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<!--$Id: db_err.so,v 1.3 2002/08/18 21:15:48 bostic Exp $-->
<!--$Id: env_err.so,v 10.34 2006/04/27 20:17:47 bostic Exp $-->
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<title>Berkeley DB: Db::err</title>
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<b>Db::err</b>
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<tt>
<b><pre>
#include <db_cxx.h>
<p>
Db::err(int error, const char *fmt, ...);
<p>
Db::errx(const char *fmt, ...);
</pre></b>
<hr size=1 noshade>
<b>Description: Db::err</b>
<p>The <a href="../api_cxx/env_err.html">DbEnv::err</a>, <a href="../api_cxx/env_err.html">DbEnv::errx</a>, Db::err and
Db::errx methods provide error-messaging functionality for
applications written using the Berkeley DB library.</p>
<p>The Db::err and <a href="../api_cxx/env_err.html">DbEnv::err</a> methods constructs an error message
consisting of the following elements:</p>
<blockquote><br>
<b>An optional prefix string</b><ul compact><li>If no error callback function has been set using the
<a href="../api_cxx/env_set_errcall.html">DbEnv::set_errcall</a> method, any prefix string specified using the
<a href="../api_cxx/env_set_errpfx.html">DbEnv::set_errpfx</a> method, followed by two separating characters: a colon
and a <space> character.</ul>
<b>An optional printf-style message</b><ul compact><li>The supplied message <b>fmt</b>, if non-NULL, in which the
ANSI C X3.159-1989 (ANSI C) printf function specifies how subsequent parameters
are converted for output.</ul>
<b>A separator</b><ul compact><li>Two separating characters: a colon and a <space> character.</ul>
<b>A standard error string</b><ul compact><li>The standard system or Berkeley DB library error string associated with the
<b>error</b> value, as returned by the <a href="../api_cxx/env_strerror.html">DbEnv::strerror</a> method.</ul>
<br>
</blockquote>
<p>The Db::errx and <a href="../api_cxx/env_err.html">DbEnv::errx</a> methods are the same as the
Db::err and <a href="../api_cxx/env_err.html">DbEnv::err</a> methods, except they do not append the
final separator characters and standard error string to the error
message.</p>
<p>This constructed error message is then handled as follows:</p>
<blockquote><p>If an error callback function has been set (see <a href="../api_cxx/db_set_errcall.html">Db::set_errcall</a>
and <a href="../api_cxx/env_set_errcall.html">DbEnv::set_errcall</a>), that function is called with two
parameters: any prefix string specified (see <a href="../api_cxx/db_set_errpfx.html">Db::set_errpfx</a> and
<a href="../api_cxx/env_set_errpfx.html">DbEnv::set_errpfx</a>) and the error message.</p>
<p>If a C library FILE * has been set (see <a href="../api_cxx/db_set_errfile.html">Db::set_errfile</a> and
<a href="../api_cxx/env_set_errfile.html">DbEnv::set_errfile</a>), the error message is written to that output
stream.</p>
<p>If a C++ ostream has been set
(see <a href="../api_cxx/env_set_error_stream.html">DbEnv::set_error_stream</a> and <a href="../api_cxx/db_set_error_stream.html">Db::set_error_stream</a>),
the error message is written to that stream.</p>
<p>If none of these output options has been configured, the error message
is written to stderr, the standard error output stream.</p></blockquote>
<b>Parameters</b> <br>
<b>error</b><ul compact><li>The <b>error</b> parameter is the error value for which the
<a href="../api_cxx/env_err.html">DbEnv::err</a> and Db::err methods will display a explanatory
string.</ul>
<b>fmt</b><ul compact><li>The <b>fmt</b> parameter is an optional printf-style message to display.</ul>
<br>
<hr size=1 noshade>
<br><b>Class</b>
<a href="../api_cxx/db_class.html">Db</a>
<br><b>See Also</b>
<a href="../api_cxx/db_list.html">Databases and Related Methods</a>
</tt>
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