Ibatis与Mysql整合不支持批量更新的问题

更新数据库时，一次性发送多条sql，性能高于一次一条sql执行~

Mysql不支持批量更新，但可以通过以下实现：

UPDATE xxxxx

<trim prefix="set" suffixOverrides=",">

<trim prefix="field_1=case" suffix="end,">

<foreach collection="list" item="i" index="index">

<if test="i.field1!=null">

when id=#{i.id} then #{i.field1}

</if>

</foreach>

</trim>

<trim prefix="field_2=case" suffix="end,">

<foreach collection="list" item="i" index="index">

<if test="i.fileld2!=null">

when id=#{i.id} then #{i.fileld2}

</if>

</foreach>

</trim>

</trim>

where id in

<foreach collection="list" open="(" separator="," close=")" item="item">

#{item.id}

</foreach>

虽然看着挺繁琐~ 但总比一条一条sql执行效率高