com.google.appengine.api.datastore
Interface Transaction

public interface Transaction

Describes a logical unit of work to be performed against the datastore. Operations performed as part of a single Transaction succeed or fail as a unit.

Method Summary

void	commit() Commits the transaction.
java.lang.String	getId()
boolean	isActive()
void	rollback() Rolls back the transaction.

Method Detail

commit

void commit()

Commits the transaction. Whether this call succeeds or fails, all subsequent method invocations on this object will throw IllegalStateException.

Throws:

java.lang.IllegalStateException - If the transaction has already been committed, rolled back, or an attempt to commit or roll back has already failed.

DatastoreFailureException - If a datastore error occurs.

rollback

void rollback()

Rolls back the transaction. Whether this call succeeds or fails, all subsequent method invocations on this object will throw IllegalStateException.

Throws:

java.lang.IllegalStateException - If the transaction has already been committed, rolled back, or an attempt to commit or roll back has already failed.

DatastoreFailureException - If a datastore error occurs.

getId

java.lang.String getId()

Returns:

The globally unique identifier for the Transaction.

isActive

boolean isActive()

Returns:

true if the transaction is active, false otherwise.