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214 lines
8.6 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>DbEnv::log_put()</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="lsn.html" title="Chapter 8. The DbLsn Handle" />
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<link rel="prev" href="logprintf.html" title="DbEnv::log_printf()" />
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<link rel="next" href="envlog_set_config.html" title="DbEnv::log_set_config()" />
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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 11.2.5.2</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">DbEnv::log_put()</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="logprintf.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 8.
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The DbLsn Handle
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="envlog_set_config.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="logput"></a>DbEnv::log_put()</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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DbEnv::log_put(DbLsn *lsn, const Dbt *data, u_int32_t flags);</pre>
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<p>
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The <code class="methodname">DbEnv::log_put()</code> method appends records to the log. The
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<a class="link" href="lsn.html" title="Chapter 8. The DbLsn Handle">DbLsn</a> of the put record is
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returned in the <span class="bold"><strong>lsn</strong></span> parameter.
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</p>
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<p>
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The <code class="methodname">DbEnv::log_put()</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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<h3 class="title"><a id="id3619729"></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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<h4 class="title"><a id="id3619719"></a>lsn</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>lsn</strong></span> parameter references memory
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into which the <a class="link" href="lsn.html" title="Chapter 8. The DbLsn Handle">DbLsn</a> of
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the put record is copied.
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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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<h4 class="title"><a id="id3618933"></a>data</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>data</strong></span> parameter is the record to
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write to the log.
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</p>
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<p>
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The caller is responsible for providing any necessary structure to
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<span class="bold"><strong>data</strong></span>. (For example, in a write-ahead
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logging protocol, the application must understand what part of
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<span class="bold"><strong>data</strong></span> is an operation code, what part
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is redo information, and what part is undo information. In addition,
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most transaction managers will store in <span class="bold"><strong>data</strong></span> the
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<a class="link" href="lsn.html" title="Chapter 8. The DbLsn Handle">DbLsn</a> of the previous log
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record for the same transaction, to support chaining back through the
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transaction's log records during undo.)
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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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<h4 class="title"><a id="id3619173"></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 must be set to 0
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or the following value:
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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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<p><a id="put_DB_FLUSH"></a>
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<code class="literal">DB_FLUSH</code>
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</p>
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<p>
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The log is forced to disk after this record is written, guaranteeing
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that all records with <a class="link" href="lsn.html" title="Chapter 8. The DbLsn Handle">DbLsn</a>
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values less than or equal to the one being "put" are on disk
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before <code class="methodname">DbEnv::log_put()</code> returns.
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</p>
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</li>
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</ul>
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</div>
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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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<h3 class="title"><a id="id3619103"></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">DbEnv::log_put()</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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<h4 class="title"><a id="id3620024"></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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If the record to be logged is larger than the maximum log record; or
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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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<h3 class="title"><a id="id3620006"></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="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a>,
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<a class="link" href="logc.html" title="The DbLogc Handle">DbLogc</a>,
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<a class="link" href="lsn.html" title="Chapter 8. The DbLsn Handle">DbLsn</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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<h3 class="title"><a id="id3620046"></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="lsn.html#loglist" title="Logging Subsystem and Related Methods">Logging Subsystem and Related Methods</a>
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</p>
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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="logprintf.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="lsn.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="envlog_set_config.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">DbEnv::log_printf() </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"> DbEnv::log_set_config()</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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