Movatterモバイル変換

13.10.1 Database Objects

The database objects returned byopen() provide the methods common to all the DBM-style databases and mapping objects. The followingmethods are available in addition to the standard methods.

first( ): It's possible to loop over every key/value pair in the database using this method and thenext() method. The traversal is ordered by the databases internal hash values, and won't be sorted by the key values. This method returns the starting key.

last( ): Return the last key/value pair in a database traversal. This may be used to begin a reverse-order traversal; seeprevious().

next( )

Returns the key next key/value pair in a database traversal. The following code prints every key in the databasedb, without having to create a list in memory that contains them all:

print db.first()for i in xrange(1, len(db)):    print db.next()

previous( ): Returns the previous key/value pair in a forward-traversal of the database. In conjunction withlast(), this may be used to implement a reverse-order traversal.

sync( ): This method forces any unwritten data to be written to the disk.

Release 2.5.2, documentation updated on 21st February, 2008.

SeeAbout this document... for information on suggesting changes.

[8]ページ先頭