2011-09-13 17:44:24 +00:00
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<p>Library Version 11.2.5.2</p>
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<th colspan="3" align="center">Db::err()</th>
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<td width="20%" align="left"><a accesskey="p" href="dbdel.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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<h2 class="title" style="clear: both"><a id="dberr"></a>Db::err()</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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Db::err(int error, const char *fmt, ...);
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Db::errx(const char *fmt, ...);</pre>
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<p>
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The <a class="xref" href="enverr.html" title="DbEnv::err()">DbEnv::err()</a>,
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<code class="methodname">DbEnv::errx()</code>, <code class="methodname">Db::err()</code> and
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<code class="methodname">Db::errx()</code> methods provide error-messaging functionality for
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applications written using the Berkeley DB library.
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</p>
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<p>
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The <code class="methodname">Db::err()</code> and <a class="xref" href="enverr.html" title="DbEnv::err()">DbEnv::err()</a> methods construct
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an error message consisting of the following elements:
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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>
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<span class="bold"><strong>An optional prefix string</strong></span>
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</p>
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<p>
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If no error callback function has been set using the
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<a class="xref" href="envset_errcall.html" title="DbEnv::set_errcall()">DbEnv::set_errcall()</a>
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method, any prefix string specified using the
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<a class="xref" href="envset_errpfx.html" title="DbEnv::set_errpfx()">DbEnv::set_errpfx()</a>
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method, followed by two separating characters: a colon and a
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<space> character.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>An optional printf-style message</strong></span>
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</p>
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<p>
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The supplied message <span class="bold"><strong>fmt</strong></span>, if
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non-NULL, in which the ANSI C X3.159-1989 (ANSI C) printf function
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specifies how subsequent parameters are converted for output.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>A separator</strong></span>
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</p>
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<p>
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Two separating characters: a colon and a <space> character.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>A standard error string</strong></span>
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</p>
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<p>
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The standard system or Berkeley DB library error string associated
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with the <span class="bold"><strong>error</strong></span> value, as returned by
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the <a class="xref" href="envstrerror.html" title="DbEnv::strerror()">DbEnv::strerror()</a>
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method.
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</p>
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</li>
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</ul>
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</div>
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<p>
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The <code class="methodname">Db::errx()</code> and <code class="methodname">DbEnv::errx()</code> methods
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are the same as the <code class="methodname">Db::err()</code> and
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<a class="xref" href="enverr.html" title="DbEnv::err()">DbEnv::err()</a> methods, except they do not append
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the final separator characters and standard error string to the error message.
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</p>
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<p>
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This constructed error message is then handled as follows:
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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>
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If an error callback function has been set (see
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<a class="xref" href="dbset_errcall.html" title="Db::set_errcall()">Db::set_errcall()</a> and
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<a class="xref" href="envset_errcall.html" title="DbEnv::set_errcall()">DbEnv::set_errcall()</a>),
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that function is called with two parameters: any prefix string
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specified (see <a class="xref" href="dbset_errpfx.html" title="Db::set_errpfx()">Db::set_errpfx()</a>
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and <a class="xref" href="envset_errpfx.html" title="DbEnv::set_errpfx()">DbEnv::set_errpfx()</a>) and
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the error message.
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</p>
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</li>
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<li>
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<p>
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If a C library FILE * has been set (see
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<a class="xref" href="dbset_errfile.html" title="Db::set_errfile()">Db::set_errfile()</a> and
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<a class="xref" href="envset_errfile.html" title="DbEnv::set_errfile()">DbEnv::set_errfile()</a>),
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the error message is written to that output stream.
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</p>
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</li>
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<li>
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<p>
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If a C++ ostream has been set (see
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<a class="xref" href="envset_error_stream.html" title="DbEnv::set_error_stream()">DbEnv::set_error_stream()</a>
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and
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<a class="xref" href="dbset_error_stream.html" title="Db::set_error_stream()">Db::set_error_stream()</a>),
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the error message is written to that stream.
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</p>
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</li>
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<li>
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<p>
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If none of these output options have been configured, the error message
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is written to stderr, the standard error output stream.
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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 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="id3561428"></a>Parameters</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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<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="id3561884"></a>error</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>error</strong></span> parameter is the error
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value for which the <a class="xref" href="enverr.html" title="DbEnv::err()">DbEnv::err()</a>
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and <code class="methodname">Db::err()</code> methods will display an explanatory string.
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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="id3562037"></a>fmt</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>fmt</strong></span> parameter is an optional
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printf-style message to display.
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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="id3561996"></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="id3562062"></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"><a accesskey="p" href="dbdel.html">Prev</a> </td>
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<a accesskey="u" href="db.html">Up</a>
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<td width="40%" align="right"> <a accesskey="n" href="dbexists.html">Next</a></td>
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<td width="40%" align="left" valign="top">Db::del() </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"> Db::exists()</td>
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