rdflib.store.BerkeleyDB.BerkeleyDB

Package rdflib :: Package store :: Module BerkeleyDB :: Class BerkeleyDB

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Type BerkeleyDB

object --+    
         |    
     Store --+
             |
            BerkeleyDB

A transaction-capable BerkeleyDB implementation The major difference are:

a dbTxn attribute which is the transaction object used for all bsddb databases
All operations (put,delete,get) take the dbTxn instance
The actual directory used for the bsddb persistence is the name of the identifier as a subdirectory of the 'path'

Method Summary
	`__init__(self, configuration, identifier)` identifier: URIRef of the Store.
	`__del__(self)` Redirects python's native garbage collection into Store.close
	`__len__(self, context)` Number of statements in the store.
	`add(self, (subject, predicate, object_), context, quoted)` Add a triple to the store of triples.
	`bind(self, prefix, namespace)`
	`close(self, commit_pending_transaction)` Properly handles transactions explicitely (with parameter) or by default
	`commit(self)` Bsddb tx objects cannot be reused after commit
	`contexts(self, triple)` Generator over all contexts in the graph.
	`destroy(self, configuration)` Destroy the underlying bsddb persistence for this store
	`namespace(self, prefix)`
	`namespaces(self)`
	`open(self, path, create)`
	`prefix(self, namespace)`
	`remove(self, (subject, predicate, object_), context)`
	`rollback(self)` Bsddb tx objects cannot be reused after commit
	`sync(self)`
	`triples(self, (subject, predicate, object_), context)` A generator over all the triples matching
Inherited from Store
	`addN(self, quads)` Adds each item in the list of statements to a specific context.
	`create(self, configuration)`
	`gc(self)` Allows the store to perform any needed garbage collection
	`triples_choices(self, (subject, predicate, object_), context)` A variant of triples that can take a list of terms instead of a single term in any slot.
Inherited from object
	`__delattr__(...)` x.__delattr__('name') <==> del x.name
	`__getattribute__(...)` x.__getattribute__('name') <==> x.name
	`__hash__(x)` x.__hash__() <==> hash(x)
	`__new__(T, S, ...)` T.__new__(S, ...) -> a new object with type S, a subtype of T
	`__reduce__(...)` helper for pickle
	`__reduce_ex__(...)` helper for pickle
	`__repr__(x)` x.__repr__() <==> repr(x)
	`__setattr__(...)` x.__setattr__('name', value) <==> x.name = value
	`__str__(x)` x.__str__() <==> str(x)

Property Summary
	`identifier`
Inherited from Store
	`node_pickler`

Class Variable Summary
`bool`	`context_aware` = `True`
`bool`	`formula_aware` = `True`
`bool`	`transaction_aware` = `True`

Method Details

init(self, configuration=None, identifier=None)
(Constructor)

identifier: URIRef of the Store. Defaults to CWD configuration: string containing infomation open can use to connect to datastore.

Overrides:: rdflib.store.Store.__init__ (inherited documentation)

del(self)
(Destructor)

Redirects python's native garbage collection into Store.close

len(self, context=None)
(Length operator)

Number of statements in the store. This should only account for non-quoted (asserted) statements if the context is not specified, otherwise it should return the number of statements in the formula or context given.

Overrides:: rdflib.store.Store.__len__ (inherited documentation)

add(self, (subject, predicate, object_), context, quoted=False)

Add a triple to the store of triples.

Overrides:: rdflib.store.Store.add

close(self, commit_pending_transaction=False)

Properly handles transactions explicitely (with parameter) or by default

Overrides:: rdflib.store.Store.close

commit(self)

Bsddb tx objects cannot be reused after commit

Overrides:: rdflib.store.Store.commit

contexts(self, triple=None)

Generator over all contexts in the graph. If triple is specified, a generator over all contexts the triple is in.

Overrides:: rdflib.store.Store.contexts (inherited documentation)

destroy(self, configuration)

Destroy the underlying bsddb persistence for this store

Overrides:: rdflib.store.Store.destroy

rollback(self)

Bsddb tx objects cannot be reused after commit

Overrides:: rdflib.store.Store.rollback

triples(self, (subject, predicate, object_), context=None)

A generator over all the triples matching

Overrides:: rdflib.store.Store.triples

Class Variable Details

context_aware

Type:: bool
Value:: True

formula_aware

Type:: bool
Value:: True

transaction_aware

Type:: bool
Value:: True

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