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<!--$Id: db_err.so,v 1.3 2002/08/18 21:15:48 bostic Exp $-->
<!--$Id: env_err.so,v 10.32 2004/09/28 15:04:20 bostic Exp $-->
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<title>Berkeley DB: Db::err</title>
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<h3>Db::err</h3>
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<h3><pre>
#include <db_cxx.h>
<p>
Db::err(int error, const char *fmt, ...);
<p>
Db::errx(const char *fmt, ...);
</pre></h3>
<hr size=1 noshade>
<h3>Description: Db::err</h3>
<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 <a href="../api_cxx/env_err.html">DbEnv::err</a> method constructs an error message consisting of the
following elements:</p>
<blockquote><dl compact>
<dt>An optional prefix string<dd>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.
<dt>An optional printf-style message<dd>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.
<dt>A separator<dd>Two separating characters: a colon and a <space> character.
<dt>A standard error string<dd>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.
</dl>
</blockquote>
<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>
<h3>Parameters</h3>
<dl compact>
<dt><b>error</b><dd>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.
<dt><b>fmt</b><dd>The <b>fmt</b> parameter is an optional printf-style message to display.
</dl>
<p>The <a href="../api_cxx/env_err.html">DbEnv::errx</a> and Db::errx methods perform identically to the
<a href="../api_cxx/env_err.html">DbEnv::err</a> and Db::err methods, except that they do not append
the final separator characters and standard error string to the error
message.</p>
<h3>Parameters</h3>
<dl compact>
<dt><b>error</b><dd>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.
<dt><b>fmt</b><dd>The <b>fmt</b> parameter is an optional printf-style message to display.
</dl>
<hr size=1 noshade>
<h3>Class</h3>
<a href="../api_cxx/db_class.html">Db</a>
<h3>See Also</h3>
<a href="../api_cxx/db_list.html">Databases and Related Methods</a>
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