# File activerecord/lib/active_record/connection_adapters/abstract/transaction.rb, line 348
def commit
  connection.commit_db_transaction if materialized?
  @state.full_commit!
end

# File activerecord/lib/active_record/connection_adapters/abstract/transaction.rb, line 322
def materialize!
  if isolation_level
    connection.begin_isolated_db_transaction(isolation_level)
  else
    connection.begin_db_transaction
  end

  super
end

# File activerecord/lib/active_record/connection_adapters/abstract/transaction.rb, line 332
def restart
  return unless materialized?

  if connection.supports_restart_db_transaction?
    connection.restart_db_transaction
  else
    connection.rollback_db_transaction
    materialize!
  end
end

# File activerecord/lib/active_record/connection_adapters/abstract/transaction.rb, line 343
def rollback
  connection.rollback_db_transaction if materialized?
  @state.full_rollback!
end