mybatis 插入数据 在没有commit时 获取主键id

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   <insert id="insert" parameterType="Mail" useGeneratedKeys="true" keyProperty="id_note">
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   insert into note(sender, from_address, subject, content, send_time)
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   values(#{sender}, #{fromAddress}, #{subject}, #{content}, #{sendTime})
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   <selectKey keyProperty="id_mail" resultType="int">
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   select LAST_INSERT_ID()
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   </selectKey>
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   </insert>
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1. <!--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-->
2.  
   <select id="selectLastId" resultType="int">
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   select LAST_INSERT_ID()
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   </select>
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