#include <db_cxx.h>

void Db::set_message_stream(class ostream*);

There are interfaces in the Berkeley DB library which either directly output informational messages or statistical information, or configure the library to output such messages when performing other operations, for example, DbEnv::set_verbose and DbEnv::stat_print.

The DbEnv::set_message_stream and Db::set_message_stream methods are used to display these messages for the application. In this case, the message will include a trailing <newline> character.

Setting stream to NULL unconfigures the interface.

Alternatively, you can use the DbEnv::set_msgfile and Db::set_msgfile methods to display the messages via a C library FILE *, or the DbEnv::set_msgcall and Db::set_msgcall 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.

For Db handles opened inside of Berkeley DB environments, calling the Db::set_message_stream method affects the entire environment and is equivalent to calling the DbEnv::set_message_stream method.

The Db::set_message_stream method configures operations performed using the specified Db handle, not all operations performed on the underlying database.

The Db::set_message_stream method may be called at any time during the life of the application.

• The stream parameter is the application-specified output stream to be used for additional message information.