Question

I’m trying to use a simple mysql database but tweak it so that every field is backed up up to an indefinite number of versions. The best way I can illustrate this is by replacing each and every field of every table with a stack of all the values this field has ever had (each of these values should be timestamped). I guess it’s kind of like having customized version control for all my data..

Any ideas on how to do this?

Answer 1

The usual method for “tracking any changes” to a table is to add insert/update/delete trigger procedures on the table and have those records saved in a history table.

For example, if your main data table is “ItemInfo” then you would also have an ItemInfo_History table that got a copy of the new record every time anything changed (via the triggers).

This keeps the performance of your primary table consistent, yet gives you access to the history of any changes if you need it.

Here are some examples, they are for SQL Server but they demonstrate the logic:

My Repository table
My Repository History table
My Repository Insert trigger procedure
My Repository Update trigger procedure