<insert id="insert" parameterType="com.xxx.xxxx.pojo.User">

        insert into t_user (name)

        values (#{user.name})

        <selectKey resultType="Integer" order="AFTER" keyProperty="user.userId">

            SELECT LAST_INSERT_ID() AS userId

        </selectKey>

</insert>

<insert id="insert" parameterType="Spares"

        useGeneratedKeys="true" keyProperty="id">

        insert into system(name) values(#{name})

</insert>