Upsert in SQLite with running total if record is found

Question

I would like to upsert data to a table in SQLite, but the column being updated (if the record is found) must be a running total. I am using a parameterized query, and am having

Answer 1

OK so this is working for me:

INSERT OR REPLACE INTO TABLE (ID, Quantity) 
VALUES (:ID, 
        COALESCE(
          (SELECT Quantity FROM TABLE WHERE ID = :ID) + :Quantity_change, :Quantity_change));

Thanks to this SO link for the help.