How to stream data to database BLOB using Hibernate (no in-memory storing in byte[])

Question

I\'m looking for a way to stream binary data to/from database. If possible, i\'d like it to be done with Hibernate (in database agnostic way). All solutions I\'ve found invo

Answer 1

For those looking for same thing.

My bad, the code works as supposed to (streams without trying to copy to memory) for PostgreSQL (and probably lots of others). The inner work of Hibernate depends on selected dialect. The one I used in the first place overrides direct use of streams in favor of BinaryStream backed by byte[].

Also there are no problems with performance, since it loads only OID (number) in case of PostgreSQL, and probably lazy loads data in case of other dialects (including byte[] implementation). Just ran some dirty tests, no visible difference in 10000 loads of entity with and without binary data field.

Storing data in database seems to be slower than just saving it on disk as external file though. But it saves you a lot of headache when backing up, or dealing with limitations of particular file system, or concurrent updates, etc. But it's an off-topic.