> If I use the libpgtcl library, I find it can only get a file
> descriptor of '-1' returned by pg_lo_open.
> If I use pgintcl, I find it can only get a file descriptor of '0'
> returned by pg_lo_open, followed by an error message:
> ERROR: lo_write: invalid large obj descriptor (0)
Are you doing all your large object calls inside transaction blocks,
as required? If not, the large object descriptors will not be valid.
Send BEGIN, operate on a large object, then send COMMIT.
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