Bulksgewijs invoegen met een dynamische waarde voor een kolom

Dit is een van de weinige keren dat een cursor eigenlijk ideaal is in SQL Server. Hier is een manier. Zodra u de PRINT-instructie ziet en tevreden bent, kunt u deze becommentariëren en de twee regels eronder verwijderen. Ik heb wat logica toegevoegd om de bestandsnaam en een verwerkingsdatum toe te voegen die meestal nodig is, maar je tabeldefinitie zou deze kolommen nodig hebben. Het moet het idee overbrengen.

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--Set some variables
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DECLARE @dt VARCHAR(10)                                                         --date variable but stored as VARCHAR for formatting of file name
DECLARE @fileLocation VARCHAR(128) = 'E:\DATA_TRANSFERS\'                       --production location which is \\issqlstd01 but the xp_dirtree didn't like this
DECLARE @sql NVARCHAR(4000)                                                     --dynamic sql variable
DECLARE @fileName VARCHAR(128)                                                  --full file name variable


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--Get a list of all the file names in the directory
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IF OBJECT_ID('tempdb..#FileNames') IS NOT NULL DROP TABLE #FileNames
CREATE TABLE #FileNames (
    id int IDENTITY(1,1)
    ,subdirectory nvarchar(512)
    ,depth int
    ,isfile bit)
INSERT #FileNames (subdirectory,depth,isfile)
EXEC xp_dirtree @fileLocation, 1, 1





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--Create a cursor to fetch the file names
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DECLARE c CURSOR FOR
select subdirectory from #FileNames where isfile = 1

OPEN c
FETCH NEXT FROM c INTO @fileName

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--For each file, bulk insert 
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WHILE @@FETCH_STATUS = 0
    BEGIN

        SET @sql = 'BULK INSERT Employee_Table FROM '''+ @fileLocation + @fileName +''' WITH (FIELDTERMINATOR = ''\t'',KEEPNULLS,ROWTERMINATOR = ''0x0a'')'


        --Try the bulk insert, if error is thrown log the error 
        --Also update the Table Columns which aren't a part of the original file (load date and original file name)
        BEGIN TRY
            PRINT(@sql)
            --EXEC(@sql)
            --UPDATE Employee_Table SET OrigFile = @fileName, LoadDate = GETDATE() WHERE OrigFile IS NULL
        END TRY
        BEGIN CATCH
            SELECT ERROR_MESSAGE()
        END CATCH

        FETCH NEXT FROM c INTO @fileName
    END

CLOSE c
DEALLOCATE c

GO