修改用户定义的数据类型
来源： 编辑：duliying 更新日期：2008-9-20 11:20:04 浏览：248 次
--SQLSERVER的自定义类型比较好用吧，但是，一旦引用该数据类型后，想修改数据类型，就是一大头疼的事了，本存储过程就是专门对付它的。
--sp_rebuildallview 见本BLOG中的其它页面
create procedure sp_rechangfieldtype(@typename varchar(50), @newtype varchar(50))
as
begin declare @typeid int
declare @tablename varchar(50)
declare @column varchar(50) declare @sqlstr varchar(200)
declare @defaultid int
select @typeid = xusertype
from systypes
where name = @typename and xusertype > 256
AND (is_member(‘db_owner‘) = 1 OR is_member(‘db_ddladmin‘) = 1 OR is_member(user_name(uid))=1) declare mycursor cursor for
select o.name, c.name, c.cdefault
from syscolumns c, systypes t, sysusers u, sysobjects o
where c.xusertype = @typeid
and t.xusertype = @typeid
and o.uid = u.uid
and c.id = o.id
and o.type = ‘u‘ open mycursor
fetch next from mycursor into @tablename, @column, @defaultid
while @@fetch_status = 0
begin
if @defaultid <> 0
begin
set @sqlstr = ‘alter table ‘ + @tablename + ‘ drop ‘ + object_name(@defaultid)
exec(@sqlstr) set @sqlstr = ‘alter table ‘ + @tablename + ‘ alter column ‘ + @column + ‘ ‘ + @newtype
&
create procedure sp_rechangfieldtype(@typename varchar(50), @newtype varchar(50))
as
begin declare @typeid int
declare @tablename varchar(50)
declare @column varchar(50) declare @sqlstr varchar(200)
declare @defaultid int
select @typeid = xusertype
from systypes
where name = @typename and xusertype > 256
AND (is_member(‘db_owner‘) = 1 OR is_member(‘db_ddladmin‘) = 1 OR is_member(user_name(uid))=1) declare mycursor cursor for
select o.name, c.name, c.cdefault
from syscolumns c, systypes t, sysusers u, sysobjects o
where c.xusertype = @typeid
and t.xusertype = @typeid
and o.uid = u.uid
and c.id = o.id
and o.type = ‘u‘ open mycursor
fetch next from mycursor into @tablename, @column, @defaultid
while @@fetch_status = 0
begin
if @defaultid <> 0
begin
set @sqlstr = ‘alter table ‘ + @tablename + ‘ drop ‘ + object_name(@defaultid)
exec(@sqlstr) set @sqlstr = ‘alter table ‘ + @tablename + ‘ alter column ‘ + @column + ‘ ‘ + @newtype
&
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