急在ibatis里如何写union
日期：2014-05-17 浏览次数：20976 次
急！！在ibatis里怎么写union！
java里有个数组a[]={“一服”，“二服”，“s1”}
ibatis里的配置
------解决方案--------------------
同一个表里，用area_name in ('一服','二服','s1')就可以了
不同表才有union
------解决方案--------------------
<select id="queryOrigin" parameterType="java.lang.String" resultType="com.aiyounet.gas.service.bean.GameUser">
SELECT DISTINCT origin AS origin,id AS id
FROM game_user
WHERE plat_name=#{platName}
AND game_name=#{gameName}
<if test="areaName！=null ">
AND
area_name in
<foreach collection="array" item="areaName" open="(" separator="," close=")">
</foreach>
</if>
</select>
- SQL code
SELECT origin FROM game_user WHERE plat_name='gamedp' AND game_name='dc2' AND area_name='一服' UNION SELECT origin FROM game_user WHERE plat_name='gamedp' AND game_name='dc2' AND area_name='二服' UNION SELECT origin FROM game_user WHERE plat_name='gamedp' AND game_name='dc2' AND area_name='s1'
java里有个数组a[]={“一服”，“二服”，“s1”}
ibatis里的配置
- XML code
<select id="queryOrigin" parameterType="java.lang.String" resultType="com.aiyounet.gas.service.bean.GameUser">
<foreach collection="array" item="areaName" open="(" separator="," close=")">
SELECT DISTINCT origin AS origin,id AS id FROM game_user WHERE plat_name=#{platName} AND game_name=#{gameName} AND area_name=#{areaName}
<if test=" array.length >1 ">
UNION
</if>
</foreach>
</select>
这样写可以不？
------解决方案--------------------
同一个表里，用area_name in ('一服','二服','s1')就可以了
不同表才有union
------解决方案--------------------
<select id="queryOrigin" parameterType="java.lang.String" resultType="com.aiyounet.gas.service.bean.GameUser">
SELECT DISTINCT origin AS origin,id AS id
FROM game_user
WHERE plat_name=#{platName}
AND game_name=#{gameName}
<if test="areaName！=null ">
AND
area_name in
<foreach collection="array" item="areaName" open="(" separator="," close=")">
</foreach>
</if>
</select>
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