mybatis操作数据库

1.读取mybatis的核心配置文件(mybsatis-config.xml)

    InputStream in = Resources.getResourceAsStream("mybatis-config.xml");

2.基于上面读取的配置信息获取一个SqlSessionFactory对象

    SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();
    SqlSessionFactory factory = builder.build(in);

3.基于SqlSessionFactory对象获取一个SqlSession对象

    SqlSession session = factory.openSession();

4.通过SqlSession执行SQL语句(EmpMapper.xml),返回处理后的结果

    List<Emp> list = session.selectList("EmpMapper.findAll");

5.输出结果

    for (Emp emp : list) {
        System.out.println(emp);
    }