Well... best I can do is answer in English, but here goes:
To get the GFC user ID into your database, you'll need to obtain the
fcauth cookie value and use it to authenticate a REST API call to:
https://www.google.com/friendconnect/api/people/@viewer/@self?fcauth=<your
fcauth>
The response will look like:
{"entry":{"id":"___","name":{"formatted":"___","honorificPrefix":"","additionalName":"","familyName":"","givenName":"___","honorificSuffix":""},"displayName":"___"}}
You can then parse the JSON response, grab the entry.id value, and use
it in your database.