Tarantool java connector provides API to select/update/insert/delete/... tuples in spaces. The first argument in these API methods is a space ID. There is no documentation for this API and I don't clearly undestand how to get these IDs.
The sample code from github gets IDs evaluating box.space.<space>.id - not using API but directly "writing" command into socket... It seems this is not a good approach (?).
As I see system spaces _space/_vspace have constant IDs = 280/281. Is it good approach to use these constants to select spaces IDs?
UPD: I found constant _VSPACE = 281 in the class SQLDatabaseMetadata. It's used in Tarantool JDBC driver. It's protected.
You are right. You need to fetch space id-name mapping from _VSPACE first and then use these values to perform requests against certain spaces. Or you can lean on the fact that a first user-defined space has id 512, then next one 513, etc.
We plan to support automatic schema loading and space names, but don't support it yet: https://github.com/tarantool/tarantool-java/issues/137