批量修改数据库表字段类型代码,MSSQL代码库,德仔网

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【MSSQL】批量修改数据库表字段类型

作者:Dezai.CN / 发布于2011/10/26/ 922

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[p_set]') and OBJECTPROPERTY(id, N'IsProcedure') = 1) 
drop procedure [dbo].[p_set] 
GO 

/*--将所有的表中,数值类型由char,varchar改为nchar,nvarchar 

--*/ 

/*--调用示例: 
exec p_set 
--*/ 
--修改的存储过程 
create procedure p_set 
as 
declare tb cursor for 
SELECT sql='alter table ['+d.name 
+'] alter column ['+a.name+'] n' 
+b.name+'('+cast(a.length*2 as varchar)+')' 
FROM syscolumns a 
left join systypes b on a.xtype=b.xusertype 
inner join sysobjects d on a.id=d.id and d.xtype='U' and d.name<>'dtproperties' 
where 
b.name in('char','varchar') 
and 
not exists(SELECT 1 FROM sysobjects where xtype='PK' and name in ( 
SELECT name FROM sysindexes WHERE indid in( 
SELECT indid FROM sysindexkeys WHERE id = a.id AND colid=a.colid 
))) --主键不能修改 
order by d.name,a.name 

declare @sql varchar(1000) 
open tb 
fetch next from tb into @sql 
while @@fetch_status = 0 
begin 
exec(@sql) 
fetch next from tb into @sql 
end 
close tb 
deallocate tb 
go</div>

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　修改数据库表字段　

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