I'm sorry, that code is a test code, and oid value is written directly in the 
code.
I'm sure there are large objects whose id is oid and oid+1.

In fact, if I get rid of PQsendQuery statement, I can open the two large
objects because that code displays nothing.

In my survey, if I execute PQsendQuery between two lo_open,
the latter lo_open returns -1.
And this situation continues until the connection is disconnected.

Best regards.

Tom Lane wrote:
> "Yuichi Tanaka" <yuichi_tan...@cybozu.co.jp> writes:
> > This program displays "error: second lo_open".
> 
> Where did you get the oid value from?  What makes you think that one
> more than that oid is also a large object?
> 
>  regards, tom lane

----
Yuichi Tanaka (yuichi_tan...@cybozu.co.jp)

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