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<title>Berkeley DB: Db::set_feedback</title>
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<h1>Db::set_feedback</h1>
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<h3><pre>
#include <db_cxx.h>
<p>
int
Db::set_feedback(
void (*db_feedback_fcn)(DB *dbp, int opcode, int pct));
</pre></h3>
<h1>Description</h1>
<p>Some operations performed by the Berkeley DB library can take non-trivial
amounts of time. The Db::set_feedback method can be used by
applications to monitor progress within these operations.
<p>When an operation is likely to take a long time, Berkeley DB will call the
specified callback method. This method must be declared with
three arguments: the first will be a reference to the enclosing database
handle; the second a flag value; and the third the percent of the
operation that has been completed, specified as an integer value between
0 and 100. It is up to the callback method to display this
information in an appropriate manner.
<p>The <b>opcode</b> argument may take on any of the following values:
<p><dl compact>
<p><dt><a name="DB_UPGRADE">DB_UPGRADE</a><dd>The underlying database is being upgraded.
<p><dt><a name="DB_VERIFY">DB_VERIFY</a><dd>The underlying database is being verified.
</dl>
<p>The Db::set_feedback interface may be called at any time during the life of
the application.
<p>The Db::set_feedback method either returns a non-zero error value or throws an exception that
encapsulates a non-zero error value on failure, and returns 0 on success.
<h1>Class</h1>
<a href="../api_cxx/db_class.html">Db</a>
<h1>See Also</h1>
<a href="../api_cxx/db_list.html">Databases and Related Methods</a>
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