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## org.springframework.transaction.support
Interface TransactionCallback<T>

All Known Implementing Classes:
  TransactionCallbackWithoutResult

    public interface TransactionCallback<T>

Callback interface for transactional code. Used with `TransactionTemplate`'s `execute` method, often as anonymous class within a method implementation.

Typically used to assemble various calls to transaction-unaware data access services into a higher-level service method with transaction demarcation. As an alternative, consider the use of declarative transaction demarcation (e.g. through Spring's `Transactional` annotation).

Since:
  17.03.2003
Author:
  Juergen Hoeller
See Also:
  `TransactionTemplate`, `CallbackPreferringPlatformTransactionManager`

Method Summary
`T` | `doInTransaction(TransactionStatus status)` Gets called by `TransactionTemplate.execute(org.springframework.transaction.support.TransactionCallback)` within a transactional context.

Method Detail

### doInTransaction

    T doInTransaction(TransactionStatus status)

  Gets called by `TransactionTemplate.execute(org.springframework.transaction.support.TransactionCallback)` within a transactional context. Does not need to care about transactions itself, although it can retrieve and influence the status of the current transaction via the given status object, e.g. setting rollback-only.

  Allows for returning a result object created within the transaction, i.e. a domain object or a collection of domain objects. A RuntimeException thrown by the callback is treated as application exception that enforces a rollback. Any such exception will be propagated to the caller of the template, unless there is a problem rolling back, in which case a TransactionException will be thrown.

  Parameters:
    `status` - associated transaction status
  Returns:
    a result object, or `null`
  See Also:
    `TransactionTemplate.execute(org.springframework.transaction.support.TransactionCallback)`, `CallbackPreferringPlatformTransactionManager.execute(org.springframework.transaction.TransactionDefinition, org.springframework.transaction.support.TransactionCallback)`

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