老师发送范围：TReceiveRange
家长发送范围：PReceiveRange
学生发送范围：SReceiveRange
alter table Notifications add TReceiveRange text alter table Notifications add PReceiveRange text alter table Notifications add SReceiveRange text
校内通知-Notifications表增加老师，家长，学生发送范围字段
原文：http://www.cnblogs.com/yechangzhong-826217795/p/5948273.html