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<H1><A NAME="SECTION0091300000000000000000">
7.13 <tt class="module">bsddb</tt> --
         Interface to Berkeley DB library</A>
</H1>

<P>
<A NAME="module-bsddb"></A>  
<p class="availability">Availability: <span
 class="platform">Unix, Windows</span>.</p>

<P>
The <tt class="module">bsddb</tt> module provides an interface to the Berkeley DB
library.  Users can create hash, btree or record based library files
using the appropriate open call. Bsddb objects behave generally like
dictionaries.  Keys and values must be strings, however, so to use
other objects as keys or to store other kinds of objects the user must
serialize them somehow, typically using marshal.dumps or pickle.dumps.

<P>
Starting with Python 2.3 the <tt class="module">bsddb</tt> module requires the
Berkeley DB library version 3.2 or later (it is known to work with 3.2
through 4.3 at the time of this writing).

<P>
<div class="seealso">
  <p class="heading">See Also:</p>

  <dl compact="compact" class="seeurl">
    <dt><a href="http://pybsddb.sourceforge.net/"
        class="url">http://pybsddb.sourceforge.net/</a></dt>
    <dd>Website with documentation
  for the new python Berkeley DB interface that closely mirrors the 
  sleepycat object oriented interface provided in Berkeley DB 3 and 4.</dd>
  </dl>
  <dl compact="compact" class="seeurl">
    <dt><a href="http://www.sleepycat.com/"
        class="url">http://www.sleepycat.com/</a></dt>
    <dd>Sleepycat Software produces the
  modern Berkeley DB library.</dd>
  </dl>
</div>

<P>
The following is a description of the legacy <tt class="module">bsddb</tt> interface
compatible with the old python bsddb module.  For details about the more
modern Db and DbEnv object oriented interface see the above mentioned
pybsddb URL.

<P>
The <tt class="module">bsddb</tt> module defines the following functions that create
objects that access the appropriate type of Berkeley DB file.  The
first two arguments of each function are the same.  For ease of
portability, only the first two arguments should be used in most
instances.

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-2797' xml:id='l2h-2797' class="function">hashopen</tt></b>(</nobr></td>
  <td><var>filename</var><big>[</big><var>, flag</var><big>[</big><var>,
                           mode</var><big>[</big><var>, bsize</var><big>[</big><var>,
                           ffactor</var><big>[</big><var>, nelem</var><big>[</big><var>,
                           cachesize</var><big>[</big><var>, hash</var><big>[</big><var>,
                           lorder</var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var>)</td></tr></table></dt>
<dd>
Open the hash format file named <var>filename</var>.  Files never intended
to be preserved on disk may be created by passing <code>None</code> as the 
<var>filename</var>.  The optional
<var>flag</var> identifies the mode used to open the file.  It may be
"<tt class="character">r</tt>" (read only), "<tt class="character">w</tt>" (read-write) ,
"<tt class="character">c</tt>" (read-write - create if necessary; the default) or
"<tt class="character">n</tt>" (read-write - truncate to zero length).  The other
arguments are rarely used and are just passed to the low-level
<tt class="cfunction">dbopen()</tt> function.  Consult the Berkeley DB documentation
for their use and interpretation.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-2798' xml:id='l2h-2798' class="function">btopen</tt></b>(</nobr></td>
  <td><var>filename</var><big>[</big><var>, flag</var><big>[</big><var>,
mode</var><big>[</big><var>, btflags</var><big>[</big><var>, cachesize</var><big>[</big><var>, maxkeypage</var><big>[</big><var>,
minkeypage</var><big>[</big><var>, pgsize</var><big>[</big><var>, lorder</var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var>)</td></tr></table></dt>
<dd>

<P>
Open the btree format file named <var>filename</var>.  Files never intended 
to be preserved on disk may be created by passing <code>None</code> as the 
<var>filename</var>.  The optional
<var>flag</var> identifies the mode used to open the file.  It may be
"<tt class="character">r</tt>" (read only), "<tt class="character">w</tt>" (read-write),
"<tt class="character">c</tt>" (read-write - create if necessary; the default) or
"<tt class="character">n</tt>" (read-write - truncate to zero length).  The other
arguments are rarely used and are just passed to the low-level dbopen
function.  Consult the Berkeley DB documentation for their use and
interpretation.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-2799' xml:id='l2h-2799' class="function">rnopen</tt></b>(</nobr></td>
  <td><var>filename</var><big>[</big><var>, flag</var><big>[</big><var>, mode</var><big>[</big><var>,
rnflags</var><big>[</big><var>, cachesize</var><big>[</big><var>, pgsize</var><big>[</big><var>, lorder</var><big>[</big><var>,
reclen</var><big>[</big><var>, bval</var><big>[</big><var>, bfname</var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var>)</td></tr></table></dt>
<dd>

