BLOBs docs

Hi.

I looking for some good documentation about large objects. Is it
possible to find? I mean, is there any better description than
short brief involved in Postgres docs? I have to use BLOBs, but I
can't find, ie., how can I open them, close or read and write.
There's notching about SQL functions like lo_open, lo_close,
lowrite and loread. I can only read about C functions, but no
description about access to BLOB from SQL (only few words about
lo_import and lo_export).

Could You tell where I can read more? Thanx

MJS



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