Db4o Client/Server Mode without persistent class : Unique Constraint / Indexes

问题

It's not clear for me from the documentation if a db4o server in java without persistent class can handle unicity constraint, I see nothing saying no, but the way to configure it on the server we need the class on the classpath. (and I don't want that in that case).

Same question for indexes ?

Thanks in advance.

回答1:

My recommendation: Don't do a db4o server without the persistent classes available. That leads to countless issues.

Anyway, you should be able to just specify the full qualified class-name as a string and it should work.

    config.objectClass("your.package.YourClass").objectField("id").indexed(true);
    config.add(new UniqueFieldValueConstraint("your.package.YourClass", "id"));

来源：https://stackoverflow.com/questions/8187130/db4o-client-server-mode-without-persistent-class-unique-constraint-indexes