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HTML
184 lines
8 KiB
HTML
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>Chapter 11. The DB_SEQUENCE Handle</title>
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<link rel="stylesheet" href="apiReference.css" type="text/css" />
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="start" href="index.html" title="Berkeley DB C API Reference" />
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<link rel="up" href="index.html" title="Berkeley DB C API Reference" />
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<link rel="prev" href="txnset_commit_token.html" title="DB_TXN->set_commit_token()" />
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<link rel="next" href="seqcreate.html" title="db_sequence_create" />
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</head>
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<body>
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<div xmlns="" class="navheader">
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<div class="libver">
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<p>Library Version 11.2.5.3</p>
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">Chapter 11.
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The DB_SEQUENCE Handle
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</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="txnset_commit_token.html">Prev</a> </td>
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<th width="60%" align="center"> </th>
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<td width="20%" align="right"> <a accesskey="n" href="seqcreate.html">Next</a></td>
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</tr>
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</table>
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<hr />
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</div>
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<div class="chapter" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title"><a id="seq"></a>Chapter 11.
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The DB_SEQUENCE Handle
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</h2>
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</div>
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</div>
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</div>
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<p>
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Sequences provide an arbitrary number of persistent objects that return an
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increasing or decreasing sequence of integers. Opening a sequence handle associates
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it with a record in a database. The handle can maintain a cache of values from the
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database so that a database update is not needed as the application allocates a
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value.
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</p>
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<p>
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A sequence is stored as a record pair in a database. The database may be of any
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type, but must not have been configured to support duplicate data items. The sequence
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is referenced by the key used when the sequence is created, therefore the key must
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be compatible with the underlying access method. If the database stores fixed-length
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records, the record size must be at least 64 bytes long.
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</p>
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<p>
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You create a sequence using the
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<a class="xref" href="seqcreate.html" title="db_sequence_create">db_sequence_create</a> method.
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</p>
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<p>
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For more information on sequences, see the
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<em class="citetitle">Berkeley DB Programmer's Reference Guide</em> guide.
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</p>
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<div class="sect1" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="seqlist"></a>Sequences and Related Methods</h2>
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</div>
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</div>
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</div>
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<div class="navtable">
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<table border="1" width="80%">
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<thead>
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<tr>
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<th>Sequences and Related Methods</th>
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<th>Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>
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<a class="xref" href="seqcreate.html" title="db_sequence_create">db_sequence_create</a>
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</td>
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<td>Create a sequence handle</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="seqclose.html" title="DB_SEQUENCE->close()">DB_SEQUENCE->close()</a>
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</td>
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<td>Close a sequence</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="seqget.html" title="DB_SEQUENCE->get()">DB_SEQUENCE->get()</a>
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</td>
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<td>Get the next sequence element(s)</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="seqget_dbp.html" title="DB_SEQUENCE->get_dbp()">DB_SEQUENCE->get_dbp()</a>
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</td>
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<td>Return a handle for the underlying sequence database</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="seqget_key.html" title="DB_SEQUENCE->get_key()">DB_SEQUENCE->get_key()</a>
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</td>
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<td>Return the key for a sequence</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="seqinitial_value.html" title="DB_SEQUENCE->initial_value()">DB_SEQUENCE->initial_value()</a>
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</td>
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<td>Set the initial value of a sequence</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="seqopen.html" title="DB_SEQUENCE->open()">DB_SEQUENCE->open()</a>
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</td>
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<td>Open a sequence</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="seqremove.html" title="DB_SEQUENCE->remove()">DB_SEQUENCE->remove()</a>
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</td>
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<td>Remove a sequence</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="seqstat.html" title="DB_SEQUENCE->stat()">DB_SEQUENCE->stat()</a>
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</td>
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<td>Return sequence statistics</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="seqstat_print.html" title="DB_SEQUENCE->stat_print()">DB_SEQUENCE->stat_print()</a>
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</td>
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<td>Print sequence statistics</td>
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</tr>
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<tr>
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<td colspan="2">
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<span class="bold">
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<strong>Sequences Configuration</strong>
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</span>
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</td>
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</tr>
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<tr>
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<td><a class="xref" href="seqset_cachesize.html" title="DB_SEQUENCE->set_cachesize()">DB_SEQUENCE->set_cachesize()</a>, <a class="xref" href="seqget_cachesize.html" title="DB_SEQUENCE->get_cachesize()">DB_SEQUENCE->get_cachesize()</a></td>
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<td>Set/get the cache size of a sequence</td>
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</tr>
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<tr>
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<td><a class="xref" href="seqset_flags.html" title="DB_SEQUENCE->set_flags()">DB_SEQUENCE->set_flags()</a>, <a class="xref" href="seqget_flags.html" title="DB_SEQUENCE->get_flags()">DB_SEQUENCE->get_flags()</a></td>
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<td>Set/get the flags for a sequence</td>
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</tr>
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<tr>
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<td><a class="xref" href="seqset_range.html" title="DB_SEQUENCE->set_range()">DB_SEQUENCE->set_range()</a>, <a class="xref" href="seqget_range.html" title="DB_SEQUENCE->get_range()">DB_SEQUENCE->get_range()</a></td>
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<td>Set/get the range for a sequence</td>
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</tr>
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</tbody>
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</table>
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</div>
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</div>
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</div>
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<div class="navfooter">
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<hr />
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<table width="100%" summary="Navigation footer">
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="txnset_commit_token.html">Prev</a> </td>
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<td width="20%" align="center"> </td>
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<td width="40%" align="right"> <a accesskey="n" href="seqcreate.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">DB_TXN->set_commit_token() </td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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</td>
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<td width="40%" align="right" valign="top"> db_sequence_create</td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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