__init__(self, anAdaptor)
(Constructor)

Overrides:

Modeling.AdaptorContext.AdaptorContext.__init__

adaptorChannelDidClose(self, aChannel)

Informs the AdaptorContext that one of its AdaptorChannel has been closed. Never invoke this method yourself, it is automatically called by the AdaptorChannel.

Default behaviour leaves the connection to the database open, even when the AdaptorContext has no opened channels ; setting the environment variable 'MDL_TRANSIENT_DB_CONNECTION' to any true value closes the database connection the AdaptorContext has no opened channels anymore.

You do not need to override this method when designing a concrete AdaptorContext. If you do, however, you must call the superclass implementation, and you must keep in mind that the underlying database connection may have been closed as well.

Parameter 'aChannel' is currently unused.

See also: AbstractDBAPI2AdaptorChannel.closeChannel()

Modeling.AdaptorChannel.closeChannel()

Overrides:

Modeling.AdaptorContext.AdaptorContext.adaptorChannelDidClose

beginTransaction(self)

Starts a new transaction.

Raises GeneralAdaptorException if an transaction has already begun.

See also: Modeling.interfaces.AdaptorContext for details

Overrides:

Modeling.AdaptorContext.AdaptorContext.beginTransaction

commitTransaction(self)

Commits the currently opened transaction.

Raises GeneralAdaptorException if no transaction has begun.

See also: Modeling.interfaces.AdaptorContext for details

Overrides:

Modeling.AdaptorContext.AdaptorContext.commitTransaction

createAdaptorChannel(self)

Returns a brand new instance of the adequate concrete AdaptorChannel.

Implementation hint: say your adaptor's name is 'Dummy', then you'll

probably use the following code:

from DummyAdaptorChannel import DummyAdaptorChannel
db_trace('Creating DummyAdaptorChannel %s'%repr(channel))
channel=DummyAdaptorChannel(self)
self.__addChannel__(channel)
return channel

--> It is very important that you do not forget to append the new

adaptor channel to the list of held channels, using the __addChannel__ method.

Subclasses should override this method without calling the superclass' implementation.

See also: Modeling.interfaces.AdaptorContext for details

Overrides:

Modeling.AdaptorContext.AdaptorContext.createAdaptorChannel

dbAPI_cursorForAdaptorChannel(self)

Returns a 'cursor' for use by an AbstractDBAPI2AdaptorChannel when it is about to open the channel. Never invoke this method, this is automatically invoked by the AbstractDBAPI2AdaptorChannel.

See also: AbstractDBAPI2AdaptorChannel.openChannel()

rollbackTransaction(self)

Rollbacks the currently opened transaction.

Raises GeneralAdaptorException if no transaction has begun.

See also: Modeling.interfaces.AdaptorContext for details

Overrides:

Modeling.AdaptorContext.AdaptorContext.rollbackTransaction

_openConnectionIfNecessary(self)

Internally used to open a connection to the underlying database, if necessary.

Raises GeneralAdaptorException if the connection cannot be opened --in this case the reason why it failed is attached to the exception.