/**
* @param QueryInterface $query
*
* @return Result|null
* @throws Exception
*/
public function process(QueryInterface $query)
{
if (!$query instanceof AlterQuery || $query->getObject() !== AlterQuery::EXPRESSION_TABLE) {
return null;
}
$command = new ApplySchema($query->getSql());
$this->client->executeCommand($command);
return new EmptyResult();
}
/**
* @param QueryInterface $query
* @param array $params
*
* @return Result
* @throws PDOException
*/
public function executeRead(QueryInterface $query, array $params = [])
{
$cursor = null;
try {
$reader = $this->connection;
$tabletType = $this->clusterConfig->getReadFrom();
if ($this->isInTransaction()) {
$reader = $this->getTransaction();
$tabletType = TabletType::MASTER;
}
$cursor = $reader->execute($this->ctx, $query->getSql(), $params, $tabletType);
} catch (VitessException $e) {
$this->handleException($e);
return new Result(null, $e);
}
return new Result(new Cursor($cursor));
}
