diff options
Diffstat (limited to 'Doc/lib')
-rw-r--r-- | Doc/lib/libbsddb.tex | 19 | ||||
-rw-r--r-- | Doc/lib/libdbhash.tex | 14 |
2 files changed, 24 insertions, 9 deletions
diff --git a/Doc/lib/libbsddb.tex b/Doc/lib/libbsddb.tex index 7fb8f76e01..719783b63c 100644 --- a/Doc/lib/libbsddb.tex +++ b/Doc/lib/libbsddb.tex @@ -100,8 +100,9 @@ systems which ship with the old Berkeley DB 1.85 database library. The \subsection{Hash, BTree and Record Objects \label{bsddb-objects}} -Once instantiated, hash, btree and record objects support the following -methods: +Once instantiated, hash, btree and record objects support +the same methods as dictionaries. In addition, they support +the following methods: \begin{methoddesc}{close}{} Close the underlying file. The object can no longer be accessed. Since @@ -177,6 +178,20 @@ Example: ('2', '4') >>> db.previous() ('1', '1') +>>> for k, v in db.iteritems(): +... print k, v +0 0 +1 1 +2 4 +3 9 +4 16 +5 25 +6 36 +7 49 +8 64 +9 81 +>>> 8 in db +True >>> db.sync() 0 \end{verbatim} diff --git a/Doc/lib/libdbhash.tex b/Doc/lib/libdbhash.tex index 00a6d080bf..ecaa6c93ab 100644 --- a/Doc/lib/libdbhash.tex +++ b/Doc/lib/libdbhash.tex @@ -51,23 +51,23 @@ This module provides an exception and a function: \subsection{Database Objects \label{dbhash-objects}} The database objects returned by \function{open()} provide the methods -common to all the DBM-style databases. The following methods are -available in addition to the standard methods. +common to all the DBM-style databases and mapping objects. The following +methods are available in addition to the standard methods. \begin{methoddesc}[dbhash]{first}{} - It's possible to loop over every key in the database using this method - and the \method{next()} method. The traversal is ordered by + It's possible to loop over every key/value pair in the database using + this method and the \method{next()} 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. \end{methoddesc} \begin{methoddesc}[dbhash]{last}{} - Return the last key in a database traversal. This may be used to + Return the last key/value pair in a database traversal. This may be used to begin a reverse-order traversal; see \method{previous()}. \end{methoddesc} \begin{methoddesc}[dbhash]{next}{} - Returns the key next key in a database traversal. The + Returns the key next key/value pair in a database traversal. The following code prints every key in the database \code{db}, without having to create a list in memory that contains them all: @@ -79,7 +79,7 @@ for i in xrange(1, len(d)): \end{methoddesc} \begin{methoddesc}[dbhash]{previous}{} - Returns the previous key in a forward-traversal of the database. + Returns the previous key/value pair in a forward-traversal of the database. In conjunction with \method{last()}, this may be used to implement a reverse-order traversal. \end{methoddesc} |