Re: [BUGS] General Bug Report: Large Object Example testlo fails

Mika.Saari@nokia.com writes:
> libpq++ Large Object Example testlo fails in PostgreSQL 6.5 but NOT
> in 6.4.2. The ERROR message is
>   Connection to database 'template1' failed.
>   PQsendQuery() -- There is no connection to the backend.

> 14. ./testlo template1 testlo test 0

It looks like testlo is now set up so that the first argument is a
conninfo string, not just a database name.  So, something like

    ./testlo dbname=template1 testlo test 0

should work.

If the other method is still being recommended in some documentation
somewhere, then we need to fix that --- where did you find the info?

Also, I'd say that the error message here is pretty awful.  Looks like
that's because PQconnectdb's original message about bogus syntax for a
conninfo string (which might actually have been helpful) is being
overwritten when the PgLargeObject constructors plow ahead with trying
to create and open a large object.  They should not do that if the
underlying connection constructor failed :-(.

Finally, I don't particularly like the fact that both constructors for
PgLargeObject insist on creating and opening a LO.  If you're going to
import() or export() you do not need an LO filehandle; and if you're
going to import() then the constructor-created LO is wasted, making
for a semi-permanent diskspace leak.

Perhaps the best way to design PgLargeObject is to make both creation
and opening "lazy", happening only at the first call that requires 'em.

            regards, tom lane