public function getGenerators()
{
$res = $this->query("\n\t\t\tSELECT TRIM(RDB\$GENERATOR_NAME)\n\t\t\tFROM RDB\$GENERATORS\n\t\t\tWHERE RDB\$SYSTEM_FLAG = 0;");
$generators = [];
while ($row = $res->fetch(FALSE)) {
$generators[] = $row[0];
}
return $generators;
}