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4.7 KiB
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<!--$Id: db_err.so,v 10.11 1999/12/20 08:52:27 bostic Exp $-->
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<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.-->
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<html>
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<head>
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<title>Berkeley DB: DbEnv::err</title>
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<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
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<meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++">
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</head>
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<body bgcolor=white>
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<a name="2"><!--meow--></a>
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<table><tr valign=top>
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<td>
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<h1>DbEnv::err</h1>
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</td>
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<td width="1%">
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<a href="../api_cxx/cxx_index.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
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</td></tr></table>
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<hr size=1 noshade>
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<tt>
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<h3><pre>
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#include <db_cxx.h>
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<p>
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DbEnv::err(int error, const char *fmt, ...);
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<p>
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DbEnv::errx(const char *fmt, ...);
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<p>
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Db::err(int error, const char *fmt, ...);
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<p>
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Db::errx(const char *fmt, ...);
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</pre></h3>
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<h1>Description</h1>
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<p>The DbEnv::err, DbEnv::errx, Db::err and
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Db::errx methods provide error messaging functionality for
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applications written using the Berkeley DB library.
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<p>The DbEnv::err method constructs an error message consisting of the
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following elements:
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<p><blockquote><p><dl compact>
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<p><dt>An optional prefix string<dd>If no error callback method has been set using the
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<a href="../api_cxx/env_set_errcall.html">DbEnv::set_errcall</a> method, any prefix string specified using the
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<a href="../api_cxx/env_set_errpfx.html">DbEnv::set_errpfx</a> method, followed by two separating characters: a colon
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and a <space> character.
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<p><dt>An optional printf-style message<dd>The supplied message <b>fmt</b>, if non-NULL, where the ANSI C X3.159-1989 (ANSI C)
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printf function specifies how subsequent arguments are converted for
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output.
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<p><dt>A separator<dd>Two separating characters: a colon and a <space> character.
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<p><dt>A standard error string<dd>The standard system or Berkeley DB library error string associated with the
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<b>error</b> value, as returned by the <a href="../api_cxx/env_strerror.html">DbEnv::strerror</a> method.
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</dl>
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</blockquote>
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<p>This constructed error message is then handled as follows:
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<p><blockquote>
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<p>If an error callback method has been set (see <a href="../api_cxx/db_set_errcall.html">Db::set_errcall</a>
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and <a href="../api_cxx/env_set_errcall.html">DbEnv::set_errcall</a>), that method is called with two
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arguments: any prefix string specified (see <a href="../api_cxx/db_set_errpfx.html">Db::set_errpfx</a> and
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<a href="../api_cxx/env_set_errpfx.html">DbEnv::set_errpfx</a>), and the error message.
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<p>If a C library FILE * has been set (see <a href="../api_cxx/db_set_errfile.html">Db::set_errfile</a> and
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<a href="../api_cxx/env_set_errfile.html">DbEnv::set_errfile</a>), the error message is written to that output
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stream.
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<p>If a C++ ostream has been set
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(see <a href="../api_cxx/env_set_error_stream.html">DbEnv::set_error_stream</a>), the error message is written to that
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stream.
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<p>If none of these output options has been configured, the error message
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is written to stderr, the standard error output stream.</blockquote>
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<p>The DbEnv::errx and Db::errx methods perform identically to the
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DbEnv::err and Db::err methods except that they do not append
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the final separator characters and standard error string to the error
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message.
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<h3>Class</h3>
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<a href="../api_cxx/dbenv_class.html">DbEnv</a>
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<h1>See Also</h1>
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<a href="../api_cxx/env_close.html">DbEnv::close</a>,
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<a href="../api_cxx/env_open.html">DbEnv::open</a>,
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<a href="../api_cxx/env_remove.html">DbEnv::remove</a>,
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<a href="../api_cxx/db_err.html">DbEnv::err</a>,
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<a href="../api_cxx/env_strerror.html">DbEnv::strerror</a>,
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<a href="../api_cxx/env_version.html">DbEnv::version</a>,
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<a href="../api_cxx/env_set_cachesize.html">DbEnv::set_cachesize</a>,
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<a href="../api_cxx/env_set_errcall.html">DbEnv::set_errcall</a>,
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<a href="../api_cxx/env_set_errfile.html">DbEnv::set_errfile</a>,
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<a href="../api_cxx/env_set_error_stream.html">DbEnv::set_error_stream</a>,
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<a href="../api_cxx/env_set_errpfx.html">DbEnv::set_errpfx</a>,
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<a href="../api_cxx/env_set_flags.html">DbEnv::set_flags</a>,
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<a href="../api_cxx/env_set_mutexlocks.html">DbEnv::set_mutexlocks</a>,
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<a href="../api_cxx/env_set_paniccall.html">DbEnv::set_paniccall</a>,
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and
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<a href="../api_cxx/env_set_verbose.html">DbEnv::set_verbose</a>.
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</tt>
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