2011-09-13 17:44:24 +00:00
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<title>DbSequence</title>
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<link rel="start" href="index.html" title="Berkeley DB C++ API Reference" />
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<link rel="up" href="seq.html" title="Chapter 12. The DbSequence Handle" />
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<link rel="prev" href="seq.html" title="Chapter 12. The DbSequence Handle" />
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<link rel="next" href="seqclose.html" title="DbSequence::close()" />
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<div xmlns="" class="navheader">
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<div class="libver">
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<p>Library Version 11.2.5.2</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">DbSequence</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="seq.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 12.
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The DbSequence Handle
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="seqclose.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="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="seqcreate"></a>DbSequence</h2>
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</div>
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</div>
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</div>
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<pre class="programlisting">#include <db_cxx.h>
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class DbSequence {
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public:
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DbSequence(Db *db, u_int32_t flags);
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~DbSequence();
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DB_SEQUENCE *DbSequence::get_DB();
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const DB *DbSequence::get_const_DB() const;
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static DbSequence *DbSequence::get_DbSequence(DB *db);
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static const DbSequence
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*DbSequence::get_const_DbSequence(const DB *db);
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...
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}; </pre>
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<p>
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The <code class="classname">DbSequence</code> handle is the handle used to manipulate a sequence
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object. A sequence object is stored in a record in a database.
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</p>
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<p>
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<code class="classname">DbSequence</code> handles are free-threaded if the
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<a class="link" href="seqopen.html#seqopen_DB_THREAD">DB_THREAD</a>
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flag is specified to the
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<a class="xref" href="seqopen.html" title="DbSequence::open()">DbSequence::open()</a>
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method when the sequence is opened. Once the
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<a class="xref" href="seqclose.html" title="DbSequence::close()">DbSequence::close()</a> or
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<a class="xref" href="seqremove.html" title="DbSequence::remove()">DbSequence::remove()</a>
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methods are called, the handle can not be accessed again, regardless
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of the method's return.
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</p>
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<p>
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Each handle opened on a sequence may maintain a separate cache of values which are
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returned to the application using the <a class="xref" href="seqget.html" title="DbSequence::get()">DbSequence::get()</a>
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method either singly or in groups
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depending on its <span class="bold"><strong>delta</strong></span> parameter.
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</p>
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<p>
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Calling the <a class="xref" href="seqclose.html" title="DbSequence::close()">DbSequence::close()</a>
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or <a class="xref" href="seqremove.html" title="DbSequence::remove()">DbSequence::remove()</a>
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methods discards this handle.
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</p>
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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="id3647792"></a>Parameters</h3>
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</div>
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</div>
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</div>
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<div class="sect3" 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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<h4 class="title"><a id="id3647795"></a>db</h4>
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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 <span class="bold"><strong>db</strong></span> parameter is an open database
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handle which holds the persistent data for the sequence. The database
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may be of any type, but must not have been configured to support
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duplicate data items.
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</p>
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</div>
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<div class="sect3" 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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<h4 class="title"><a id="id3647511"></a>flags</h4>
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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 <span class="bold"><strong>flags</strong></span> parameter is
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currently unused, and must be set to 0.
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</p>
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</div>
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</div>
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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="id3647470"></a>Errors</h3>
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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 <code class="methodname">db_sequence_create</code> <span>
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<span>
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method may fail and throw a <a class="link" href="dbexception.html" title="Chapter 6. The DbException Class">DbException</a>
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exception, encapsulating one of the following non-zero errors, or return one
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of the following non-zero errors:
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</span>
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</span>
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</p>
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<div class="sect3" 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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<h4 class="title"><a id="id3647902"></a>EINVAL</h4>
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</div>
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</div>
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</div>
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<p>
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An invalid flag value or parameter was specified.
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</p>
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</div>
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</div>
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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="id3647873"></a>Class</h3>
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</div>
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</div>
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</div>
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<p>
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<a class="link" href="seq.html" title="Chapter 12. The DbSequence Handle">DbSequence</a>
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</p>
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</div>
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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="id3647818"></a>See Also</h3>
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</div>
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</div>
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</div>
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<p>
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<a class="xref" href="seq.html#seqlist" title="Sequences and Related Methods">Sequences and Related Methods</a>
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</p>
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<a accesskey="u" href="seq.html">Up</a>
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<td width="40%" align="right"> <a accesskey="n" href="seqclose.html">Next</a></td>
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<td width="40%" align="left" valign="top">Chapter 12.
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The DbSequence Handle
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</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 width="40%" align="right" valign="top"> DbSequence::close()</td>
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