Any competitors to db4o on compact framework?

Question

We've been trying db4o for persisting objects on the compact framework. It works very well from our tests so far. However, it appears they are on the expensive side for small startups with minimal units needed.

Does anyone know of any similar object databases for the compact framework? How about a open source one that is free for commercial use? :)

Thank you.

EDIT: We're really looking for an object database. We don't want to create our own persistence framework at this point and would prefer being able to just save/retrieve the actual object trees.

Answer 1

How about SQL Server CE, VistaDB or SQLite?

Answer 2

Well, if you're using Java:

Berkeley DB look like it could be right up your alley

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Commercial, but IIRC license costs aren't very high.

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Answer 3

I haven't used it and I'm not sure what the commercial licensing is like, but this might be worth looking at:

Perst - An open source, object-oriented embedded database

Answer 4

A free for commercial use .NET Object database is Eloquera ( http://www.eloquera.com ).

"Eloquera is a native .NET object database.

• Save the data with a single line of code
• 1TB+ max database size
• List item
• SQL and LINQ queries
• Simultaneous user access
• Security settings
• Has genuine C/S architecture, has desktop mode available
• Supports in-memory database for the fast data processing and many more
• it is completely FREE for commercial use."