mybatis choose when Mybatis choose when用法实例代码
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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>
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