hi
how ican perepare our data save in db every 3 hours for apriori?

You may export the data from the database to a text file in the proper format and they apply Apriori to the text file to obtain the result.

But it depends on your implementation of Apriori. If you are using the implementation from the SPMF software, then you should read the documentation to see which format is required as input.

Best