Is an ORM applicable for a non-CRUD database?

My opinion is that an ORM tool could be useful for you but you really need to delve into it to see for yourself. Remember when you use an ORM tool you are not forced to use only that to connect to your database. ORM tools in general make the most sense for applications that store data in a very object like structure.

For instance your user code might be the place to start. Usually you only create 1 user at a time, you edit 1 user at a time, you check if 1 user is logged into. It also makes sense for things where you would return a list of results like Order Lines.

Where I have run into issues with ORM tools is when you have complex data that requires multiple joins especially back to the table you started in. For those cases you might want to keep doing what you are doing. Overall, ORM tools are great but they are like a lot of other things in software development.

Try them out on a small part of your code and use them where they work and don't where they don't. Ultimately, you are the one that will have to deal with and maintain whatever you make. Just educate yourself on bernate and I am sure you will know what to do!

I think that ORM (I would suggest using the JPA standard, probably with bernate as the provider) could suit your project. It is fairly traditional, as you say, for database columns to map directly onto object fields. If you need to keep your existing database structure (which apparently doesn't map at all well to your objects), then you might find that its more trouble than it's worth to use ORM.

While it's certainly possible to use ORM to map to a specific database schema - perhaps because it's used by other systems - my view is that one of the biggest advantages of ORM is that you can almost ignore the schema. Once you design your objects, and tell hibernate about them, hibernate will create whatever tables it needs.

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