===============
MyBatis更新记录
===============

public interface StudentDao {
    ...
    // 修改学生
    public int mod(Student student);
    ...
}

<mapper ...>
    ...
    <!-- 修改学生 -->
    <update id="mod" parameterType="cn.tedu.hellomybatis.pojo.Student">
        update t_student set name=#{name}, gender=#{gender}, age=#{age}
        where number=#{number}
    </update>
    ...
</mapper>

public class StudentDaoTest {
    ...
    // 测试修改学生
    @Test
    public void testMod() {
        try {
            // SQL会话
            SqlSession session = new SqlSessionFactoryBuilder()
                .build(Resources.getResourceAsStream("mybatis-config.xml"))
                .openSession();
            // 数据访问对象
            StudentDao dao = session.getMapper(StudentDao.class);

            // 修改学生
            int rows = dao.mod(new Student(0, "1001", "貂蝉", "女", 19));
            // 受影响的行数应为1
            assertEquals(1, rows);
            // 提交事务
            session.commit();
        }
        catch (IOException e) {
            e.printStackTrace();
        }
    }
    ...
}

例程：HelloMyBatis