public function getAllSchemas()
    {
        $sql = "SELECT schema_name
                FROM information_schema.schemata
                WHERE schema_name <> 'information_schema' AND schema_name !~ '^pg_'";
        $items = $this->fetchAll($sql);
        $schemaNames = [];
        foreach ($items as $item) {
            $schemaNames[] = $item['schema_name'];
        }

        return $schemaNames;
    }