Hello Sir,
after seeing your 2 videos, I think I understood like the idea of the software - correct me if I'm wrong- there is a bar code scanner right to get the code using opencv and I think with that barcode it will give all the information related to it , based on the database you got ? also I think tgere was some minor bugs going on the execution and some mysql operation are faillig and some of the bugs when you try to change the operator the function don't get all the arguments, I think it should be fine and I can fix those errors and help you complete the project, I liked the idea (that's if I'm correct) and I would like to help , you may tell me if I forgot some errors or I didn't see , I hope that I get chance working with you and thank you Sir.