<P>
Open a DB record format file named <var>filename</var>.  Files never intended 
to be preserved on disk may be created by passing <code>None</code> as the 
<var>filename</var>.  The optional
<var>flag</var> identifies the mode used to open the file.  It may be
"<tt class="character">r</tt>" (read only), "<tt class="character">w</tt>" (read-write),
"<tt class="character">c</tt>" (read-write - create if necessary; the default) or
"<tt class="character">n</tt>" (read-write - truncate to zero length).  The other
arguments are rarely used and are just passed to the low-level dbopen
function.  Consult the Berkeley DB documentation for their use and
interpretation.
</dl>

<P>
<div class="note"><b class="label">Note:</b>
Beginning in 2.3 some Unix versions of Python may have a <tt class="module">bsddb185</tt>
module.  This is present <em>only</em> to allow backwards compatibility with
systems which ship with the old Berkeley DB 1.85 database library.  The
<tt class="module">bsddb185</tt> module should never be used directly in new code.
</div>

<P>
<div class="seealso">
  <p class="heading">See Also:</p>

  <dl compact="compact" class="seemodule">
    <dt>Module <b><tt class="module"><a href="module-dbhash.html">dbhash</a></tt>:</b>
    <dd>DBM-style interface to the <tt class="module">bsddb</tt>.
  </dl>
</div>

<P>

<p><br /></p><hr class='online-navigation' />
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<!--Table of Child-Links-->
<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></a>

