The worst part about ORM is that there are so many systems for doing it. Out of six employers, two had their own handrolled ORM systems. I think what's going o

The worst part about ORM is that there are so many systems for doing it. Out of six employers, two had their own handrolled ORM systems. I think what's going on here is that elementary mapping of objects to and from relational tables is really easy and obvious, so people go ahead and implement it. Unfortunately once you get past the easy bits and have to worry about breaking objects across tables, foreign keys, transactions, caching, and other fun stuff, you have a great big mess and you probably messed up some of the edge cases.