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表A

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id???????????? 字段名

1?????????????? ft1

2?????????????? ft2

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表B

=================

/id??????? ft1??????? ft2?? ...

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Create Trigger Tri_test On t1
After insert ,update, delete
As
Begin
?? Declare @new varchar(10),@old varchar(10),@s varchar(100)
?? Select @new=field From inserted
?? Select @old=field From deleted
?? --新增情況
?? IF Not Exists(Select 1 From syscolumns Where id=object_id(t2) and name=@new)
?? Begin
????? Set @s='Alter table t2 add '+@new+' varchar(10)'
????? exec(@s)
?? End
?? --更新情況
?? IF EXISTS(Select 1 From syscolumns Where id=object_id(t2) and name=@old)
?? Begin
????? Set @s='Alter table t2 alter column '+@new+' varchar(10)'
????? Exec(@s)
?? End
?? --刪除
?? IF EXISTS(Select 1 From syscolumns Where id=object_id(t2) and name=@old)
?? Begin
????? Set @s='Alter table t2 drop column '+@old
????? Exec(@s)
?? End
End

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