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

TONY J.Y. tjiang at mrf.com
Wed Dec 5 12:27:17 PST 2001


I am using the PGLIB C lib to connect to PgSql to finish the query of
the GEOMETRY of a table.

At first, everything is OK. I can insert, update, delete and select of
whatever I want. But the geometry data is very small one.

So I wanted to try a bigger one. I uploaded a ESRI shape file into database
which in the attachment --- Canada.sql. Then I try the query.

    res = PQexec(conn, "DECLARE mycursor BINARY CURSOR FOR select gid, name,
asbinary(the_geom) from canada");

    if (!res || PQresultStatus(res) != PGRES_COMMAND_OK)
        fprintf(stderr, "DECLARE CURSOR command failed\n");

    res = PQexec(conn, "FETCH ALL in mycursor");
    if (!res || PQresultStatus(res) != PGRES_TUPLES_OK)
        fprintf(stderr, "FETCH ALL command didn't return tuples

Then I got the error when try to "FETCH ALL in mycursor".

Could you help me to figure out the problem? Thanks. I have attached
the files needed for you.

Best regards,

Tony Jiang, MSc
Research & Development Programmer/Analyst
MRF Geosystems Corp (www.mrf.com)
Suite 700, 665 8th Street SW,
Calgary, AB T2P 3K7
(403) 216-5515 ext:226

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