Hi, John, On Wed, Sep 20, 2017 at 12:02 PM, John R Pierce <pie...@hogranch.com> wrote: > On 9/20/2017 6:30 AM, Igor Korot wrote: > > Hi, guys, > > On Wed, Sep 20, 2017 at 12:20 AM, Allan Harvey > <allan.har...@libertyonesteel.com> wrote: > > How do I properly check if the record exists from libpq? > > Igor, > I use PQntuples() to check the number of ... tuples, for > 0 > > I was actually curious - isn't it what "PGRES_COMMAND_OK" for? > IIUC, this constant indicates successful query run, but no records was > generated. > > Or am I missing something and I will have to check PQntuples()? > > > a query that returns zero rows is still successful.
>From the documentation: https://www.postgresql.org/docs/9.1/static/libpq-exec.html [quote] PGRES_COMMAND_OK Successful completion of a command returning no data. [/quote] No data = no rows, right? Thank you. > > -- > john r pierce, recycling bits in santa cruz -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
