CHECK for duplicate inside a cursor and pass a ouptut parameter in sql server 2008

Question

Hi All,
I am inserting a value into a table, Before inserting i am checking that record already exists or not in the target table, If its existsing i am making an entry into errorlog table and set the output parameter to 'errorlog' . This is inside the cursor, as
il be passing multiple values. Next is I have separate query to get the new record which is not in the target table. Using EXCEPT i get the new record and i insert into a main table. after insertion i set output as 'success'. 
Here while executing the procedure i pass a duplicate value and a new value. As it is in cursor,first it will insert into errorlog and set output parameter as 'errorlog' .Next it will insert a new record into main table and set output parameter as 'Success'.
So on completion of the execution of the procedure i get output as success.
But i should get as errorlog. I should get success only on no errors in the procedure. How i can i achieve this? Please help me.
Below is my code
IF NOT EXISTS(SELECT Beginmilepost,BeginTrackName,Endmilepost,EndTrackName
FROM SSDB_Segment WHERE BeginMilepost>=@BegMP AND EndMilepost<=@EndMP AND SearchID = @SearchID AND Reference = 'Range')
BEGIN
                 Declare C_Max1 Cursor FOR
(SELECT Beginmilepost,BeginTrackName,Endmilepost,EndTrackName FROM SSDB_Segment WHERE BeginMilepost = @BegMP AND EndMilepost = @EndMP AND  BeginTrackName = @BegtrkName 
AND EndTrackName = @EndTrkName  AND SearchID = @SearchID)
  Open C_Max1
  FETCH FROM C_MAX1 INTO @BeginMilepost,@BTrackName,@EndMilepost,@ETrackName
WHILE(@@FETCH_STATUS=0)
BEGIN
IF OBJECT_ID ('tempdb..#temp') IS NOT NULL
BEGIN
      DROP TABLE #temp
END--IF
Select BeginLatitude,BeginLongitude,BeginTrackName,BeginMilepost,BeginMilepostPrefix,BeginMilepostSuffix,EndLatitude,EndLongitude,EndTrackName,EndMilepost,TrainType into #temp
FROM
SELECT BeginLatitude= case when @BegLat = 0 THEN NULL ELSE @BegLat end ,BeginLongitude= case when @BegLong=0 THEN NULL ELSE @BEgLong end ,@BTrackName AS BeginTrackName,ROUND(@BeginMilepost ,3) AS BeginMilepost,
BeginMilepostPrefix= CASE WHEN @BegPrefix = 'null' THEN NULL ELSE @BegPrefix END,BeginMilepostSuffix= CASE WHEN @BegSuffix  = 'null' THEN NULL ELSE @BegSuffix  END,
EndLatitude=case when @EndLat =0 then NULL else @EndLat end,EndLongitude=case when @Endlong = 0 THEN NULL ELSE @Endlong END,@ETrackName AS EndTrackName,ROUND(@EndMilepost ,3) AS EndMilepost,@TrainType AS TrainType 
UNION ALL
select BeginLatitude,BeginLongitude,BeginTrackName,ROUND(BeginMilepost,3) AS BeginMilepost,BeginMilepostPrefix,BeginMilepostSuffix, EndLatitude,EndLongitude,EndTrackName,ROUND(EndMilepost,3) AS EndMilepost,TrainType from SSDB_MaximumPermissibleSpeed)data
group by  BeginLatitude,BeginLongitude,BeginTrackName,BeginMilepost,EndLatitude,EndLongitude,EndTrackName,EndMilepost,BeginMilepostPrefix,BeginMilepostSuffix,TrainType
having COUNT(*)>1
SET @COUNT= (select count(*) from #temp )
Print @COUNT
IF @COUNT>=1
BEGIN
 INSERT INTO ErrorLog_Asset (
                                    ErrorCode,
                                    ErrorMessage,
