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
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
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
我同意之前的帖子，基于集的操作通常会执行得更好，但如果你确实需要遍历行，下面是我将采取的方法:
Add a new field to your table variable (Data Type Bit, default 0) Insert your data Select the Top 1 Row where fUsed = 0 (Note: fUsed is the name of the field in step 1) Perform whatever processing you need to do Update the record in your table variable by setting fUsed = 1 for the record Select the next unused record from the table and repeat the process DECLARE @databases TABLE ( DatabaseID int, Name varchar(15), Server varchar(15), fUsed BIT DEFAULT 0 ) -- insert a bunch rows into @databases DECLARE @DBID INT SELECT TOP 1 @DBID = DatabaseID from @databases where fUsed = 0 WHILE @@ROWCOUNT <> 0 and @DBID IS NOT NULL BEGIN -- Perform your processing here --Update the record to "used" UPDATE @databases SET fUsed = 1 WHERE DatabaseID = @DBID --Get the next record SELECT TOP 1 @DBID = DatabaseID from @databases where fUsed = 0 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
我将提供基于集合的解决方案。
insert @databases (DatabaseID, Name, Server)
select DatabaseID, Name, Server
From ... (Use whatever query you would have used in the loop or cursor)
这比任何循环技术都要快得多，而且更容易编写和维护。
