【Mybatis】学习笔记02：实现简单的查

Mybatis02：简单的查

如果你没先去学 增删改 ，然后直接看这篇记录，我想会有些困难。因为该文写的很粗劣，只是简单的截图。所以没基础的建议先去看

【Mybatis】学习笔记01：连接数据库，实现增删改

https://www.cnblogs.com/mllt/p/mybatis01.html

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创建实体类

接口

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测试

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先在实体类User中重写 toString(

    @Override
    public String toString(){
        return "User{"+
                "userId='"+userId+"'"+
                ",userName='"+userName+"'"+
                "userCount='"+userCount+"'"+
                ",userPassword='"+userPassword+"'"+
                "userGrade='"+userGrade+"'"+
                ",userRegDate='"+userRegDate+"'"+
                "userBlance='"+userBlance+"'}";
    }

    @Test
    public void UsersGetAll() throws IOException {
        InputStream is = Resources.getResourceAsStream("mybatis-config.xml");
        SqlSessionFactory sqlSessionFactory  = new SqlSessionFactoryBuilder().build(is);
        SqlSession sqlSession = sqlSessionFactory.openSession(true);
        UsersMapper mapper = sqlSession.getMapper(UsersMapper.class);
        List<User> list =  mapper.selectUser();
        System.out.println(list.get(1));
        list.forEach(user -> System.out.println(user));
    }