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Berkeley DB: DbEnv::set_error_stream
DbEnv::set_error_stream
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#include <db_cxx.h>
void DbEnv::set_error_stream(class ostream*);
Description: DbEnv::set_error_stream
When an error occurs in the Berkeley DB library, an exception is thrown or an
errno value is returned by the interface. In some cases,
however, the errno value may be insufficient to completely
describe the cause of the error, especially during initial application
debugging.
The DbEnv::set_error_stream and Db::set_error_stream methods
are used to enhance the mechanism for reporting error messages to the
application by setting the C++ ostream used for displaying additional
Berkeley DB error messages. In some cases, when an error occurs, Berkeley DB will
output an additional error message to the specified stream.
The error message will consist of the prefix string and a colon
(":") (if a prefix string was previously specified using
DbEnv::set_errpfx), an error string, and a trailing
<newline> character.
Setting stream to NULL unconfigures the interface.
Alternatively, you can use the DbEnv::set_errfile and
Db::set_errfile methods to display the additional information via a C
library FILE *, or the DbEnv::set_errcall and
Db::set_errcall methods to capture the additional error information
in a way that does not use either output streams or C library FILE *'s.
You should not mix these approaches.
This error-logging enhancement does not slow performance or significantly
increase application size, and may be run during normal operation as well
as during application debugging.
Parameters
- stream
- The stream parameter is the application-specified output stream to
be used for additional error information.
Class
DbEnv
See Also
Database Environments and Related Methods
Copyright (c) 1996-2004 Sleepycat Software, Inc. - All rights reserved.
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