mybatis 插入数据 在没有commit时 获取主键id

 <insert id="insert" parameterType="Mail" useGeneratedKeys="true" keyProperty="id_note">
insert into note(sender, from_address, subject, content, send_time)
values(#{sender}, #{fromAddress}, #{subject}, #{content}, #{sendTime})
<selectKey keyProperty="id_mail" resultType="int">
select LAST_INSERT_ID()
</selectKey>
</insert>

<!--这里可以获得刚插入表格的id，为后面attachment的插入提供了mailId字段-->
<select id="selectLastId" resultType="int">
select LAST_INSERT_ID()
</select>