Hello, I need to implement some database access in my code, and my knowledge of databases is pretty basic (mostly MySQL ans flat un-indexed tables). Can somebody point me to advanced tutorials on database independent code? For example I can't find a way to tell what methods from DBI and family can I use without concern that the code will break if tomorrow the database engine will have to change. Also I am trying to figure out what is the most commonly accepted way of storing complex data structures like arrays-of-hashes-of-hashes-of... in databases. The first thing that comes to my mind is describing the entire branch in each table row, in other words working the enumeration back to the root of the structure, ordering the rows accdording to key and array index occurences. This however does not seem very efficient as far as table size management goes. Some preliminary searching turned up a possibility of storing XML as table data which also seems too inefficient to me. So anyway, if someone could share a good reading on the subject that he came upon would be most helpful.
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