Runs the Action action in a transaction and returns the function result. If the database is not currently in a transaction, a new transaction is created using BeginTransaction with TransactionMode.Deferred and committed. Otherwise the transaction is created within a savepoint block but not fully committed to the database until the enclosing transaction is committed.

Runs the function f in a transaction and returns the function result. If the database is not currently in a transaction, a new transaction is created using BeginTransaction with TransactionMode.Deferred and committed. Otherwise the transaction is created within a savepoint block but not fully committed to the database until the enclosing transaction is committed.

Runs the Action action in a transaction and returns the function result. If the database is not currently in a transaction, a new transaction is created using the provided TransactionMode and committed. Otherwise the transaction is created within a savepoint block but not fully committed to the database until the enclosing transaction is committed.

Runs the function f in a transaction and returns the function result. If the database is not currently in a transaction, a new transaction is created using the provided TransactionMode and committed. Otherwise the transaction is created within a savepoint block but not fully committed to the database until the enclosing transaction is committed.