Getting errors when trying to insert data into a table in Oracle

Question

I am using python 2.7 and the cx_Oracle module. When I try to run the following query:

UPDATE bs_cart
    SET qty = qty + :moreBooks
    WHERE userid = :userID 
    AND isbn = :bookNumber;

IF SQL%ROWCOUNT = 0 THEN
    INSERT INTO bs_cart
    (userid,isbn)
    VALUES
    (:userID,:bookNumber)

using Cursor.execute() from cx_Oracle I get the following error:

DatabaseError: ORA-00911: invalid character

When I put it in SQL plus it says:

SP2-0734: unknown command beginning "IF SQL%ROW..." - rest of line ignored.

I am trying to make the cart UPDATE if a user already has the selected book in the cart and INSERT if there are no current copies of the book they want in the cart.

The execute method looks like:

ds.execute(sql,moreBooks=howMany,userID=userLoggedIn,bookNumber=booksToBuy)

and each of the parameters are user generated using rawinput() and then checked against a regular expression.

Answer 1

You need to enclose your statements in begin/end Oracle blocks.

Something like:

BEGIN
  UPDATE bs_cart
  SET qty = qty + :moreBooks
  WHERE userid = :userID 
  AND isbn = :bookNumber;

  IF SQL%ROWCOUNT = 0 THEN
     INSERT INTO bs_cart (userid,isbn)
     VALUES (:userID,:bookNumber);
END;