?

?

    <insert id="createGroup" parameterType="Group" useGeneratedKeys="true" keyProperty="id">
		insert into res_chat_group(ROOT_USER_ID, IS_USABLE, ESTABLISH_TIME, GROUP_NAME)
        values(#{owner.id}, #{isUsable}, #{establishTime}, #{groupName})
    </insert>  

?

其中keyProperty的id是前面parameterType所对应类Group中的属性