mirror of
https://github.com/berkeleydb/libdb.git
synced 2024-11-17 01:26:25 +00:00
185 lines
7.8 KiB
HTML
185 lines
7.8 KiB
HTML
|
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
|
|||
|
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
|||
|
|
<html xmlns="http://www.w3.org/1999/xhtml">
|
|||
|
|
<head>
|
|||
|
|
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
|
|||
|
|
<title>Chapter 12. The DbSequence Handle</title>
|
|||
|
|
<link rel="stylesheet" href="apiReference.css" type="text/css" />
|
|||
|
|
<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
|
|||
|
|
<link rel="start" href="index.html" title="Berkeley DB C++ API Reference" />
|
|||
|
|
<link rel="up" href="index.html" title="Berkeley DB C++ API Reference" />
|
|||
|
|
<link rel="prev" href="txnset_commit_token.html" title="DbTxn::set_commit_token()" />
|
|||
|
|
<link rel="next" href="seqcreate.html" title="DbSequence" />
|
|||
|
|
</head>
|
|||
|
|
<body>
|
|||
|
|
<div xmlns="" class="navheader">
|
|||
|
|
<div class="libver">
|
|||
|
|
<p>Library Version 11.2.5.2</p>
|
|||
|
|
</div>
|
|||
|
|
<table width="100%" summary="Navigation header">
|
|||
|
|
<tr>
|
|||
|
|
<th colspan="3" align="center">Chapter 12.
|
|||
|
|
The DbSequence Handle
|
|||
|
|
</th>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td width="20%" align="left"><a accesskey="p" href="txnset_commit_token.html">Prev</a> </td>
|
|||
|
|
<th width="60%" align="center"> </th>
|
|||
|
|
<td width="20%" align="right"> <a accesskey="n" href="seqcreate.html">Next</a></td>
|
|||
|
|
</tr>
|
|||
|
|
</table>
|
|||
|
|
<hr />
|
|||
|
|
</div>
|
|||
|
|
<div class="chapter" lang="en" xml:lang="en">
|
|||
|
|
<div class="titlepage">
|
|||
|
|
<div>
|
|||
|
|
<div>
|
|||
|
|
<h2 class="title"><a id="seq"></a>Chapter 12.
|
|||
|
|
The DbSequence Handle
|
|||
|
|
</h2>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
<p>
|
|||
|
|
Sequences provide an arbitrary number of persistent objects that return an
|
|||
|
|
increasing or decreasing sequence of integers. Opening a sequence handle associates
|
|||
|
|
it with a record in a database. The handle can maintain a cache of values from the
|
|||
|
|
database so that a database update is not needed as the application allocates a
|
|||
|
|
value.
|
|||
|
|
</p>
|
|||
|
|
<p>
|
|||
|
|
A sequence is stored as a record pair in a database. The database may be of any
|
|||
|
|
type, but must not have been configured to support duplicate data items. The sequence
|
|||
|
|
is referenced by the key used when the sequence is created, therefore the key must
|
|||
|
|
be compatible with the underlying access method. If the database stores fixed-length
|
|||
|
|
records, the record size must be at least 64 bytes long.
|
|||
|
|
</p>
|
|||
|
|
<p>
|
|||
|
|
You create a sequence using the
|
|||
|
|
<a class="xref" href="seqcreate.html" title="DbSequence">DbSequence</a> method.
|
|||
|
|
</p>
|
|||
|
|
<p>
|
|||
|
|
For more information on sequences, see the
|
|||
|
|
<em class="citetitle">Berkeley DB Programmer's Reference Guide</em> guide.
