Convert hardcoded SP into Dynamic Merge ststement(SP)

Question

Hi
I am working on to convert my static Store procedure to Dynamic.
I have created a Store procedure with the help of Mege statement which is inserting new record and updating existing record.
This SP I will use in SSIS Insted of Data Flow Task I will run in Execute SQL Task.
Now my biggest problem is I dont know how to convert static code toi dynamic
Below is my Store procedure code.
As you can see my Source Query
I have a filemaster table as shown below which consist of Input filename,Source table ,Destination table and BBX expression.
Input_Filename SourceTableName      DestinationTableName              BBxKeyDerExpr
CCTFB               ImportBBxCctfb      ArchiveBBxCctfb              SUBSTRING(Col001,1,6)
CEMXR               ImportBBxCemxr      ArchiveBBxCemxr              SUBSTRING(Col001,1,10)
In my source query I want to change the value of Source table ,Destination table and BBX expression dynamically on the basis of input file.
Purpose of making dynamic is that I have created separate sp for all the input, my clients want to have sungle dynamic sp which will execute on the basis of input file.this input file name I wil get fromm  variable which i have created in SSIS Package.
Lets consider @File_name is the variable in package which store the file name
if file name is CCTFB then my query should take the Source table ,Destination table and BBX expression value from file master table.
like that I have 100 of source query and evry query have diffrent number of columns.
how can I change the column number in uodate and insert statement dynamically on run time.
CAST(SUBSTRING(Col001,1,6) + SUBSTRING(Col002,1,10)  AS varchar(100)) :-It creates a key for comparing, this value i can take it from filemaster
HASHBYTES('MD5', CAST(CHECKSUM(Col001, Col002,Col003,Col004) AS varchar(max))) -here numberv of column need to be changed .
(SUBSTRING(SOURCE.Col001,1,6) + SUBSTRING(SOURCE.Col002,1,10)) this condition also i can take it from file master.
ALTER PROCEDURE [dbo].[SP_Archive_using_merge_FDOOP]
AS
--Version 0.2(latest)
BEGIN
  SET NOCOUNT ON
  DECLARE @Source_RowCount int
  DECLARE @New_RowCount int
  DECLARE @updated_Rowcount int
  DECLARE @Matched_record int
  DECLARE @TimeIn smalldatetime
  DECLARE @LatestVersion int
  SET NOCOUNT ON
  ----FDOOP--
  SELECT     @TimeIn = GETDATE()
  SELECT     @LatestVersion = 1
  SELECT     @Source_RowCount = COUNT(1)   FROM
ImportBBxFDOOP ---To get source record count
  MERGE Archive.dbo.ArchiveBBxFDOOP TARGET     --Target Table
  USING (
SELECT *,
    CAST(SUBSTRING(Col001,1,6) + SUBSTRING(Col002,1,10)  AS varchar(100)) BBxKey,
    HASHBYTES('MD5', CAST(CHECKSUM(Col001, Col002,Col003,Col004) AS varchar(max))) RowChecksum
  FROM dbo.ImportBBxFDOOP) AS SOURCE  ---Source Query
  ON  (SUBSTRING(SOURCE.Col001,1,6) + SUBSTRING(SOURCE.Col002,1,10)) = target.BBxKey
  AND (target.LatestVersion = 1 OR target.LatestVersion IS NULL)
  WHEN MATCHED AND (source.BBxKey = Target.BBxKey AND source.RowChecksum <> TARGET.RowChecksum) THEN
UPDATE SET
  TARGET.TimeIn = @TimeIn,
  TARGET.BBXKey = SOURCE.BBXKey,
  TARGET.RowChecksum = SOURCE.RowChecksum,
  TARGET.Col001 = SOURCE.Col001,
  TARGET.Col002 = SOURCE.Col002,
  TARGET.Col003 = SOURCE.Col003,
  TARGET.Col004 = SOURCE.Col004,
  TARGET.LatestVersion = 0
  WHEN NOT MATCHED THEN --For New record
  INSERT (TimeIn, BBXKey, RowChecksum, Col001, Col002,Col003,Col004, LatestVersion)
  VALUES (GETDATE(), SOURCE.BBXKey, SOURCE.RowChecksum, SOURCE.Col001, SOURCE.Col002,SOURCE.Col003,SOURCE.Col004, @LatestVersion);
  SELECT
    @New_RowCount = @@ROWCOUNT  --to get new inserted count
  SELECT
    @Source_RowCount Source_Row,
    @New_RowCount New_inserted,
    @Matched_record
--select * from filemaster
---To get the inserted,updated and matched record
DECLARE @rowcounts TABLE
    mergeAction nvarchar(10)
select    @New_RowCount=[INSERT]
,        @updated_Rowcount=[UPDATE]
,        @Matched_record=[DELETE]
from    (
        select    mergeAction,1 rows
        from    @rowcounts
        )p
pivot
    count(rows)
FOR    mergeAction IN
(    [INSERT], [UPDATE], [DELETE])
) as pvt
print    '@New_RowCount = ' + cast(@New_RowCount as int)
print    '@updated_Rowcount = ' + cast(@updated_Rowcount as int)
print    '@Matched_record = ' + cast(@Matched_record as int)
END
I am able to get inserted and updated rowcount, but not able to get the matching records count.
Please do thee needful help.
please do let me know incase of required any input
Regards,
Vipin jha
Thankx &amp; regards, Vipin jha MCP

Answer 1

I would strongly recommend that you write one static stored procedure for each table. If you want a single DB interface from your SSIS task, you could have a main procedure that forks off to the table-specific procedure. If you use a standard naming convention,
all the procedures have the same interface, this can actually be done very simple as EXEC permits you to say:
EXEC @spname @par1, @par2, ...
This will fire off the stored procedure of which the name is in @spname.
But trying to write a single stored procedure for all tables, it is hardly recommendable. Particular, dynamic SQL is an advanced feature, and given the level you have shown in the previous posts, I'll be blunt and say it is not for you.
Overall - in a relational database a table is supposed to model a unique entity with a unique set of attributes. For this reason, something like a dynamic table name does not make sense as long as we are talking about a properly designed database.
Erland Sommarskog, SQL Server MVP, [email protected]