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
-- [PO_RollBackOnReject] 'FININV10532'
alter procedure PO_RollBackOnReject
@CaseID nvarchar(100)
AS
Begin
SELECT *
INTO #tmpTable
FROM PO_InvoiceItems where CaseID = @CaseID
Declare @Id int
Declare @PO_No int
Declare @Current_Balance Money
While (Select ROW_NUMBER() OVER(ORDER BY PO_LineNo DESC) From #tmpTable) > 0
Begin
Select Top 1 @Id = PO_LineNo, @Current_Balance = Current_Balance,
@PO_No = PO_No
From #Temp
update PO_Details
Set Current_Balance = Current_Balance + @Current_Balance,
Previous_App_Amount= Previous_App_Amount + @Current_Balance,
Is_Processed = 0
Where PO_LineNumber = @Id
AND PO_No = @PO_No
update PO_InvoiceItems
Set IsVisible = 0,
Is_Processed= 0
,Is_InProgress = 0 ,
Is_Active = 0
Where PO_LineNo = @Id
AND PO_No = @PO_No
End
End
其他回答
如果您别无选择,只能逐行创建FAST_FORWARD游标。它和构建while循环一样快,而且更容易长期维护。
FAST_FORWARD 指定一个启用性能优化的FORWARD_ONLY、READ_ONLY游标。如果还指定了SCROLL或FOR_UPDATE,则FAST_FORWARD不能指定。
我是这样做的:
declare @RowNum int, @CustId nchar(5), @Name1 nchar(25)
select @CustId=MAX(USERID) FROM UserIDs --start with the highest ID
Select @RowNum = Count(*) From UserIDs --get total number of records
WHILE @RowNum > 0 --loop until no more records
BEGIN
select @Name1 = username1 from UserIDs where USERID= @CustID --get other info from that row
print cast(@RowNum as char(12)) + ' ' + @CustId + ' ' + @Name1 --do whatever
select top 1 @CustId=USERID from UserIDs where USERID < @CustID order by USERID desc--get the next one
set @RowNum = @RowNum - 1 --decrease count
END
没有游标,没有临时表,没有额外的列。 USERID列必须是唯一的整数,就像大多数主键一样。
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
你可以使用while循环:
While (Select Count(*) From #TempTable) > 0
Begin
Insert Into @Databases...
Delete From #TempTable Where x = x
End
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