[postgis] Why is there the limitation of PGLIB to get the cursor?

[TONY J.Y.]

Dave,

          I went to the linux server where the database was located. Ran the
psql session to declare
          the big cursor and fetch all in the cursor. there was no error
there. I could declare the cursor,
          and fetched all rows from the cursor.  So PostgreSQL server-side
is OK.  The asbinary function
          is OK too.

          I ran my program at client side (Win2K Pro with libpq).  There
came the error message when the
          geom data is bigger:

         "char *PQerrorMessage(const PGconn* conn);"
          ********************************************************
                Error = pqReadData() --  read() failed: errno=0

          ********************************************************
          So there is some limit in the pqReadData() --  read() of the C
library libpq, isn't there?

../Tony

----- Original Message -----
From: "Dave Blasby" <dblasby at refractions.net>
To: <postgis at yahoogroups.com>
Sent: Thursday, December 06, 2001 10:42 AM
Subject: Re: [postgis] Why is there the limitation of PGLIB to get the
cursor?


> Tony,
> I looked at your code and it looks like it should work.   I suggest you
> open a "psql" session to the DB and type in all the commands that your
> program sends to the database.  When you execute the "FETCH ALL"
> command, you should get an error message.
>
> You could also call the "char *PQerrorMessage(const PGconn* conn);"
> function after the "FETCH ALL" command fails.
>
> Hopefully the error message will guide you as to the problem.
>
> The binary cursor is only limited by your machine's memory.
>
> dave
>
>
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