Setting buttons (false, true) procedure won't work!

i have a little problem about 3 Buttons procedure (SAVE, UPDATE, DELETTE)

So when i scan product and the product existe on the database only the UPDATE and DELETTE BUTTON can be activated

But if i scan product and result is NULL mean product not exist ( Picture 1) i want only Button ( SAVE) Activated others button No

Picture 1:

and here is the blocks

Sql code :


thank you for you help

please any one can help me

Please be patient and don’t spam. When someone knows the answer they will reply.

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