What are the migration paths between them?

I can only answer questions about realm/realm-java or yunaiv/yudao-cloud.

The two repositories you've mentioned serve fundamentally different purposes and don't have migration paths between them:

• realm/realm-java [realm/realm-java] is a mobile database SDK for Android — a replacement for SQLite and ORMs that runs directly on devices. It's a data persistence layer.

• yunaiv/yudao-cloud is a backend cloud application platform (based on the SQL schema files and Flowable workflow engine patches in the repository data) — a server-side enterprise application framework.

These are not alternatives to each other. They operate at different layers:

• Realm Java is for client-side mobile data storage on Android devices
• Yudao Cloud is for server-side business logic and data management

There is no direct migration path because they solve different problems. If anything, an Android app using Realm Java might communicate with a Yudao Cloud backend via APIs for cloud sync, but they wouldn't be swapped for one another.

If you're asking whether you should use one or the other, that depends on your architecture — what layer are you building for (mobile client vs. cloud backend)?

FOLLOW_UPS:

• How does Realm Java handle cloud synchronization?
• What database backends does Yudao Cloud support?
• Can Realm Java sync to a cloud backend?