Thread: Read Cursor to C

Hi, my name is Gabriel and I need to read binary data
from de DB and write it to a file in C. How do I use
this cursor? Howm do I read the data from the cursor
after the query is done and write it to C?

Thank you for the help,

/******************************************\
* Gabriel da Silva Beletti                 *
* ------------------------                 *
* Ciências da Computação                   *
* Computing Science                        *
*                                          *
* UNIVERSIDADE FEDERAL DE SANTA CATARINA   *
* FEDERAL UNIVERSITY OF SANTA CATARINA     *
*                                          *
* Site..: http://www.inf.ufsc.br/~gbeletti *
* E-mail: gbeletti@inf.ufsc.br             *
* UIN   : 119620783                        *
\******************************************/


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> 
> 
> Hi, my name is Gabriel and I need to read binary data
> from de DB and write it to a file in C. How do I use
> this cursor? Howm do I read the data from the cursor
> after the query is done and write it to C?
> 
Use the libpq interface: 

PQexec(.., "DECLARE <cursorname> BINARY CURSOR FOR <query>")

PQexec(.., "FETCH ALL IN <cursorname>")

PQgetvalue(.., .., ..)

PQexec(.., "CLOSE <cursorname>")

See the doc on libpq for details. 
Regards, Christoph