2011-09-13 17:44:24 +00:00
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<title>Db::set_re_len()</title>
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<link rel="up" href="db.html" title="Chapter 2. The Db Handle" />
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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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<th colspan="3" align="center">Db::set_re_len()</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="dbset_re_delim.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 2.
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The Db Handle
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="dbset_re_pad.html">Next</a></td>
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<div>
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<h2 class="title" style="clear: both"><a id="dbset_re_len"></a>Db::set_re_len()</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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int
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Db::set_re_len(u_int32_t re_len); </pre>
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<p>
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For the Queue access method, specify that the records are of length
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<span class="bold"><strong>re_len</strong></span>. For the Queue access method,
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the record length must be enough smaller than the database's page size
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that at least one record plus the database page's metadata information
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can fit on each database page.
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</p>
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<p>
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For the Recno access method, specify that the records are
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fixed-length, not byte-delimited, and are of length <span class="bold"><strong>re_len</strong></span>.
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</p>
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<p>
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Any records added to the database that are less than <span class="bold"><strong>re_len</strong></span> bytes long are automatically padded (see
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<a class="xref" href="dbset_re_pad.html" title="Db::set_re_pad()">Db::set_re_pad()</a> for
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more information).
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</p>
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<p>
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Any attempt to insert records into the database that are greater than
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<span class="bold"><strong>re_len</strong></span> bytes long will cause the call
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to fail immediately and return an error.
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</p>
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<p>
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The <code class="methodname">Db::set_re_len()</code> method configures a database, not only
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operations performed using the specified
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<a class="link" href="db.html" title="Chapter 2. The Db Handle">Db</a> handle.
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</p>
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<p>
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The <code class="methodname">Db::set_re_len()</code> method may not be called after the
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<a class="xref" href="dbopen.html" title="Db::open()">Db::open()</a> method is called. If
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the database already exists when
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<a class="xref" href="dbopen.html" title="Db::open()">Db::open()</a> is called, the
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information specified to <code class="methodname">Db::set_re_len()</code> will be ignored.
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</p>
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<p>
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The <code class="methodname">Db::set_re_len()</code> <span>
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<span>
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method either returns a non-zero error value or throws an
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exception that encapsulates a non-zero error value on
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failure, and returns 0 on success.
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</span>
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</span>
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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="id3580254"></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="id3580264"></a>re_len</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>re_len</strong></span> parameter is the length of
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a Queue or Recno database record, in bytes.
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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="id3580060"></a>Errors</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 <code class="methodname">Db::set_re_len()</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="id3580410"></a>EINVAL</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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If the method was called after <a class="xref" href="dbopen.html" title="Db::open()">Db::open()</a>
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was called; or if 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="id3580432"></a>Class</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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<a class="link" href="db.html" title="Chapter 2. The Db Handle">Db</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="id3580131"></a>See Also</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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<a class="xref" href="db.html#dblist" title="Database and Related Methods">Database and Related Methods</a>
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</p>
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<td width="40%" align="left" valign="top">Db::set_re_delim() </td>
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<td width="40%" align="right" valign="top"> Db::set_re_pad()</td>
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