使用If/Then/Else更新游标SQL语句

Question

我正在努力弄清楚如何使用If/Then/Else方案进行更新。游标正在抓取select语句中的记录，然后将它们与链接服务器中的不同表进行比较。然后，如果它找到匹配的记录，请更新光标的计数。如果它找不到匹配的记录，则将该行插入表中。

游标在下方，我当前的更新命令仅用于更新记录找到匹配项的计数。

DECLARE @cono INT 
DECLARE @repno NVARCHAR(10) 
DECLARE @date DATETIME 
DECLARE @count INT 

DECLARE cur CURSOR FOR 

SELECT '1' AS PPCONO, 
     b.new_SalesrepId AS PPREP1, 
     MAX(CONVERT(VARCHAR(8), (d.ScheduledStart - c.TimeZoneBias/CAST(24 * 60 AS FLOAT)), 112)) AS PPDATE, 
     COUNT(b.new_SalesrepId) AS PPCOUNT, 
     MAX(CONVERT(VARCHAR(8), (a.ActualEnd - c.TimeZoneBias/CAST(24 * 60 AS FLOAT)), 112)) AS ClosedOn 
     FROM ActivityPointerBase AS a 
      join SystemUserExtensionBase AS b ON b.SystemUserId = a.OwnerId 
      join UserSettingsBase AS c ON c.SystemUserId = b.SystemUserId 
      join ActivityPartyBase AS d ON d.ActivityId = a.ActivityId 
       WHERE b.new_SalesrepId <> '99999999' 
         and a.ActivityTypeCode = '4201' 
         and b.new_SalesrepId is not NULL 
         and a.StateCode = '1' 
         and d.ParticipationTypeMask = '9' 
         and CONVERT(varchar(8), a.ActualEnd - c.TimeZoneBias/cast(24 * 60 as float), 112) >= dateadd(day,datediff(day,1,CONVERT(varchar(8), GetDate(), 112)),0) 
         and CONVERT(varchar(8), a.ActualEnd - c.TimeZoneBias/cast(24 * 60 as float), 112) < dateadd(day,datediff(day,0,CONVERT(varchar(8), GetDate(), 112)),0) 
         /* and CONVERT(VARCHAR(8), a.ActualEnd - c.TimeZoneBias/CAST(24 * 60 AS FLOAT), 112) < CONVERT(VARCHAR(8), GETDATE(), 112) */ 
          group by b.new_SalesrepId, 
             CONVERT(varchar(8), (d.ScheduledStart - c.TimeZoneBias/cast(24 * 60 as float)), 112) 
              order by b.new_SalesrepId ASC; 

FETCH NEXT FROM cur INTO @cono, @repno, @date, @count 

WHILE (@@FETCH_STATUS=0) 
BEGIN 

UPDATE [AS400].S062f7ar.APLUS83MDS.PEPAPPTS01 
SET  PPCOUNT = PPCOUNT + @count 
WHERE PPCONO = @cono 
     and PPREP1 = @repno 
     and PPDATE = @date 

FETCH NEXT FROM cur INTO @cono, @repno, @date, @count 

END 

CLOSE cur 
DEALLOCATE cur 

不知道如何完成SQL中的IF/Then/Else场景。我做了一点研究，也许使用Case是要走的路，但是你可以使用Update命令来做到这一点吗？我在SQL 2008上。

Answer 1

您可以检查记录是否存在，如果是，请执行更新，否则执行插入操作。例如：

DECLARE @cono INT 
DECLARE @repno NVARCHAR(10) 
DECLARE @date DATETIME 
DECLARE @count INT 
DECLARE @closedOn DATETIME 

DECLARE cur CURSOR FOR 

SELECT '1' AS PPCONO, 
     b.new_SalesrepId AS PPREP1, 
     MAX(CONVERT(VARCHAR(8), (d.ScheduledStart - c.TimeZoneBias/CAST(24 * 60 AS FLOAT)), 112)) AS PPDATE, 
     COUNT(b.new_SalesrepId) AS PPCOUNT, 
     MAX(CONVERT(VARCHAR(8), (a.ActualEnd - c.TimeZoneBias/CAST(24 * 60 AS FLOAT)), 112)) AS ClosedOn 
     FROM ActivityPointerBase AS a 
      join SystemUserExtensionBase AS b ON b.SystemUserId = a.OwnerId 
      join UserSettingsBase AS c ON c.SystemUserId = b.SystemUserId 
      join ActivityPartyBase AS d ON d.ActivityId = a.ActivityId 
       WHERE b.new_SalesrepId <> '99999999' 
         and a.ActivityTypeCode = '4201' 
         and b.new_SalesrepId is not NULL 
         and a.StateCode = '1' 
         and d.ParticipationTypeMask = '9' 
         and CONVERT(varchar(8), a.ActualEnd - c.TimeZoneBias/cast(24 * 60 as float), 112) >= dateadd(day,datediff(day,1,CONVERT(varchar(8), GetDate(), 112)),0) 
         and CONVERT(varchar(8), a.ActualEnd - c.TimeZoneBias/cast(24 * 60 as float), 112) < dateadd(day,datediff(day,0,CONVERT(varchar(8), GetDate(), 112)),0) 
         /* and CONVERT(VARCHAR(8), a.ActualEnd - c.TimeZoneBias/CAST(24 * 60 AS FLOAT), 112) < CONVERT(VARCHAR(8), GETDATE(), 112) */ 
          group by b.new_SalesrepId, 
             CONVERT(varchar(8), (d.ScheduledStart - c.TimeZoneBias/cast(24 * 60 as float)), 112) 
              order by b.new_SalesrepId ASC; 

OPEN cur; 

FETCH NEXT FROM cur INTO @cono, @repno, @date, @count, @closedOn 

WHILE (@@FETCH_STATUS=0) 
BEGIN 

    IF EXISTS (SELECT 1 FROM [AS400].S062f7ar.APLUS83MDS.PEPAPPTS01 WHERE PPCONO = @cono and PPREP1 = @repno and PPDATE = @date) 
    BEGIN 
     UPDATE [AS400].S062f7ar.APLUS83MDS.PEPAPPTS01 
     SET  PPCOUNT = PPCOUNT + @count 
     WHERE PPCONO = @cono 
      and PPREP1 = @repno 
      and PPDATE = @date 
    END 
    ELSE 
    BEGIN 
     INSERT INTO [AS400].S062f7ar.APLUS83MDS.PEPAPPTS01 
     (PPCOUNT, PPCONO, PPREP1, PPDATE) 
     VALUES 
     (@count, @cono, @repno, @date) 
    END 

    FETCH NEXT FROM cur INTO @cono, @repno, @date, @count  

END  

CLOSE cur 
DEALLOCATE cur 

Answer 2

您可以使用MERGE，做更新或根据病情插入

MERGE [AS400].S062f7ar.APLUS83MDS.PE. PAPPTS01 T 
    USING (SELECT @cono as  cono, @repno as repno, @date as date) S 
    ON 
    T.PPCONO = S.cono 
    and T.PPREP1 = S.repno 
    and T.PPDATE = S.date 
    WHEN MATCHED 
    SET  T.PPCOUNT = T.PPCOUNT + @count 
    WHEN NOT MATCHED 
    INSERT (PPCONO, PPREP1, PPDATE) VALUES (S.cono, S.repno,S.date)