code: public function get($name)
      {
          $queryBuilder = $this->connection->createQueryBuilder();
          $queryBuilder->from($this->table, 'config');
          $queryBuilder->select([
              'config.value',
          ]);
          $queryBuilder->andWhere('config.name = :name');
          $queryBuilder->setParameter(':name', $name);
  
          $configValue = $queryBuilder->execute()->fetchColumn();
  
          if (!$configValue) {
              return null;
          }
  
          return $configValue;
      }
docs: {@inheritdoc}