if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[FK_药品库存_药品资料]') and OBJECTPROPERTY(id, N'IsForeignKey') = 1)
ALTER TABLE [dbo].[药品库存] DROP CONSTRAINT FK_药品库存_药品资料
if exists (select * from dbo.sysobjects where id = object_id(N\'[dbo].[图书丢失_图书编号_fk]\') and OBJECTPROPERTY(id, N\'IsForeignKey\') = 1)
ALTER TABLE [dbo].[图书丢失] DROP CONSTRAINT 图书丢失_图书编号_fk