2011-09-13 17:44:24 +00:00
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<title>Sequence Support in the SQL Layer</title>
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<link rel="up" href="upgrade_52_toc.html" title="Chapter 9. Upgrading Berkeley DB 11.2.5.1 applications to Berkeley DB 11.2.5.2" />
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<p>Library Version 11.2.5.2</p>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">Sequence Support in the SQL Layer</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="upgrade_11gr2_52_repmgr_channels.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 9.
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Upgrading Berkeley DB 11.2.5.1 applications to Berkeley DB 11.2.5.2
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="upgrade_11gr2_52_xa.html">Next</a></td>
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<div>
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<h2 class="title" style="clear: both"><a id="upgrade_11gr2_52_seq_sql"></a>Sequence Support in the SQL Layer</h2>
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</div>
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<div class="toc">
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<dl>
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<dt>
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<span class="sect2">
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2011-12-20 00:07:10 +00:00
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<a href="upgrade_11gr2_52_seq_sql.html#id3647516">New Functions</a>
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2011-09-13 17:44:24 +00:00
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</span>
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</dt>
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</dl>
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</div>
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<p>
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A partial implementation of the sequence API defined in the SQL
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2003 specification has been added to the SQL layer. A sequence is
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created using the syntax:
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</p>
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<pre class="programlisting">SELECT create_sequence("sequence_name"...) </pre>
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<p>
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The sequence numbers are accessed using
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</p>
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<pre class="programlisting">SELECT nextval("sequence_name") </pre>
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<p>
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and
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</p>
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<pre class="programlisting">SELECT currval("sequence_name")</pre>
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<p>
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Finally, a sequence can be dropped using
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</p>
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<pre class="programlisting">SELECT drop_sequence("sequence_name")</pre>
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<div class="sect2" 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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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3647516"></a>New Functions</h3>
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2011-09-13 17:44:24 +00:00
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</div>
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</div>
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</div>
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<p>
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The four new functions, which have to be called as part of a
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<code class="literal">SELECT</code> statement, are describe in more
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detail in <a href="../bdb-sql/sequencesupport.html" class="olink">Using Sequences</a> in the
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<em class="citetitle">Berkeley DB Getting Started with the SQL APIs</em> guide.
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</p>
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<div class="itemizedlist">
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<ul type="disc">
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<li>
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<a href="../bdb-sql/sequencesupport.html#create_sequence" class="olink">create_sequence</a>
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</li>
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<li>
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<a href="../bdb-sql/sequencesupport.html#seq_nextval" class="olink">seq_nextval</a>
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</li>
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<li>
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<a href="../bdb-sql/sequencesupport.html#seq_currval" class="olink">seq_currval</a>
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</li>
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<li><a href="../bdb-sql/sequencesupport.html#seq_drop_sequence" class="olink">seq_drop_sequence</a>.
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</li>
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</ul>
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<td width="40%" align="right"> <a accesskey="n" href="upgrade_11gr2_52_xa.html">Next</a></td>
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