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插入返回主键：
<selectKey resultType="java.lang.Long" order="AFTER" keyProperty="id">
SELECT LAST_INSERT_ID() AS id
</selectKey>
批量插入返回主键：
/**
* 批量插入
* @param optionList
* @return
*/
int addBatch(List<TbSpecificationOption> optionList);
<!-- 批量插入 -->
<insert id="addBatch" useGeneratedKeys="true" keyProperty="id">
insert into tb_specification_option (id, option_name, spec_id,
orders)
values
<foreach collection="list" item="item" separator=",">
(#{item.id},
#{item.optionName}, #{item.specId}, #{item.orders})
</foreach>
</insert>
重点：
useGeneratedKeys="true" keyProperty="id" collection="list"