|
|||
|
|
</p>
|
|||
|
|
<div class="sect1" lang="en" xml:lang="en">
|
|||
|
|
<div class="titlepage">
|
|||
|
|
<div>
|
|||
|
|
<div>
|
|||
|
|
<h2 class="title" style="clear: both"><a id="seqlist"></a>Sequences and Related Methods</h2>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
<div class="navtable">
|
|||
|
|
<table border="1" width="80%">
|
|||
|
|
<thead>
|
|||
|
|
<tr>
|
|||
|
|
<th>Sequences and Related Methods</th>
|
|||
|
|
<th>Description</th>
|
|||
|
|
</tr>
|
|||
|
|
</thead>
|
|||
|
|
<tbody>
|
|||
|
|
<tr>
|
|||
|
|
<td>
|
|||
|
|
<a class="xref" href="seqcreate.html" title="DbSequence">DbSequence</a>
|
|||
|
|
</td>
|
|||
|
|
<td>Create a sequence handle</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td>
|
|||
|
|
<a class="xref" href="seqclose.html" title="DbSequence::close()">DbSequence::close()</a>
|
|||
|
|
</td>
|
|||
|
|
<td>Close a sequence</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td>
|
|||
|
|
<a class="xref" href="seqget.html" title="DbSequence::get()">DbSequence::get()</a>
|
|||
|
|
</td>
|
|||
|
|
<td>Get the next sequence element(s)</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td>
|
|||
|
|
<a class="xref" href="seqget_dbp.html" title="DbSequence::get_dbp()">DbSequence::get_dbp()</a>
|
|||
|
|
</td>
|
|||
|
|
<td>Return a handle for the underlying sequence database</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td>
|
|||
|
|
<a class="xref" href="seqget_key.html" title="DbSequence::get_key()">DbSequence::get_key()</a>
|
|||
|
|
</td>
|
|||
|
|
<td>Return the key for a sequence</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td>
|
|||
|
|
<a class="xref" href="seqinitial_value.html" title="DbSequence::initial_value()">DbSequence::initial_value()</a>
|
|||
|
|
</td>
|
|||
|
|
<td>Set the initial value of a sequence</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td>
|
|||
|
|
<a class="xref" href="seqopen.html" title="DbSequence::open()">DbSequence::open()</a>
|
|||
|
|
</td>
|
|||
|
|
<td>Open a sequence</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td>
|
|||
|
|
<a class="xref" href="seqremove.html" title="DbSequence::remove()">DbSequence::remove()</a>
|
|||
|
|
</td>
|
|||
|
|
<td>Remove a sequence</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td>
|
|||
|
|
<a class="xref" href="seqstat.html" title="DbSequence::stat()">DbSequence::stat()</a>
|
|||
|
|
</td>
|
|||
|
|
<td>Return sequence statistics</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td>
|
|||
|
|
<a class="xref" href="seqstat_print.html" title="DbSequence::stat_print()">DbSequence::stat_print()</a>
|
|||
|
|
</td>
|
|||
|
|
<td>Print sequence statistics</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td colspan="2">
|
|||
|
|
<span class="bold">
|
|||
|
|
<strong>Sequences Configuration</strong>
|
|||
|
|
</span>
|
|||
|
|
</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td><a class="xref" href="seqset_cachesize.html" title="DbSequence::set_cachesize()">DbSequence::set_cachesize()</a>, <a class="xref" href="seqget_cachesize.html" title="DbSequence::get_cachesize()">DbSequence::get_cachesize()</a></td>
|
|||
|
|
<td>Set/get the cache size of a sequence</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td><a class="xref" href="seqset_flags.html" title="DbSequence::set_flags()">DbSequence::set_flags()</a>, <a class="xref" href="seqget_flags.html" title="DbSequence::get_flags()">DbSequence::get_flags()</a></td>
|
|||
|
|
<td>Set/get the flags for a sequence</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td><a class="xref" href="seqset_range.html" title="DbSequence::set_range()">DbSequence::set_range()</a>, <a class="xref" href="seqget_range.html" title="DbSequence::get_range()">DbSequence::get_range()</a></td>
|
|||
|
|
<td>Set/get the range for a sequence</td>
|
|||
|
|
</tr>
|
|||
|
|
</tbody>
|
|||
|
|
</table>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
<div class="navfooter">
|
|||
|
|
<hr />
|
|||
|
|
<table width="100%" summary="Navigation footer">
|
|||
|
|
<tr>
|
|||
|
|
<td width="40%" align="left"><a accesskey="p" href="txnset_commit_token.html">Prev</a> </td>
|
|||
|
|
<td width="20%" align="center"> </td>
|
|||
|
|
<td width="40%" align="right"> <a accesskey="n" href="seqcreate.html">Next</a></td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td width="40%" align="left" valign="top">DbTxn::set_commit_token() </td>
|
|||
|
|
<td width="20%" align="center">
|
|||
|
|
<a accesskey="h" href="index.html">Home</a>
|
|||
|
|
</td>
|
|||
|
|
<td width="40%" align="right" valign="top"> DbSequence</td>
|
|||
|
|
</tr>
|
|||
|
|
</table>
|
|||
|
|
</div>
|
|||
|
|
</body>
|
|||
|
|
</html>
|