批量修改数据库表字段类型

实际使用例子：

/*--将所需表的某特定数值类型批量转换为其他类型--*/

/*--调用示例:E1T04_1996 char(10)-转换为nvarchar(100) --*/

set ANSI_NULLS ON

set QUOTED_IDENTIFIER ON

go

CREATE procedure [dbo].[p_set]

as

declare tb cursor for

SELECT sql='alter table ['+d.name+'] alter column ['+a.name+'] nvarchar'

+' (100)' 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='E1T04_1996' where b.name ='char' AND a.length='10'

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

--

--DECLARE @sql VARCHAR(1000)

--select @sql='alter table ['+d.name+'] alter column ['+a.name+'] nvarchar'

-- +'(100)' 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='E1T04_1996' where b.name ='char' AND a.length='10'

--

-- PRINT @sql

--------------------------------------------------------------------------------------

批量修改数据库表字段类型

2楼 zjcxc (邹建) 回复于 2004-08-11 21:13:16 得分 100 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 ---------------------------------------------------------------------------------------------- 作者tag:数据库设计 批量更改某数据库中所有表中某字段的类型 批量更改某数据库中所有表中某字段的类型 -- ======================================================= -- 批量更改某数据库中所有表中某字段的类型 -- ======================================================= IF EXISTS ( SELECT * FROM INFORMATION_SCHEMA.ROUTINES WHERE SPECIFIC_NAME = N'sp_AlterColumnType' ) DROP PROCEDURE sp_AlterColumnType GO CREATE PROCEDURE sp_AlterColumnType AS -- ============================================= -- 循环当前数据库中所有用户建的表 -- ============================================= DECLARE @TableName nvarchar(100) DECLARE @TableID nvarchar(100) DECLARE cursor_CustomTable CURSOR FOR SELECT [name],[ID] FROM sysobjects where type ='U' OPEN cursor_CustomTable FETCH NEXT FROM cursor_CustomTable INTO @TableName,@TableID WHILE @@FETCH_STATUS = 0 BEGIN -- ============================================= -- 循环当前表中所有列,取出列名和列的类型 -- ============================================= DECLARE @ColumnName nvarchar(100) DECLARE @ColumnType nvarchar(100) DECLARE cursor_Column CURSOR FOR select [name],xtype from syscolumns where [id] = @TableID and xtype=(select xtype from systypes where name='numeric') OPEN cursor_Column FETCH NEXT FROM cursor_Column INTO @ColumnName,@ColumnType WHILE @@FETCH_STATUS = 0 BEGIN --在此处修改列类型为numeric(14,2) exec('ALTER TABLE '+@TableName +' ALTER COLUMN '+@ColumnName +' numeric(14,2) null') FETCH NEXT FROM cursor_Column INTO @ColumnName,@ColumnType END CLOSE cursor_Column DEALLOCATE cursor_Column -- 循环到下一个表. FETCH NEXT FROM cursor_CustomTable INTO @TableName,@TableID END CLOSE cursor_CustomTable DEALLOCATE cursor_CustomTable GO