一个循环更新某库所有表所有非主键列的值方法（sql 2005 & mysql）

1.提取某数据库中所有用户表的所有列：

SELECT TOP 100 * FROM syscolumns c WHERE c.id IN (SELECT id FROM sysobjects WHERE xtype='u')

2.提取某数据库中所有用户表的所有主键列：

SELECT TOP 100 * FROM syscolumns c WHERE c.id IN (SELECT id FROM sysobjects WHERE xtype='u') and colorder =1

3.提取某数据库中所有用户表的所有非主键列：

SELECT TOP 100 * FROM syscolumns c WHERE c.id IN (SELECT id FROM sysobjects WHERE xtype='u') and colorder <> 1

循环更新方法如下：

set ANSI_NULLS ON

set QUOTED_IDENTIFIER ON

go

-- =============================================

-- Author: LEAMON

-- Create date: 2011-06-10

-- Description: 循环更新该数据库中所有表的所有非主键列为某一值(存储类型为int/bigint/varchar/decimail)

-- =============================================

CREATE PROCEDURE [dbo].[P_UPALLTAB_LEAMON]

AS

BEGIN

SET NOCOUNT ON;

DECLARE @SQL VARCHAR(2000),

@TABLENAME VARCHAR(20),

@TABLEID INT,

@COLUNM VARCHAR(20)

DECLARE CUR_TABLE CURSOR FOR

SELECT ID,[NAME] FROM SYSOBJECTS WHERE XTYPE='U' ORDER BY [NAME]

OPEN CUR_TABLE

FETCH NEXT FROM CUR_TABLE INTO @TABLEID,@TABLENAME

WHILE @@FETCH_STATUS=0

BEGIN

DECLARE CUR_COLUMN CURSOR FOR

SELECT [NAME] FROM SYSCOLUMNS WHERE XTYPE IN('56','167','106','127') AND COLORDER <> '1' AND ID=@TABLEID

OPEN CUR_COLUMN

FETCH NEXT FROM CUR_COLUMN INTO @COLUNM

WHILE @@FETCH_STATUS=0

BEGIN

SET @SQL='UPDATE '+@TABLENAME+' SET '+@COLUNM+' = NULL WHERE '+@COLUNM+' IN (''-999'',''-95'')'

EXEC (@SQL)

FETCH NEXT FROM CUR_COLUMN INTO @COLUNM

END

CLOSE CUR_COLUMN

DEALLOCATE CUR_COLUMN

FETCH NEXT FROM CUR_TABLE INTO @TABLEID,@TABLENAME

END

CLOSE CUR_TABLE

DEALLOCATE CUR_TABLE

PRINT '更新作业完成'

END

--执行：EXEC P_UPALLTAB_LEAMON

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

附：sql系统表syscolumns中 xtype 所有值对应的类型名称

xtype    类型

======
34 image
35 text
36 uniqueidentifier
48 tinyint
52 smallint
56 int
58 smalldatetime
59 real
60 money
61 datetime
62 float
98 sql_variant
99 ntext
104 bit
106 decimal
108 numeric
122 smallmoney
127 bigint
165 varbinary
167 varchar
173 binary
175 char
189 timestamp
231 sysname
231 nvarchar
239 nchar

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

以下为mysql方法:

-- =============================================

-- Author: LEAMON

-- Create date: 2011-06-13

-- =============================================

use test;

drop procedure if exists P_UPALLTAB_LEAMON;

CREATE PROCEDURE P_UPALLTAB_LEAMON()

BEGIN

DECLARE done INT DEFAULT 0;

DECLARE cTbl varchar(64);

DECLARE cCol varchar(64);

DECLARE cur1 CURSOR FOR

select TABLE_NAME,COLUMN_NAME from INFORMATION_SCHEMA.COLUMNS

where TABLE_SCHEMA='test' AND DATA_TYPE in ('varchar','int','BIGINT','decimal') AND ORDINAL_POSITION <> 1 order by TABLE_NAME;

DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;

set @sqlDrop='';

OPEN cur1;

FETCH cur1 INTO cTbl, cCol;/*得到表名及列名*/

WHILE done = 0 DO

set @x=0;

set @sql=concat('select 1 into @x from ',cTbl,' where ',cCol,' in (''-999'',''-95'',''-99'',''-97'') limit 1');

PREPARE stmt1 FROM @sql;

EXECUTE stmt1;

DEALLOCATE PREPARE stmt1;

if @x<>0 then

set @sqlupdate=concat('update `',cTbl,'` set `',cCol,'` = ''null'' where `' ,cCol,'` in (''-999'',''-95'',''-99'',''-97'') ;');

PREPARE stmt1 FROM @sqlupdate;

EXECUTE stmt1;

DEALLOCATE PREPARE stmt1;

end if ;

set done = 0;

FETCH cur1 INTO cTbl, cCol;

END WHILE;

CLOSE cur1;

END

--执行： CALL P_UPALLTAB_LEAMON( )

--备注：mysql更新为null 的字段，仅varchar为更新为null；其余三个数值字段会自动更新为0。