                                    TableName,
                                    MilepostPrefix,
                                    Milepost
SELECT
                                 '1',
                                 'Already exists at BeginMp '+ CAST(@BeginMilepost  as varchar) +',EndMp '+ CAST(@EndMilepost as varchar) +' ,Beginlat
'+CAST(@BegLat   as varchar)
                                 +' ,Endlat '+CAST(@EndLat   as varchar)+', BeginTrackName '+@BTrackName  +' and EndTrackName '+@ETrackName
                                 'MaximumPermissibleSpeed',
                                  CASE WHEN @BegPrefix = 'null' THEN NULL
ELSE @BegPrefix END ,
@BeginMilepost  
SET @output = 'Errorlog'
END
 IF OBJECT_ID ('tempdb..#Max') IS NOT NULL
BEGIN
 DROP TABLE #Max
END--IF
 Select BeginLatitude,BeginLongitude,BeginTrackName,BeginMilepost,BeginMilepostPrefix,BeginMilepostSuffix,EndLatitude,EndLongitude,EndTrackName,EndMilepost,TrainType into #Max from
       (SELECT BeginLatitude= case when @BegLat = 0 THEN NULL ELSE @BegLat end ,BeginLongitude= case when @BegLong=0 THEN NULL ELSE @BEgLong end ,@BTrackName AS BeginTrackName,ROUND(@BeginMilepost ,3)
AS BeginMilepost,
              BeginMilepostPrefix= CASE WHEN @BegPrefix = 'null' THEN NULL ELSE @BegPrefix END,BeginMilepostSuffix= CASE WHEN @BegSuffix  = 'null' THEN NULL ELSE @BegSuffix  END,
              EndLatitude=case when @EndLat =0 then NULL else @EndLat end,EndLongitude=case when @Endlong = 0 THEN NULL ELSE @Endlong END,@ETrackName AS EndTrackName,ROUND(@EndMilepost ,3) AS EndMilepost,@TrainType AS TrainType 
except
             select BeginLatitude,BeginLongitude,BeginTrackName,ROUND(BeginMilepost,3) AS BeginMilepost,BeginMilepostPrefix,BeginMilepostSuffix, EndLatitude,EndLongitude,EndTrackName,ROUND(EndMilepost,3) AS EndMilepost,TrainType
from SSDB_MaximumPermissibleSpeed)data
 Declare C_Max2 Cursor FOR
 Select BeginMilepost,BeginTrackName,EndMilepost,EndTrackName from #Max 
  Open C_Max2
  FETCH FROM C_Max2 INTO  @BeginMP,@BeginTrackName,@EnMP,@EnTrackName
WHILE(@@FETCH_STATUS=0)
BEGIN
   IF (Select COUNT(*) from tbl_Trackname )>=1
   BEGIN
 IF (@TrainType IN (SELECT TrainType  FROM SSDB_TrainType )AND (@Speed <>0) AND @BeginMP IS NOT NULL AND @BeginTrackName IS NOT NULL  AND @EnMP IS NOT NULL
 AND @Direction IN (SELECT Direction FROM SSDB_Direction) AND @EnTrackName IS NOT NULL )
 BEGIN-------------
 SET @ID = (Select MAX(MaximumpermissibleSpeedID) from SSDB_MaximumPermissibleSpeed)
IF @COUNT =0
   BEGIN
                      INSERT INTO SSDB_MaximumPermissibleSpeed
BeginMilepostPrefix,
BeginMilepostSuffix,
BeginMilepost,
BeginTrackName,
BeginLatitude,
BeginLongitude,
BeginElevation,
EndMilepostPrefix,
EndMilepostSuffix,
EndMilepost,
EndTrackName,
EndLatitude,
EndLongitude,
EndElevation,
Direction,
Speed,
TrainType,
Description,
InsertUser,
S_ID
                                                 SELECT
  CASE WHEN @BegPrefix = 'null' THEN NULL
  ELSE @BegPrefix END,
                      CASE WHEN @BegSuffix = 'null' THEN NULL
  ELSE @BegSuffix END,
  @BeginMP ,
  @BeginTrackName  ,
  case WHEN @BegLat = 0 THEN NULL
  ELSE @BegLat END,
  CASE WHEN @BegLong=0 THEN NULL
