1，mybites的xml中：
<insert id="insert" useGeneratedKeys="true" keyProperty="dm_num" parameterType="com.mer.entity.DealerMostly">
insert into dealer_mostly(phone,status,name,add_date)
values(#{phone},#{status},#{name},date_format(#{add_date},"%Y-%m-%d %H:%i:%s"))
</insert>
keyproperty对应实体类中的主键字段
2，调用：AdminInfo adminInfo = new AdminInfo();
//用户名
String dm_num = dealerMostly.getDm_num().toString();
adminInfo.setAdmin_name(dm_num);
从实体类中或许相应的主键id即可