Single row fetch from backend

Hi

Does postgres support the notion of single row fetch without having to use 
cursors with libpq.

What I want to do is something like
 myResult = PQexec(myConnection, "select * from mytable where field >= ''")
 for (int i = 0; i < PQntuples(myResult); i++) {   PQfetchRow(myResult); }

Ie. rows are retrieved from the backend only on request. I can then control
when I want to stop retreiving rows.

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Regards
Theo