  ELSE @BegLong END ,
  CASE WHEN @BegEle = 0 THEN NULL
  ELSE @BegEle END ,
  CASE WHEN @EndPrefix = 'null' THEN NULL
  ELSE @EndPrefix END,
                      CASE WHEN @EndSuffix = 'null' THEN NULL
  ELSE @EndSuffix END,
  @EnMP ,
  @EnTrackName  ,
  case WHEN @EndLat = 0 THEN NULL
  ELSE @EndLat END,
  CASE WHEN @EndLong=0 THEN NULL
  ELSE @EndLong END ,
  CASE WHEN @EndEle = 0 THEN NULL
  ELSE @EndEle END ,
  @Direction ,
  @Speed ,
  @TrainType ,
  CASE WHEN @Description ='null' THEN NULL
  ELSE @Description END ,
  @InsertUser ,
  @UID     
INSERT INTO SSDB_MaxSpeed_History
                   MSID,
BeginMilepostPrefix,
BeginMilepostSuffix,
BeginMilepost,
BeginTrackName,
BeginLatitude,
BeginLongitude,
BeginElevation,
EndMilepostPrefix,
EndMilepostSuffix,
EndMilepost,
EndTrackName,
EndLatitude,
EndLongitude,
EndElevation,
Direction,
Speed,
TrainType,
Description,
S_ID,
NOTES ,
[Action] ,
InsertUser
                             SELECT 
                      (Select MaximumPermissibleSpeedID from SSDB_MaximumpermissibleSpeed WHERE MaximumPermissibleSpeedID > @ID),
                      CASE WHEN @BegPrefix = 'null' THEN NULL
  ELSE @BegPrefix END,
                      CASE WHEN @BegSuffix = 'null' THEN NULL
  ELSE @BegSuffix END,
  @BeginMP ,
  @BeginTrackName  ,
  case WHEN @BegLat = 0 THEN NULL
  ELSE @BegLat END,
  CASE WHEN @BegLong=0 THEN NULL
  ELSE @BegLong END ,
  CASE WHEN @BegEle = 0 THEN NULL
  ELSE @BegEle END ,
  CASE WHEN @EndPrefix = 'null' THEN NULL
  ELSE @EndPrefix END,
                      CASE WHEN @EndSuffix = 'null' THEN NULL
  ELSE @EndSuffix END,
  @EnMP ,
  @EnTrackName  ,
  case WHEN @EndLat = 0 THEN NULL
  ELSE @EndLat END,
  CASE WHEN @EndLong=0 THEN NULL
  ELSE @EndLong END ,
  CASE WHEN @EndEle = 0 THEN NULL
  ELSE @EndEle END ,
  @Direction ,
  @Speed ,
  @TrainType ,
  CASE WHEN @Description ='null' THEN NULL
  ELSE @Description END ,
  @UID,
  NULL,
  'INSERT',
  @InsertUser 
set @output='Success'
--IF ((@COUNT >=1) AND (@COUNT =0))
--BEGIN
--  SET @output = 'ErrorLog'
--END
--IF (@COUNT = 0)
-- BEGIN
--SET @output ='Success'
--END
--END
END
END------------------------> 
Deepa

Answer 1

Hi Deepa,
If I understand your question correctly, you would like the @Output parameter to contain the value "Success" only if all rows were successful. As soon as one row was found to be a duplicate, the value of @Output at the end of execution should be "ErrorLog".
Currently, you modify the value of @Output in each iteration of the cursor, so at the end of execution you're left with the last value.
In order to change that to work the way you want it, you need to set the value of @Output in the beginning of execution (before entering the cursor) to "Success", and as soon as there is a duplicate row, you should modify the value to "ErrorLog". This way,
if all rows are successful, the value of @Output will be "Success" at the end of execution. On the other hand, if there is even a single duplicate row, the value of @Output will be "ErrorLog" at the end of execution.
I hope this helps...
Guy Glantser
SQL Server Consultant & Instructor
Madeira - SQL Server Services
http://www.madeirasql.com