/**
* @param QueryInterface $query
*
* @return Result|null
* @throws Exception
*/
public function process(QueryInterface $query)
{
if (!$query instanceof ShowQuery || $query->getObject() !== ShowQuery::EXPRESSION_COLLATION) {
return null;
}
return $this->getResultFromData(self::$data, self::$fields);
}
/**
* @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
*
* @return Result|null
* @throws Exception
*/
public function process(QueryInterface $query)
{
if (!$query instanceof ShowQuery || $query->getObject() !== ShowQuery::EXPRESSION_DATABASES) {
return null;
}
$command = new GetKeyspaces();
/* @var $vtCtldResult GetKeyspacesResult */
$vtCtldResult = $this->client->executeCommand($command);
return new Databases($vtCtldResult);
}
/**
* @param QueryInterface $query
*
* @return Result|null
* @throws Exception
*/
public function process(QueryInterface $query)
{
if (!$query instanceof ShowQuery || $query->getObject() !== ShowQuery::EXPRESSION_TABLES) {
return null;
}
$tablet = $this->tablet->getTablet();
$command = new GetSchema($tablet->getAlias());
/* @var $vtCtldResult GetSchemaResult */
$vtCtldResult = $this->client->executeCommand($command);
return new Tables($vtCtldResult);
}
/**
* @param QueryInterface $query
*
* @return Result|null
* @throws Exception
*/
public function process(QueryInterface $query)
{
if (!$query instanceof ShowQuery || $query->getObject() !== ShowQuery::EXPRESSION_CREATE_DATABASE) {
return null;
}
$database = $query->getCreateObjectExpression(ShowQuery::EXPRESSION_CREATE_DATABASE);
$newData = [];
$newData[] = array_map(function ($row) use($database) {
return str_replace('{DB}', $database, $row);
}, self::$data);
return $this->getResultFromData($newData, self::$fields);
}
/**
* @param QueryInterface $query
*
* @return Result|null
* @throws Exception
*/
public function process(QueryInterface $query)
{
if (!$query instanceof ShowQuery || $query->getObject() !== ShowQuery::EXPRESSION_INDEX) {
return null;
}
$fromExpr = $query->getFromExpression();
if (!$fromExpr) {
throw new Exception('From expression missing.');
}
$tablet = $this->tablet->getTablet();
$schemaCmd = new GetSchema($tablet->getAlias());
/* @var $result GetSchemaResult */
$result = $this->client->executeCommand($schemaCmd);
return new IndexFrom($result, $fromExpr);
}
/**
* @param QueryInterface $query
*
* @return Result|null
* @throws Exception
*/
public function process(QueryInterface $query)
{
if (!$query instanceof ShowQuery || $query->getObject() !== ShowQuery::EXPRESSION_CREATE_TABLE) {
return null;
}
$table = $query->getCreateObjectExpression(ShowQuery::EXPRESSION_CREATE_TABLE);
if (!$table) {
throw new Exception('Table missing.');
}
$tablet = $this->tablet->getTablet();
$schemaCmd = new GetSchema($tablet->getAlias());
/* @var $result GetSchemaResult */
$result = $this->client->executeCommand($schemaCmd);
return new CreateTable($result, $table);
}
