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Berkeley DB: Dbc::dup
Dbc::dup
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#include <db_cxx.h>
int
Dbc::dup(Dbc **cursorp, u_int32_t flags);
Description: Dbc::dup
The Dbc::dup method creates a new cursor that uses the same transaction
and locker ID as the original cursor. This is useful when an application
is using locking and requires two or more cursors in the same thread of
control.
The Dbc::dup 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.
Parameters
- flags
- The flags parameter must be set to 0 or by bitwise inclusively OR'ing together one
or more of the following values:
- DB_POSITION
- The newly created cursor is initialized to refer to the same position
in the database as the original cursor (if any) and hold the same locks
(if any). If the DB_POSITION flag is not specified, or the
original cursor does not hold a database position and locks, the created
cursor is uninitialized and will behave like a cursor newly created
using Db::cursor.
Errors
The Dbc::dup method
may fail and throw
DbException,
encapsulating one of the following non-zero errors, or return one of
the following non-zero errors:
- DB_REP_HANDLE_DEAD
- The database handle has been invalidated because a replication election
unrolled a committed transaction.
- EINVAL
- An
invalid flag value or parameter was specified.
Class
Dbc
See Also
Database Cursors and Related Methods
Copyright (c) 1996-2004 Sleepycat Software, Inc. - All rights reserved.
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