        //list.forEach(emp -> System.out.println(emp));
        System.out.println(page);
    }
}

经过Mybatis逆向工程生成的实体类需要在类中生成toString的方法，已经构造方法。