mybatis插入数据后如何返回新增数据的id值

<insert id = "insert" useGeneratedKeys = "true" keyProperty = "id">
    sql语句
</insert>

<insert id = "insertEmp">
    <selectKey resultType = "integer" order = "AFTER" keyProperty = "eid" >
            select last_insert_id()    //查询最后一次添加的主键,Mysql函数
    </selectKey>
    insert into dept(id,deptname) values(#{id},#{deptname})
</insert>

<insert id = "insertDept">
    <selectKey resultType = "string" order = "BEFORE" keyProperty = "id">
        select uuid() as id
    </selectKey>
    insert into dept(id,name) values(#{id},#{name})
</insert>

<insert id="xxx">
        <selectKey resultType="com.entity.Dept" order="BEFORE" keyProperty="id,name" keyColumn="cid,cname">
            select cid,cname from CateGory limit 1;
        </selectKey>
        insert into dept(id,name) values (#{id},#{name})
    </insert>
<!--    代码解释：从Category中查询出cid，cname 赋值在方法参数中，然后添加到dept表-->