Class Transaction

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Defines a group of database commits that define a single logical operation.

Instance Methods

__init__(self, msg, db, batch=False, no_magic=False)
Creates a new transaction.

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get_description(self)
Returns the text string that describes the logical operation performed by the Transaction.

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set_description(self, msg)
Sets the text string that describes the logical operation performed by the Transaction.

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add(self, obj_type, handle, old_data, new_data)
Adds a commit operation to the Transaction.

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get_recnos(self)
Returns a list of record numbers associated with the transaction.

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get_record(self, recno)
Returns a tuple representing the PrimaryObject type, database handle for the PrimaryObject, and a tuple representing the data created by the object's serialize method.

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__len__(self)
Returns the number of commits associated with the Transaction.

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Method Details

init(self, msg, db, batch=False, no_magic=False)
(Constructor)

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Creates a new transaction. A Transaction instance should not be created directly, but by the GrampsDbBase class or classes derived from GrampsDbBase. The db parameter is a list-like interface that stores the commit data. This could be a simple list, or a RECNO-style database object.

The batch parameter is set to True for large transactions. For such transactions, the list of changes is not maintained, and no undo is possible.

The no_magic parameter is ignored for non-batch transactions, and is also of no importance for DB backends other than BSD DB. For the BSDDB, when this paramter is set to True, some secondary indices will be removed at the beginning and then rebuilt at the end of such transaction (only if it is batch).

add(self, obj_type, handle, old_data, new_data)

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Adds a commit operation to the Transaction. The obj_type is a constant that indicates what type of PrimaryObject is being added. The handle is the object's database handle, and the data is the tuple returned by the object's serialize method.

get_recnos(self)

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Returns a list of record numbers associated with the transaction. While the list is an arbitrary index of integers, it can be used to indicate record numbers for a database.

Class Transaction

__init__(self, msg, db, batch=False, no_magic=False) (Constructor)

add(self, obj_type, handle, old_data, new_data)

get_recnos(self)

init(self, msg, db, batch=False, no_magic=False)
(Constructor)