Doubts about using IF and else

I need to create a condition that if the barcode does not exist in the sdpj_proc_inter table, I have to move it to a processed folder with a slope, would anyone have any examples of how I could be doing this condition?

 

 

 

Here is my code that I read from the file and validate whether the barcode exists or not in the sdpj_proc_inter table of the database, existing I process the file, insert in the database and generate a service log and move the file to the folder processed. But I would like to know how I could do to this condition if it does not exist I generate the log stating that it does not exist, even in the log part all ok but the problem is how will I implement a condition to move that file to the processed if this barcode does not exist there in the database. How could I do it?