/*
* call-seq:
* res.num_fields()
*
* Returns the number of fields (columns) in the query result.
*
* Similar to <tt>res.result[0].length</tt> (but faster).
*/
static VALUE
pgresult_num_fields(obj)
VALUE obj;
{
int n;
n = PQnfields(get_pgresult(obj));
return INT2NUM(n);
}