Vb.Net - ExecuteNonQuery Duplicate

Good Day Experts!

I have a Vb.Net application that I am trying to improve the processing speed.  It takes too long to finish when many records in the textfile.

Currently I query the database checking for the keyed value before doing the insert if no duplicate. If I empty the database and take off the Duplicate check it is waaaay faster.

Is it possible to just execute the NonQuery insert...does the system return a distinct error message if keyed value found which I can check for and then bypass to the next record?

Thanks for your ideas,
jimbo99999
Jimbo99999Asked:
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ste5anSenior DeveloperCommented:
Do you need a message for each row? How big are those files?

Normally I would import the entire file into a staging table. Then you can use
INSERT INTO DestinationTable
SELECT ColumnList
FROM StagingTable S
INNER JOIN DestinationTable D ON D.PrimaryKeyColumns = S.PrimaryKeyColumns
WHERE D.APrimaryKeyColumn IS NULL;

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This will copy only the new rows. When your duplicate check involves more than the primary key columns, then include them in the JOIN condition.
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CodeCruiserCommented:
You can check for duplicates and insert the row within a same query using something like below

If Not Exists (Select ColumnName From TableName Where ColumnName=Value)
Begin
   Insert Into ...
End
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Jimbo99999Author Commented:
I awarded both contributors with the points since my question was abandoned...we are understaffed and I did not get back to this project in time.
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