为网友们分享了Mybatis相关的编程文章，网友简志勇根据主题投稿了本篇教程内容，涉及到mybatis、choose、when相关内容，已被591网友关注，下面的电子资料对本篇知识点有更加详尽的解释。
mybatis choose when的用法实现代码如下所示：
mapper.xml:
<select id="query" resultType="map" parameterType="map">
select
<choose>
<when test="cityId == '00' ">
a.city_id as CITYID,
</when>
<otherwise>
<choose>
<when test="cityId == '0001' and statsDimension==1">
a.level1_maintain_unit_id as CITYID,
</when>
<otherwise>
a.county_id as CITYID,
</otherwise>
</choose>
</otherwise>
</choose>
sum(ONUNUM) as ONUNUM,
sum(ONTNUM) as ONTNUM
from new_olt_upopt_sp_month_${tableDate} a
where 1 = 1
<if test="cityId == '0001' and statsDimension==1">
and a.city_id = '0001'
</if>
<![CDATA[and a.gather_time >= ${startDate}]]>
<![CDATA[and a.gather_time <= ${endDate}]]>
group by
<choose>
<when test="cityId == '00' ">
a.city_id
</when>
<otherwise>
<choose>
<when test="cityId == '0001' and statsDimension==1">
a.level1_maintain_unit_id
</when>
<otherwise>
a.county_id
having a.county_id in
(select city_id from tab_city
where city_id= #{cityId} or parent_id=#{cityId})
</otherwise>
</choose>
</otherwise>
</choose>
</select>
以上所述是小编给大家介绍的Mybatis choose when用法实例代码，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对码农之家网站的支持！
