mybatis 按照条件查询

@Autowired
private StudentMapper studentMapper;

@Override
public Map getStudentList(int page, int rows,long studentId) {

    // 设置分页信息
    PageHelper.startPage(page, rows);
    // 执行查询
    StudentExample example = new StudentExample();
    Criteria criteria = example.createCriteria();
    //根据学生 id 查询
    criteria.andStudentIdEqualTo(studentId);
    //执行查询
    List<Student> list = studentMapper.selectByExample(example);

    // 取分页信息
    PageInfo<TbContent> info = new PageInfo<>(list);

    Map map= new HashMap();
    map.setRows(list);
    map.setTotal(info.getTotal());

    return map;
}