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<h2 class="title" style="clear: both"><a id="logprintf"></a>DbEnv::log_printf()</h2>
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<pre class="programlisting">#include <db_cxx.h>
int
DbEnv::log_printf(DB_TXN *txnid, const char *fmt, ...);</pre>
<p>
The <code class="methodname">DbEnv::log_printf()</code> method appends an informational message to
the Berkeley DB database environment log files.
</p>
<p>
The <code class="methodname">DbEnv::log_printf()</code> method allows applications to include
information in the database environment log files, for later review
using the <a class="link" href="db_printlog.html" title="db_printlog">db_printlog</a>
utility. This method is intended for debugging and performance
tuning.
</p>
<p>
The <code class="methodname">DbEnv::log_printf()</code> <span>
<span>
method either returns a non-zero error value or throws an
exception that encapsulates a non-zero error value on
failure, and returns 0 on success.
</span>
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<h3 class="title"><a id="id1685976"></a>Parameters</h3>
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<h4 class="title"><a id="id1685651"></a>txnid</h4>
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<p>
If the logged message refers to an application-specified transaction,
the <span class="bold"><strong>txnid</strong></span> parameter is a transaction
handle returned from <a class="xref" href="txnbegin.html" title="DbEnv::txn_begin()">DbEnv::txn_begin()</a>;
otherwise NULL.
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<h4 class="title"><a id="id1686118"></a>fmt</h4>
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<p>
A format string that specifies how subsequent arguments (or arguments
accessed via the variable-length argument facilities of stdarg(3)) are
converted for output. The format string may contain any formatting
directives supported by the underlying C library vsnprintf(3)
function.
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<h3 class="title"><a id="id1686119"></a>Errors</h3>
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<p>
The <code class="methodname">DbEnv::log_printf()</code> <span>
<span>
method may fail and throw a <a class="link" href="dbexception.html" title="Chapter 6. The DbException Class">DbException</a>
exception, encapsulating one of the following non-zero errors, or return one
of the following non-zero errors:
</span>
</span>
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<h4 class="title"><a id="id1685525"></a>EINVAL</h4>
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An invalid flag value or parameter was specified.
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<h3 class="title"><a id="id1685526"></a>Class</h3>
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<p>
<a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a>,
<a class="link" href="logc.html" title="The DbLogc Handle">DbLogc</a>,
<a class="link" href="lsn.html" title="Chapter 8. The DbLsn Handle">DbLsn</a>
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<h3 class="title"><a id="id1685991"></a>See Also</h3>
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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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