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
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。
其他回答
这是我使用的2008 R2代码。我使用的这段代码是在所有故事的关键字段(SSNO & EMPR_NO)上构建索引
if object_ID('tempdb..#a')is not NULL drop table #a
select 'IF EXISTS (SELECT name FROM sysindexes WHERE name ='+CHAR(39)+''+'IDX_'+COLUMN_NAME+'_'+SUBSTRING(table_name,5,len(table_name)-3)+char(39)+')'
+' begin DROP INDEX [IDX_'+COLUMN_NAME+'_'+SUBSTRING(table_name,5,len(table_name)-3)+'] ON '+table_schema+'.'+table_name+' END Create index IDX_'+COLUMN_NAME+'_'+SUBSTRING(table_name,5,len(table_name)-3)+ ' on '+ table_schema+'.'+table_name+' ('+COLUMN_NAME+') ' 'Field'
,ROW_NUMBER() over (order by table_NAMe) as 'ROWNMBR'
into #a
from INFORMATION_SCHEMA.COLUMNS
where (COLUMN_NAME like '%_SSNO_%' or COLUMN_NAME like'%_EMPR_NO_')
and TABLE_SCHEMA='dbo'
declare @loopcntr int
declare @ROW int
declare @String nvarchar(1000)
set @loopcntr=(select count(*) from #a)
set @ROW=1
while (@ROW <= @loopcntr)
begin
select top 1 @String=a.Field
from #A a
where a.ROWNMBR = @ROW
execute sp_executesql @String
set @ROW = @ROW + 1
end
-- [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
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
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
SELECT @pk = @pk + 1
会更好:
SET @pk += @pk
避免使用SELECT如果你没有引用表,只是分配值。