transact<T> abstract method
Begin a transaction / save-point and call fn
before committing the
transaction.
If fn
throws an Exception the transaction shall be rolled back and
TransactionAbortedException thrown with the Exception as reason
.
If fn
throw an Error the transaction shall be rolled back and the
Error will be propagated to the caller.
Any calls on the tx
provided to fn
shall throw StateError after the
transaction has been committed or rolled back.
Any call to script, query, execute or transact while a transaction is ongoing shall throw StateError, until the transaction has been committed or rolled back.
Implementation
@override
Future<T> transact<T>(Future<T> Function(DatabaseTransaction tx) fn);