删除一个表字段所引用的外键,并保存下来,在数据导入后再重新加入先前删除的外键

CREATE PROCEDURE GenForeignKey

@tablename varchar(200) --将要加上外键数据库里的表名

as

declare @cur cursor

declare @fk varchar(100)

declare @execsql varchar(8000)

begin

Declare @SQL varchar(8000)

SET @SQL=''

select @SQL = @SQL

+char(13)+' alter table '+a.VT

+ ' add constraint FK_'+VT+'_'+VF+'_'+VR+'_'+VP+

' foreign key('+VF+')

references '+VR+'('+VP+')'

FROM

(

SELECT 主键列ID=b.rkey

,VP=(SELECT name FROM syscolumns WHERE colid=b.rkey AND id=b.rkeyid)

,VT=object_name(b.fkeyid)

,VR=object_name(b.rkeyid)

,外键列ID=b.fkey

,VF=(SELECT name FROM syscolumns WHERE colid=b.fkey AND id=b.fkeyid)

FROM sysobjects a

join sysforeignkeys b on a.id=b.constid

join sysobjects c on a.parent_obj=c.id

where a.xtype='f' AND c.xtype='U'

and object_name(b.fkeyid)= @tablename

) a

print @sql

set @cur = CURSOR READ_ONLY

for

select so.name

from sysforeignkeys sf

join sysobjects so on sf.constid=so.id

join sysobjects so1 on sf.fkeyid=so1.id

where so1.name=@tablename

open @cur

FETCH NEXT FROM @cur INTO @fk

while (@@FETCH_STATUS = 0)

begin

set @execsql = 'ALTER TABLE '+@tablename+' drop CONSTRAINT ' + @fk

exec(@execsql)

FETCH NEXT FROM @cur INTO @fk

end

close @cur

deallocate @cur

end

GO