class StubConnection

class StubConnection extends Connection {
    
    /**
     * {@inheritdoc}
     */
    protected $statementClass = NULL;
    
    /**
     * {@inheritdoc}
     */
    protected $statementWrapperClass = StatementWrapper::class;
    
    /**
     * Public property so we can test driver loading mechanism.
     *
     * @var string
     * @see driver().
     */
    public $driver = 'stub';
    
    /**
     * Constructs a Connection object.
     *
     * @param \PDO $connection
     *   An object of the PDO class representing a database connection.
     * @param array $connection_options
     *   An array of options for the connection.
     * @param string[]|null $identifier_quotes
     *   The identifier quote characters. Defaults to an empty strings.
     * @param string|null $statement_class
     *   A class to use as a statement class for deprecation testing.
     */
    public function __construct(\PDO $connection, array $connection_options, $identifier_quotes = [
        '',
        '',
    ], $statement_class = NULL) {
        $this->identifierQuotes = $identifier_quotes;
        if ($statement_class) {
            $this->statementClass = $statement_class;
            $this->statementWrapperClass = NULL;
        }
        parent::__construct($connection, $connection_options);
    }
    
    /**
     * {@inheritdoc}
     */
    public static function open(array &$connection_options = []) {
        return new \stdClass();
    }
    
    /**
     * {@inheritdoc}
     */
    public function queryRange($query, $from, $count, array $args = [], array $options = []) {
        return NULL;
    }
    
    /**
     * {@inheritdoc}
     */
    public function queryTemporary($query, array $args = [], array $options = []) {
        return '';
    }
    
    /**
     * {@inheritdoc}
     */
    public function driver() {
        return $this->driver;
    }
    
    /**
     * {@inheritdoc}
     */
    public function databaseType() {
        return 'stub';
    }
    
    /**
     * {@inheritdoc}
     */
    public function createDatabase($database) {
    }
    
    /**
     * {@inheritdoc}
     */
    public function mapConditionOperator($operator) {
        return NULL;
    }
    
    /**
     * {@inheritdoc}
     */
    public function nextId($existing_id = 0) {
        return 0;
    }
    
    /**
     * Helper method to test database classes are not included in backtraces.
     *
     * @return array
     *   The caller stack entry.
     */
    public function testLogCaller() {
        return (new Log())->findCaller();
    }

}