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Berkeley DB: Db::set_feedback
Db::set_feedback
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#include <db_cxx.h>
int
Db::set_feedback(
void (*db_feedback_fcn)(DB *dbp, int opcode, int pct));
Description
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.
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.
The opcode argument may take on any of the following values:
- DB_UPGRADE
- The underlying database is being upgraded.
- DB_VERIFY
- The underlying database is being verified.
The Db::set_feedback interface may be used to configure Berkeley DB at any time
during the life of the application.
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.
Class
Db
See Also
Db::associate,
Db::close,
Db::cursor,
Db::del,
Db::err, Db::errx
Db::fd,
Db::get,
Db::pget,
Db::get_byteswapped,
Db::get_type,
Db::join,
Db::key_range,
Db::open,
Db::put,
Db::remove,
Db::rename,
Db::set_alloc,
Db::set_append_recno,
Db::set_bt_compare,
Db::set_bt_minkey,
Db::set_bt_prefix,
Db::set_cachesize,
Db::set_dup_compare,
Db::set_errcall,
Db::set_errfile,
Db::set_errpfx,
Db::set_feedback,
Db::set_flags,
Db::set_h_ffactor,
Db::set_h_hash,
Db::set_h_nelem,
Db::set_lorder,
Db::set_pagesize,
Db::set_paniccall,
Db::set_q_extentsize,
Db::set_re_delim,
Db::set_re_len,
Db::set_re_pad,
Db::set_re_source,
Db::stat,
Db::sync,
Db::truncate,
Db::upgrade,
and
Db::verify.
Copyright Sleepycat Software
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