How to import google cloud spanner data into local emulator environment?

I exported a spanner database on google cloud spanner UI page. Saved it to cloud storage. Also downloaded it to local environment.

I found a backup/restore guide here, it's for real cloud environment.

If import the data to spanner emulator, how to do?

Solution

That is currently not possible:

The Spanner emulator will always start without any instances and databases.
Any database that you create will always start out empty
The emulator does not support backup and restore operations
Any data that you create while the emulator is running will be lost when it is shut down