假设我有以下简单的表变量:
declare @databases table
(
DatabaseID int,
Name varchar(15),
Server varchar(15)
)
-- insert a bunch rows into @databases
如果我想遍历各行,声明和使用游标是我唯一的选择吗?还有别的办法吗?
假设我有以下简单的表变量:
declare @databases table
(
DatabaseID int,
Name varchar(15),
Server varchar(15)
)
-- insert a bunch rows into @databases
如果我想遍历各行,声明和使用游标是我唯一的选择吗?还有别的办法吗?
当前回答
另一种不需要改变模式或使用临时表的方法:
DECLARE @rowCount int = 0
,@currentRow int = 1
,@databaseID int
,@name varchar(15)
,@server varchar(15);
SELECT @rowCount = COUNT(*)
FROM @databases;
WHILE (@currentRow <= @rowCount)
BEGIN
SELECT TOP 1
@databaseID = rt.[DatabaseID]
,@name = rt.[Name]
,@server = rt.[Server]
FROM (
SELECT ROW_NUMBER() OVER (
ORDER BY t.[DatabaseID], t.[Name], t.[Server]
) AS [RowNumber]
,t.[DatabaseID]
,t.[Name]
,t.[Server]
FROM @databases t
) rt
WHERE rt.[RowNumber] = @currentRow;
EXEC [your_stored_procedure] @databaseID, @name, @server;
SET @currentRow = @currentRow + 1;
END
其他回答
这种方法只需要一个变量,并且不会从@databases中删除任何行。我知道这里有很多答案,但我没有看到像这样使用MIN来获取下一个ID的答案。
DECLARE @databases TABLE
(
DatabaseID int,
Name varchar(15),
Server varchar(15)
)
-- insert a bunch rows into @databases
DECLARE @CurrID INT
SELECT @CurrID = MIN(DatabaseID)
FROM @databases
WHILE @CurrID IS NOT NULL
BEGIN
-- Do stuff for @CurrID
SELECT @CurrID = MIN(DatabaseID)
FROM @databases
WHERE DatabaseID > @CurrID
END
我真的不明白为什么你需要使用可怕的光标。 但是如果你使用的是2005/2008版本的SQL Server,还有另一种选择 使用递归
declare @databases table
(
DatabaseID int,
Name varchar(15),
Server varchar(15)
)
--; Insert records into @databases...
--; Recurse through @databases
;with DBs as (
select * from @databases where DatabaseID = 1
union all
select A.* from @databases A
inner join DBs B on A.DatabaseID = B.DatabaseID + 1
)
select * from DBs
下面是我的解决方案,它使用了一个无限循环、BREAK语句和@@ROWCOUNT函数。没有游标或临时表是必要的,我只需要写一个查询,以获得下一行在@databases表:
declare @databases table
(
DatabaseID int,
[Name] varchar(15),
[Server] varchar(15)
);
-- Populate the [@databases] table with test data.
insert into @databases (DatabaseID, [Name], [Server])
select X.DatabaseID, X.[Name], X.[Server]
from (values
(1, 'Roger', 'ServerA'),
(5, 'Suzy', 'ServerB'),
(8675309, 'Jenny', 'TommyTutone')
) X (DatabaseID, [Name], [Server])
-- Create an infinite loop & ensure that a break condition is reached in the loop code.
declare @databaseId int;
while (1=1)
begin
-- Get the next database ID.
select top(1) @databaseId = DatabaseId
from @databases
where DatabaseId > isnull(@databaseId, 0);
-- If no rows were found by the preceding SQL query, you're done; exit the WHILE loop.
if (@@ROWCOUNT = 0) break;
-- Otherwise, do whatever you need to do with the current [@databases] table row here.
print 'Processing @databaseId #' + cast(@databaseId as varchar(50));
end
像这样定义临时表-
declare @databases table
(
RowID int not null identity(1,1) primary key,
DatabaseID int,
Name varchar(15),
Server varchar(15)
)
-- insert a bunch rows into @databases
然后这样做——
declare @i int
select @i = min(RowID) from @databases
declare @max int
select @max = max(RowID) from @databases
while @i <= @max begin
select DatabaseID, Name, Server from @database where RowID = @i --do some stuff
set @i = @i + 1
end
Step1:下面的select语句为每条记录创建一个具有唯一行号的临时表。
select eno,ename,eaddress,mobno int,row_number() over(order by eno desc) as rno into #tmp_sri from emp
步骤2:声明所需的变量
DECLARE @ROWNUMBER INT
DECLARE @ename varchar(100)
步骤3:从临时表中获取总行数
SELECT @ROWNUMBER = COUNT(*) FROM #tmp_sri
declare @rno int
Step4:根据在temp中创建的唯一行号循环temp表
while @rownumber>0
begin
set @rno=@rownumber
select @ename=ename from #tmp_sri where rno=@rno **// You can take columns data from here as many as you want**
set @rownumber=@rownumber-1
print @ename **// instead of printing, you can write insert, update, delete statements**
end