Large Object support

Are there any plans to have direct support for large objects for efficient streaming of data?

My use case: my webapp supports uploads of binary data files. These files are stored with TOAST (bytea) which is fine: these files are not directly downloaded via the app, and even if they were, we're talking 10s of MB, so I'm not worried about memory footprint for an individual record. HOWEVER, part of the requirements for this app is that all these files can be downloaded in a single zip file. This can be 100s of MBs. My plan: kickoff a background task that builds the zip file, then stores the zip file in PG as a large object. The question then is: providing an efficient download via my webapp (aiohttp).

I could stream it with a loop around, e.g.:

SELECT lo_get(data_oid, :offset, :chunksize) from zipstorage where id = :id

where chunksize might be 1MB and offset increases by 1MB with each iteration, stopping the iteration when the returned data is < 1MB.

Might there be a more direct, efficient way? E.g., as with psycopg2's lobject?

Other suggestions most welcome.

Thanks!

この issue では asyncpg のファイル、テスト、エントリーポイントが指定されていません。まず提案されている lo_get ループとリンク先の psycopg2 lobject リファレンスを確認し、次に直接的なラージオブジェクト対応と見なせる API の範囲とストリーミング動作を判断してください。