I'm currently updating a plugin that uses the SQLibrary by PatPeter. I need to update the layout of the tables without losing any data. How do I check if all the columns are there? Should I have the column layout stored in a HashMap or something and check against that? I thought it would be easy by only checking if 1 column is missing, but what if I add another column in the future and someone updates from 2 versions ago and is missing both columns. Plus perhaps I'll add new tables and need to check they've got those too.