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Release 5.2.28 on 6/10/2011
2011-09-13 17:44:24 +00:00
<?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>DB_ENV-&gt;log_put()</title>
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<link rel="start" href="index.html" title="Berkeley DB C API Reference" />
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<p>Library Version 11.2.5.2</p>
</div>
<table width="100%" summary="Navigation header">
<tr>
<th colspan="3" align="center">DB_ENV-&gt;log_put()</th>
</tr>
<tr>
<td width="20%" align="left"><a accesskey="p" href="logprintf.html">Prev</a> </td>
<th width="60%" align="center">Chapter 7. 
The DB_LSN Handle
</th>
<td width="20%" align="right"> <a accesskey="n" href="envlog_set_config.html">Next</a></td>
</tr>
</table>
<hr />
</div>
<div class="sect1" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h2 class="title" style="clear: both"><a id="logput"></a>DB_ENV-&gt;log_put()</h2>
</div>
</div>
</div>
<pre class="programlisting">#include &lt;db.h&gt;
int
DB_ENV-&gt;log_put(DB_ENV *env,
DB_LSN *lsn, const DBT *data, u_int32_t flags); </pre>
<p>
The <code class="methodname">DB_ENV-&gt;log_put()</code> method appends records to the log. The
<a class="link" href="lsn.html" title="Chapter 7.  The DB_LSN Handle">DB_LSN</a> of the put record is
returned in the <span class="bold"><strong>lsn</strong></span> parameter.
</p>
<p>
The <code class="methodname">DB_ENV-&gt;log_put()</code> <span>
<span>
method returns a non-zero error value on failure and 0 on success.
</span>
</span>
</p>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
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<h3 class="title"><a id="id3728650"></a>Parameters</h3>
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</div>
</div>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
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<h4 class="title"><a id="id3728654"></a>lsn</h4>
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</div>
</div>
</div>
<p>
The <span class="bold"><strong>lsn</strong></span> parameter references memory
into which the <a class="link" href="lsn.html" title="Chapter 7.  The DB_LSN Handle">DB_LSN</a> of
the put record is copied.
</p>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
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<h4 class="title"><a id="id3728549"></a>data</h4>
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</div>
</div>
</div>
<p>
The <span class="bold"><strong>data</strong></span> parameter is the record to
write to the log.
</p>
<p>
The caller is responsible for providing any necessary structure to
<span class="bold"><strong>data</strong></span>. (For example, in a write-ahead
logging protocol, the application must understand what part of
<span class="bold"><strong>data</strong></span> is an operation code, what part
is redo information, and what part is undo information. In addition,
most transaction managers will store in <span class="bold"><strong>data</strong></span> the
<a class="link" href="lsn.html" title="Chapter 7.  The DB_LSN Handle">DB_LSN</a> of the previous log
record for the same transaction, to support chaining back through the
transaction's log records during undo.)
</p>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
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<h4 class="title"><a id="id3728587"></a>flags</h4>
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</div>
</div>
</div>
<p>
The <span class="bold"><strong>flags</strong></span> parameter must be set to 0
or the following value:
</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p><a id="put_DB_FLUSH"></a>
<code class="literal">DB_FLUSH</code>
</p>
<p>
The log is forced to disk after this record is written, guaranteeing
that all records with <a class="link" href="lsn.html" title="Chapter 7.  The DB_LSN Handle">DB_LSN</a>
values less than or equal to the one being "put" are on disk
before <code class="methodname">DB_ENV-&gt;log_put()</code> returns.
</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
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<h3 class="title"><a id="id3728609"></a>Errors</h3>
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</div>
</div>
</div>
<p>
The <code class="methodname">DB_ENV-&gt;log_put()</code> <span>
<span>
method may fail and return one of the following non-zero errors:
</span>
</span>
</p>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
Release 5.2.36 on 9/14/2022
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<h4 class="title"><a id="id3728766"></a>EINVAL</h4>
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</div>
</div>
</div>
<p>
If the record to be logged is larger than the maximum log record; or
if an invalid flag value or parameter was specified.
</p>
</div>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
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<h3 class="title"><a id="id3728789"></a>Class</h3>
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</div>
</div>
</div>
<p>
<a class="link" href="env.html" title="Chapter 5.  The DB_ENV Handle">DB_ENV</a>,
<a class="link" href="logc.html" title="The DB_LOGC Handle">DB_LOGC</a>,
<a class="link" href="lsn.html" title="Chapter 7.  The DB_LSN Handle">DB_LSN</a>
</p>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
Release 5.2.36 on 9/14/2022
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<h3 class="title"><a id="id3728936"></a>See Also</h3>
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</div>
</div>
</div>
<p>
<a class="xref" href="lsn.html#loglist" title="Logging Subsystem and Related Methods">Logging Subsystem and Related Methods</a>
</p>
</div>
</div>
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<hr />
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<td width="40%" align="left"><a accesskey="p" href="logprintf.html">Prev</a> </td>
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<a accesskey="u" href="lsn.html">Up</a>
</td>
<td width="40%" align="right"> <a accesskey="n" href="envlog_set_config.html">Next</a></td>
</tr>
<tr>
<td width="40%" align="left" valign="top">DB_ENV-&gt;log_printf() </td>
<td width="20%" align="center">
<a accesskey="h" href="index.html">Home</a>
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<td width="40%" align="right" valign="top"> DB_ENV-&gt;log_set_config()</td>
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