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
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
其他回答
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
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
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
首先,你应该绝对确定你需要遍历每一行——基于行集的操作在我能想到的任何情况下都会执行得更快,通常会使用更简单的代码。
根据您的数据,可能只使用SELECT语句循环,如下所示:
Declare @Id int
While (Select Count(*) From ATable Where Processed = 0) > 0
Begin
Select Top 1 @Id = Id From ATable Where Processed = 0
--Do some processing here
Update ATable Set Processed = 1 Where Id = @Id
End
另一种方法是使用临时表:
Select *
Into #Temp
From ATable
Declare @Id int
While (Select Count(*) From #Temp) > 0
Begin
Select Top 1 @Id = Id From #Temp
--Do some processing here
Delete #Temp Where Id = @Id
End
您应该选择的选项实际上取决于数据的结构和容量。
注意:如果您正在使用SQL Server,您将更好地使用:
WHILE EXISTS(SELECT * FROM #Temp)
使用COUNT将不得不触及表中的每一行,EXISTS只需要触及第一行(参见Josef的回答)。
可以使用游标来做到这一点:
创建函数[dbo].f_teste_loop 返回@tabela表 ( 鳕鱼int, 省varchar (10) ) 作为 开始
insert into @tabela values (1, 'verde');
insert into @tabela values (2, 'amarelo');
insert into @tabela values (3, 'azul');
insert into @tabela values (4, 'branco');
return;
end
创建过程[dbo].[sp_test_loop] 作为 开始
DECLARE @cod int, @nome varchar(10);
DECLARE curLoop CURSOR STATIC LOCAL
FOR
SELECT
cod
,nome
FROM
dbo.f_teste_loop();
OPEN curLoop;
FETCH NEXT FROM curLoop
INTO @cod, @nome;
WHILE (@@FETCH_STATUS = 0)
BEGIN
PRINT @nome;
FETCH NEXT FROM curLoop
INTO @cod, @nome;
END
CLOSE curLoop;
DEALLOCATE curLoop;
end