mybatis 插入数据获取当条数据的id

@Insert("INSERT INTO m_sales_promotion (name,start_time,end_time,type,status)  VALUES "
+"(#{name},#{startTime},#{endTime},#{type},#{status})")
@Options(useGeneratedKeys=true,keyProperty="promotionId")

int addPromotion(Promotion pn);

@Options(useGeneratedKeys=true,keyProperty="promotionId") 设置好主键后，  执行该sql就可以拿到主键 promotionId,可以到对象promotion中获取到promotionId