<UL CLASS="ChildLinks">
<LI><A href="bsddb-objects.html">7.13.1 Hash, BTree and Record Objects</a>
</ul>
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<span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span>
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	54
	55	<H1><A NAME="SECTION0091300000000000000000">
	56	7.13 <tt class="module">bsddb</tt> --
	57	Interface to Berkeley DB library</A>
	58	</H1>
	59
	60	<P>
	61	<A NAME="module-bsddb"></A>
	62	<p class="availability">Availability: <span
	63	class="platform">Unix, Windows</span>.</p>
	64
65	<P>
66	The <tt class="module">bsddb</tt> module provides an interface to the Berkeley DB
67	library. Users can create hash, btree or record based library files
68	using the appropriate open call. Bsddb objects behave generally like
69	dictionaries. Keys and values must be strings, however, so to use
70	other objects as keys or to store other kinds of objects the user must
71	serialize them somehow, typically using marshal.dumps or pickle.dumps.
72
73	<P>
74	Starting with Python 2.3 the <tt class="module">bsddb</tt> module requires the
75	Berkeley DB library version 3.2 or later (it is known to work with 3.2
76	through 4.3 at the time of this writing).
77
78	<P>
79	<div class="seealso">
80	<p class="heading">See Also:</p>
81
82	<dl compact="compact" class="seeurl">
83	<dt><a href="http://pybsddb.sourceforge.net/"
84	class="url">http://pybsddb.sourceforge.net/</a></dt>
85	<dd>Website with documentation
86	for the new python Berkeley DB interface that closely mirrors the
87	sleepycat object oriented interface provided in Berkeley DB 3 and 4.</dd>
88	</dl>
89	<dl compact="compact" class="seeurl">
90	<dt><a href="http://www.sleepycat.com/"
91	class="url">http://www.sleepycat.com/</a></dt>
92	<dd>Sleepycat Software produces the
93	modern Berkeley DB library.</dd>
94	</dl>
95	</div>
96
97	<P>
98	The following is a description of the legacy <tt class="module">bsddb</tt> interface
99	compatible with the old python bsddb module. For details about the more
100	modern Db and DbEnv object oriented interface see the above mentioned
101	pybsddb URL.
102
103	<P>
104	The <tt class="module">bsddb</tt> module defines the following functions that create
105	objects that access the appropriate type of Berkeley DB file. The
106	first two arguments of each function are the same. For ease of
107	portability, only the first two arguments should be used in most
108	instances.
109
110	<P>
111	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
112	<td><nobr><b><tt id='l2h-2797' xml:id='l2h-2797' class="function">hashopen</tt></b>(</nobr></td>
113	<td><var>filename</var><big>[</big><var>, flag</var><big>[</big><var>,
114	mode</var><big>[</big><var>, bsize</var><big>[</big><var>,
115	ffactor</var><big>[</big><var>, nelem</var><big>[</big><var>,
116	cachesize</var><big>[</big><var>, hash</var><big>[</big><var>,
117	lorder</var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var>)</td></tr></table></dt>
118	<dd>
119	Open the hash format file named <var>filename</var>. Files never intended
120	to be preserved on disk may be created by passing <code>None</code> as the
121	<var>filename</var>. The optional
122	<var>flag</var> identifies the mode used to open the file. It may be
123	"<tt class="character">r</tt>" (read only), "<tt class="character">w</tt>" (read-write) ,
124	"<tt class="character">c</tt>" (read-write - create if necessary; the default) or
125	"<tt class="character">n</tt>" (read-write - truncate to zero length). The other
126	arguments are rarely used and are just passed to the low-level
127	<tt class="cfunction">dbopen()</tt> function. Consult the Berkeley DB documentation
128	for their use and interpretation.
129	</dl>
130
131	<P>
132	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
133	<td><nobr><b><tt id='l2h-2798' xml:id='l2h-2798' class="function">btopen</tt></b>(</nobr></td>
134	<td><var>filename</var><big>[</big><var>, flag</var><big>[</big><var>,
135	mode</var><big>[</big><var>, btflags</var><big>[</big><var>, cachesize</var><big>[</big><var>, maxkeypage</var><big>[</big><var>,
136	minkeypage</var><big>[</big><var>, pgsize</var><big>[</big><var>, lorder</var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var>)</td></tr></table></dt>
137	<dd>
138
139	<P>
140	Open the btree format file named <var>filename</var>. Files never intended
141	to be preserved on disk may be created by passing <code>None</code> as the
142	<var>filename</var>. The optional
143	<var>flag</var> identifies the mode used to open the file. It may be
144	"<tt class="character">r</tt>" (read only), "<tt class="character">w</tt>" (read-write),
145	"<tt class="character">c</tt>" (read-write - create if necessary; the default) or
146	"<tt class="character">n</tt>" (read-write - truncate to zero length). The other
147	arguments are rarely used and are just passed to the low-level dbopen
148	function. Consult the Berkeley DB documentation for their use and
149	interpretation.
150	</dl>
151
152	<P>
153	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
154	<td><nobr><b><tt id='l2h-2799' xml:id='l2h-2799' class="function">rnopen</tt></b>(</nobr></td>
155	<td><var>filename</var><big>[</big><var>, flag</var><big>[</big><var>, mode</var><big>[</big><var>,
156	rnflags</var><big>[</big><var>, cachesize</var><big>[</big><var>, pgsize</var><big>[</big><var>, lorder</var><big>[</big><var>,
157	reclen</var><big>[</big><var>, bval</var><big>[</big><var>, bfname</var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var>)</td></tr></table></dt>
158	<dd>
159
160	<P>
161	Open a DB record format file named <var>filename</var>. Files never intended
162	to be preserved on disk may be created by passing <code>None</code> as the
163	<var>filename</var>. The optional
164	<var>flag</var> identifies the mode used to open the file. It may be
165	"<tt class="character">r</tt>" (read only), "<tt class="character">w</tt>" (read-write),
166	"<tt class="character">c</tt>" (read-write - create if necessary; the default) or
167	"<tt class="character">n</tt>" (read-write - truncate to zero length). The other
168	arguments are rarely used and are just passed to the low-level dbopen
169	function. Consult the Berkeley DB documentation for their use and
170	interpretation.
171	</dl>
172
173	<P>
174	<div class="note"><b class="label">Note:</b>
175	Beginning in 2.3 some Unix versions of Python may have a <tt class="module">bsddb185</tt>
176	module. This is present <em>only</em> to allow backwards compatibility with
177	systems which ship with the old Berkeley DB 1.85 database library. The
178	<tt class="module">bsddb185</tt> module should never be used directly in new code.
179	</div>
180
181	<P>
182	<div class="seealso">
183	<p class="heading">See Also:</p>
184
185	<dl compact="compact" class="seemodule">
186	<dt>Module <b><tt class="module"><a href="module-dbhash.html">dbhash</a></tt>:</b>
187	<dd>DBM-style interface to the <tt class="module">bsddb</tt>.
188	</dl>
189	</div>
190
191	<P>
192
193	<p><br /></p><hr class='online-navigation' />
194	<div class='online-navigation'>
195	<!--Table of Child-Links-->
196	<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></a>
197
198	<UL CLASS="ChildLinks">
199	<LI><A href="bsddb-objects.html">7.13.1 Hash, BTree and Record Objects</a>
200	</ul>
201	<!--End of Table of Child-Links-->
202	</div>
203
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