73 lines
3.7 KiB
HTML
73 lines
3.7 KiB
HTML
<!--$Id: env_set_error_stream.html 63573 2008-05-23 21:43:21Z trent.nelson $-->
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<!--Copyright (c) 1997,2008 Oracle. All rights reserved.-->
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<!--See the file LICENSE for redistribution information.-->
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<html>
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<head>
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<title>Berkeley DB: DbEnv::set_error_stream</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,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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<table width="100%"><tr valign=top>
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<td>
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<b>DbEnv::set_error_stream</b>
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</td>
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<td align=right>
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<a href="../api_cxx/api_core.html"><img src="../images/api.gif" alt="API"></a>
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<a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a></td>
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</tr></table>
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<hr size=1 noshade>
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<tt>
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<b><pre>
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#include <db_cxx.h>
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<p>
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void DbEnv::set_error_stream(class ostream*);
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</pre></b>
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<hr size=1 noshade>
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<b>Description: DbEnv::set_error_stream</b>
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<p>When an error occurs in the Berkeley DB library, an exception is thrown or an
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<b>errno</b> value is returned by the interface. In some cases,
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however, the <b>errno</b> value may be insufficient to completely
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describe the cause of the error, especially during initial application
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debugging.</p>
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<p>The DbEnv::set_error_stream and <a href="../api_cxx/db_set_error_stream.html">Db::set_error_stream</a> methods
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are used to enhance the mechanism for reporting error messages to the
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application by setting the C++ ostream used for displaying additional
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Berkeley DB error messages. In some cases, when an error occurs, Berkeley DB will
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output an additional error message to the specified stream.</p>
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<p>The error message will consist of the prefix string and a colon
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("<b>:</b>") (if a prefix string was previously specified using
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<a href="../api_cxx/env_set_errpfx.html">DbEnv::set_errpfx</a>), an error string, and a trailing
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<newline> character.</p>
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<p>Setting <b>stream</b> to NULL unconfigures the interface.</p>
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<p>Alternatively, you can use the <a href="../api_cxx/env_set_errfile.html">DbEnv::set_errfile</a> and
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<a href="../api_cxx/db_set_errfile.html">Db::set_errfile</a> methods to display the additional information via a C
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library FILE *, or the <a href="../api_cxx/env_set_errcall.html">DbEnv::set_errcall</a> and
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<a href="../api_cxx/db_set_errcall.html">Db::set_errcall</a> methods to capture the additional error information
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in a way that does not use either output streams or C library FILE *'s.
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You should not mix these approaches.</p>
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<p>This error-logging enhancement does not slow performance or significantly
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increase application size, and may be run during normal operation as well
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as during application debugging.</p>
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<p>The DbEnv::set_error_stream method configures operations performed using the specified
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<a href="../api_cxx/env_class.html">DbEnv</a> handle, not all operations performed on the underlying
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database environment.</p>
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<p>The DbEnv::set_error_stream method may be called at any time during the life of the
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application.</p>
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<b>Parameters</b> <br>
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<b>stream</b><ul compact><li>The <b>stream</b> parameter is the application-specified output stream to
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be used for additional error information.</ul>
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<br>
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<hr size=1 noshade>
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<br><b>Class</b>
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<a href="../api_cxx/env_class.html">DbEnv</a>
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<br><b>See Also</b>
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<a href="../api_cxx/env_list.html">Database Environments and Related Methods</a>
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</tt>
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<table width="100%"><tr><td><br></td><td align=right>
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<a href="../api_cxx/api_core.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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<p><font size=1>Copyright (c) 1996,2008 Oracle. All rights reserved.</font>
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