@MaxMinutes = 10, -- Limit on time allowed to wrap log.
@NewSize = 1 -- 你想设定的日志文件的大小(M)
Setup / initialize
DECLARE @OriginalSize int
SELECT @OriginalSize = size
FROM sysfiles
WHERE name = @LogicalFileName
SELECT 'Original Size of ' + db_name() + ' LOG is ' +
CONVERT(VARCHAR( 30),@OriginalSize) + ' 8K pages or ' +
CONVERT(VARCHAR( 30),(@OriginalSize* 8/ 1024)) + 'MB'
FROM sysfiles
WHERE name = @LogicalFileName
CREATE TABLE DummyTrans
(DummyColumn char ( 8000) not null)
DECLARE @Counter INT,
@StartTime DATETIME,
@TruncLog VARCHAR( 255)
SELECT @StartTime = GETDATE(),
@TruncLog = 'BACKUP LOG ' + db_name() + ' WITH TRUNCATE_ONLY'
DBCC SHRINKFILE (@LogicalFileName, @NewSize)
EXEC (@TruncLog)
-- Wrap the log if necessary.
WHILE @MaxMinutes > DATEDIFF (mi, @StartTime, GETDATE()) -- time has not expired
AND @OriginalSize = (SELECT size FROM sysfiles WHERE name = @LogicalFileName)
AND (@OriginalSize * 8 / 1024) > @NewSize
BEGIN -- Outer loop.
SELECT @Counter = 0
WHILE ((@Counter < @OriginalSize / 16) AND (@Counter < 50000))
BEGIN -- update
INSERT DummyTrans VALUES ('Fill Log') DELETE DummyTrans
SELECT @Counter = @Counter + 1
END
EXEC (@TruncLog)
END
SELECT 'Final Size of ' + db_name() + ' LOG is ' +
CONVERT(VARCHAR( 30),size) + ' 8K pages or ' +
CONVERT(VARCHAR( 30),(size* 8/ 1024)) + 'MB'
FROM sysfiles
WHERE name = @LogicalFileName
DROP TABLE DummyTrans
SET NOCOUNT OFF
8、更改某个表
exec sp_changeobjectowner 'tablename','dbo'9、存储更改全部表
CREATE PROCEDURE dbo.User_ChangeObjectOwnerBatch@OldOwner as NVARCHAR( 128),
@NewOwner as NVARCHAR( 128)
AS
DECLARE @Name as NVARCHAR( 128)
DECLARE @Owner as NVARCHAR( 128)
DECLARE @OwnerName as NVARCHAR( 128)
DECLARE curObject CURSOR FOR
select 'Name' = name,
'Owner' = user_name(uid)
from sysobjects
where user_name(uid)=@OldOwner
order by name
OPEN curObject
FETCH NEXT FROM curObject INTO @Name, @Owner
WHILE( @@FETCH_STATUS= 0)
BEGIN
if @Owner=@OldOwner
begin
set @OwnerName = @OldOwner + '.' + rtrim(@Name)
exec sp_changeobjectowner @OwnerName, @NewOwner
end
-- select @name,@NewOwner,@OldOwner
FETCH NEXT FROM curObject INTO @Name, @Owner
END
close curObject
deallocate curObject
GO
10、SQL SERVER中直接循环写入数据
declare @i intset @i= 1
while @i< 30
begin
insert into test (userid) values(@i)
set @i=@i+ 1
end
案例：
有如下表，要求就裱中所有?有及格的成?，在每次增?0.1的基?上，使他??好及格:
Name score
Zhangshan 80
Lishi 59
Wangwu 50
Songquan 69
while((select min(score) from tb_table)< 60)
begin
update tb_table set score =score* 1.01
where score< 60
if (select min(score) from tb_table)> 60
break
else
continue
end