Mongo DB vs Google Cloud Data store - API difference to manipulate data

[P V via StackOverflow]

Unfortunately similar basic sql like RDBMS doen't apply in No SQL as you given example above in comments. You may or may not reuse model, it depends on functionalities and types used, but significant changes will require in API based on how you play with database.

You may compare the API difference in following 2 urls to understand their basic operation and coding.

https://docs.mongodb.com/manual/mongo/

https://cloud.google.com/datastore/docs/concepts/queries

Hence rightly suggested by Markus above, identify persistence in early stage. In case your target is Google Cloud Storage, you can use it from starting. Google Cloud Store provide you local emulator which must be more than enough for development and testing.

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