求助大神 PageHelper limit 出现两次的问题

public class MyBatisTest {
    public static SqlSessionFactory sqlSessionFactory=null;


    public static SqlSessionFactory getSqlSessionFactory(){
        if(sqlSessionFactory==null){
            String resource="mybatis-config.xml";
            Reader reader= null ;
            try {
                reader = Resources.getResourceAsReader(resource);
                sqlSessionFactory=new SqlSessionFactoryBuilder().build(reader);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return sqlSessionFactory;
    }
    public void getAllPersons(){

        SqlSession sqlSession = this.getSqlSessionFactory().openSession();

        **PersonMapper personMapper = sqlSession.getMapper(PersonMapper.class);
        Page