void Db::set_error_stream(class ostream*);
When an error occurs in the Berkeley DB library, an exception is thrown or an
errno value is returned by the method. In some cases,
however, the errno value may be insufficient to completely
describe the cause of the error, especially during initial application
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
Alternatively, you can use the DbEnv::set_errfile method to display
the additional information via a C library FILE *, or the
DbEnv::set_errcall method 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.
For Db handles opened inside of Berkeley DB environments, calling the
Db::set_error_stream method affects the entire environment and is equivalent to calling
the DbEnv::set_error_stream method.
Databases and Related Methods
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