class StubConnection

class StubConnection extends Connection {
  
  /**
   * {@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.
   */
  public function __construct(\PDO $connection, array $connection_options, $identifier_quotes = [
    '',
    '',
  ]) {
    $this->identifierQuotes = $identifier_quotes;
    parent::__construct($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 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) {
    @trigger_error('Drupal\\Core\\Database\\Connection::nextId() is deprecated in drupal:10.2.0 and is removed from drupal:11.0.0. Modules should use instead the keyvalue storage for the last used id. See https://www.drupal.org/node/3349345', E_USER_DEPRECATED);
    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();
  }
  
  /**
   * {@inheritdoc}
   */
  public function exceptionHandler() {
    return new ExceptionHandler();
  }
  
  /**
   * {@inheritdoc}
   */
  public function select($table, $alias = NULL, array $options = []) {
    return new Select($this, $table, $alias, $options);
  }
  
  /**
   * {@inheritdoc}
   */
  public function insert($table, array $options = []) {
    return new Insert($this, $table, $options);
  }
  
  /**
   * {@inheritdoc}
   */
  public function merge($table, array $options = []) {
    return new Merge($this, $table, $options);
  }
  
  /**
   * {@inheritdoc}
   */
  public function upsert($table, array $options = []) {
    return new StubUpsert($this, $table, $options);
  }
  
  /**
   * {@inheritdoc}
   */
  public function update($table, array $options = []) {
    return new Update($this, $table, $options);
  }
  
  /**
   * {@inheritdoc}
   */
  public function delete($table, array $options = []) {
    return new Delete($this, $table, $options);
  }
  
  /**
   * {@inheritdoc}
   */
  public function truncate($table, array $options = []) {
    return new Truncate($this, $table, $options);
  }
  
  /**
   * {@inheritdoc}
   */
  public function schema() {
    if (empty($this->schema)) {
      $this->schema = new Schema();
    }
    return $this->schema;
  }
  
  /**
   * {@inheritdoc}
   */
  public function condition($conjunction) {
    return new StubCondition($conjunction);
  }
  
  /**
   * {@inheritdoc}
   */
  public function startTransaction($name = '') {
    return new Transaction($this, $name);
  }

}