Question

我已经声明了一个临时表来保存所有必需的值，如下所示：

    DECLARE @temp TABLE
    (
    Password int,
    IdTran int,
    Kind varchar(16)
    )

INSERT INTO @temp
SELECT  s.Password, s.IdTran, 'test'
from signal s inner join vefify v 
    on s.Password = v.Password 
and s.IdTran = v.IdTran 
and v.type = 'DEV' 
where s.[Type] = 'start' 
AND NOT EXISTS (SELECT * FROM signal s2
            WHERE s.Password = s2.Password 
            and s.IdTran = s2.IdTran 
            and s2.[Type] = 'progress' )

INSERT INTO @temp
SELECT  s.Password, s.IdTran, 'test'
from signal s inner join vefify v 
    on s.Password = v.Password 
and s.IdTran = v.IdTran 
and v.type = 'PROD' 
where s.[Type] = 'progress' 
AND NOT EXISTS (SELECT * FROM signal s2
            WHERE s.Password = s2.Password 
            and s.IdTran = s2.IdTran 
            and s2.[Type] = 'finish' )

现在我需要遍历@temp表中的行，并且对于每一行调用一个sp，它将@temp表的所有参数作为输入。我怎样才能做到这一点？

Answer 1

你可以使用光标：

DECLARE @id int
DECLARE @pass varchar(100)

DECLARE cur CURSOR FOR SELECT Id, Password FROM @temp
OPEN cur

FETCH NEXT FROM cur INTO @id, @pass

WHILE @@FETCH_STATUS = 0 BEGIN
    EXEC mysp @id, @pass ... -- call your sp here
    FETCH NEXT FROM cur INTO @id, @pass
END

CLOSE cur    
DEALLOCATE cur

Answer 2

尝试将数据集从存储过程返回到C＃或VB.Net中的数据表。然后，可以使用批量复制将数据表中的大量数据复制到目标表中。我已经使用BulkCopy将包含数千行的大型数据表加载到Sql表中，并在性能方面取得了巨大成功。

您可能希望在C＃或VB.Net代码中试用BulkCopy。

Answer 3

这样的事情？

DECLARE maxval, val, @ind INT;
SELECT MAX(ID) as maxval FROM table;

while (ind <= maxval  ) DO           

      select `value` as val from `table` where `ID`=ind;

      CALL fn(val);

      SET ind = ind+1;
end while;

Answer 4

您可以这样做

    Declare @min int=0, @max int =0 --Initialize variable here which will be use in loop 
    Declare @Recordid int,@TO nvarchar(30),@Subject nvarchar(250),@Body nvarchar(max)  --Initialize variable here which are useful for your

    select ROW_NUMBER() OVER(ORDER BY [Recordid] )  AS Rownumber, Recordid, [To], [Subject], [Body], [Flag]
            into #temp_Mail_Mstr FROM Mail_Mstr where Flag='1'  --select your condition with row number & get into a temp table

    set @min = (select MIN(RecordID) from #temp_Mail_Mstr); --Get minimum row number from temp table
    set @max = (select Max(RecordID) from #temp_Mail_Mstr);  --Get maximum row number from temp table

   while(@min <= @max)
   BEGIN
        select @Recordid=Recordid, @To=[To], @Subject=[Subject], @Body=Body from #temp_Mail_Mstr where Rownumber=@min

        -- You can use your variables (like @Recordid,@To,@Subject,@Body) here  
        -- Do your work here 

        set @min=@min+1 --Increment of current row number
    END

Answer 5

您始终不需要光标。你可以用while循环来完成它。你应该尽可能避免使用游标。虽然循环比游标快。

循环遍历临时表的所有行，并为每一行调用存储过程

5 个答案: