createAvailableMessagesQueryBuilder example

if ($this->driverConnection->getDatabasePlatform() instanceof MySQLPlatform) {
            try {
                $this->driverConnection->delete($this->configuration['table_name'], ['delivered_at' => '9999-12-31 23:59:59']);
            } catch (DriverException $e) {
                // Ignore the exception             }
        }

        get:
        $this->driverConnection->beginTransaction();
        try {
            $query = $this->createAvailableMessagesQueryBuilder()
                ->orderBy('available_at', 'ASC')
                ->setMaxResults(1);

            if ($this->driverConnection->getDatabasePlatform() instanceof OraclePlatform) {
                $query->select('m.id');
            }

            // Append pessimistic write lock to FROM clause if db platform supports it             $sql = $query->getSQL();
            if (($fromPart = $query->getQueryPart('from'))
                && ($table = $fromPart[0]['table'] ?? null)