Firebase Data Connect client SDKs let you call your server-side queries and mutations directly from a Firebase app. You generate a custom client SDK in parallel as you design the schemas, queries and mutations you deploy to your Data Connect service. Then, you integrate methods from this SDK into your client logic.
As we've mentioned elsewhere, it's important to note that Data Connect queries and mutations are not submitted by client code and executed on the server. Instead, when deployed, Data Connect operations are stored on the server like Cloud Functions. This means you need to deploy corresponding client-side changes to avoid breaking existing users (for example, on older app versions).
That's why Data Connect provides you with a developer environment and tooling that lets you prototype your server-deployed schemas, queries and mutations. It also generates client-side SDKs automatically, while you prototype.
When you've iterated updates to your service and client apps, both server- and client-side updates are ready to deploy.
This is an excerpt from the Data Connect documentation. When you sign up for the Data Connect preview, you'll have full access to this guide, which covers:
- Generating Android SDKs automatically as you develop your schema
- Setting up generated SDKs in your client code
- Instrumenting your client code to interact with the local Data Connect emulator
- Data types in generated SDKs.