Hello,
in the C interface documentation there is an example using:
res = PQexec(conn, "DECLARE mycursor CURSOR FOR select * from
pg_database"); if (!res || PQresultStatus(res) != PGRES_COMMAND_OK) { fprintf(stderr, "DECLARE CURSOR command
failed\n"); PQclear(res); exit_nicely(conn); } PQclear(res); res = PQexec(conn, "FETCH ALL in
mycursor");
...etc. So the statements are:
DECLARE mycursor CURSOR FOR select * from pg_database;
FETCH ALL in mycursor;
What's the difference between this and simply doing:
select * from pg_database;
I tried this in psql, the result seemed the same.
What I'm really using, however, is the C++ interface.
Its documentation is not yet complete.
There, too, I tried a version with and without cursor.
The result seems to be the same, but returned int is always 0
for the version without cursor, so I get no information whether
the query succeeded.
Is someone maintaining the C++ interface and its documentation?
Thanks,
Volker Paul
