===============
MyBatis查询总数
===============

public interface StudentDao {
    ...
    // 查询总数
    public int cnt();
    ...
}

<mapper>
    ...
    <!-- 查询总数 -->
    <select id="cnt" resultType="int">
        select count(1) from t_student
    </select>
    ...
</mapper>

public class StudentDaoTest {
    ...
    // 测试查询总数
    @Test
    public void testCnt() {
        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);

            // 查询总数
            int cnt  = dao.cnt();
            // 打印总数
            System.out.println(cnt);
        }
        catch (IOException e) {
            e.printStackTrace();
        }
    }
    ...
}

例程：HelloMyBatis