Jak hromadně vložit s dynamickou hodnotou pro sloupec

Toto je jeden z mála případů, kdy je kurzor na serveru SQL Server skutečně ideální. Zde je způsob. Jakmile uvidíte příkaz PRINT a budete spokojeni, můžete jej okomentovat a odkomentovat dva řádky pod ním. Vložil jsem nějakou logiku, abych přidal název souboru a zpracované datum, což je obvykle potřeba, ale vaše definice tabulky by tyto sloupce potřebovala. Mělo by to dostat nápad.

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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