Reading and Updating the table at the same time

Hi all
I need to read from a table to check whether a record exist in there or not, then if not add the record to the table (in the same dataflow). Is there any way to use a table as a source and as a target at the same time?
While I'm doing this procedure, I don't want to add a record that I had inserted before twice (I need to get the latest veriosn of the table when I'm working with that). For example, in the same process, when I check the table and the record was not there, I insert the record, I read the table again , if this time again I want to read the same record that I had inserted just before, does DS distingish that, or all records will be comitted based on the commit size which is by default 1000?
I can not change the commit size to 1 to tell DS to commit record by record, as I have turned on the transactional load and the commit size is disabled for me.
Do you have any experience about my problem?
Any help is greatly appreciated.

You need two dataflows. A first that reads your source and inserts/updates the lookup table. And then you read your source again and use the now current lookup table.
Even if you would set the commit rate to 1 it would not help as there are so many buffers between the transforms. What you would require is that only one row is in the dataflow at any given time - and that would take ages.

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