static int callback(void *NotUsed, int argc, char **argv, char **azColName){
  int fd = rb->open("/out", O_WRONLY|O_APPEND);
  char buf[512];
  int i, ret;
  for(i=0; i<argc; i++){
      //rb->memset(buf, 0, sizeof(buf));
      rb->snprintf(buf, sizeof(buf), "%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
      ret = rb->write(fd, buf, rb->strlen(buf));
  }
    //DEBUGF("\n");
    rb->close(fd);
  return 0;
}