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Berkeley DB: Db::truncate
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Db::truncate
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#include <db_cxx.h>
int
Db::truncate(DbTxn *txnid, u_int32_t *countp, u_int32_t flags);
Description: Db::truncate
The Db::truncate method empties the database, discarding all records
it contains. The number of records discarded from the database is
returned in countp.
When called on a database configured with secondary indices using the
Db::associate method, the Db::truncate method truncates the primary
database and all secondary indices. A count of the records discarded
from the primary database is returned.
It is an error to call the Db::truncate method on a database with open
cursors.
The Db::truncate 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
countp- The countp parameter references memory into which
the number of records discarded from the database is copied.
flags- The flags parameter is currently unused, and must be set to 0.
txnid- If the operation is part of an application-specified transaction, the
txnid parameter is a transaction handle returned from
DbEnv::txn_begin; if the operation is part of a Berkeley DB Concurrent Data Store group, the
txnid parameter is a handle returned from
DbEnv::cdsgroup_begin; otherwise NULL.
If no transaction handle is
specified, but the
operation occurs in a transactional
database,
the operation will be implicitly transaction protected.
Errors
The Db::truncate method
may fail and throw
DbException,
encapsulating one of the following non-zero errors, or return one of
the following non-zero errors:
EINVAL- If there are open cursors in the database; or if an
invalid flag value or parameter was specified.
If a transactional database environment operation was selected to
resolve a deadlock, the Db::truncate method will fail and
either return DB_LOCK_DEADLOCK or
throw a DbDeadlockException exception.
If a Berkeley DB Concurrent Data Store database environment configured for lock timeouts was unable
to grant a lock in the allowed time, the Db::truncate method will fail and
either return DB_LOCK_NOTGRANTED or
throw a DbLockNotGrantedException exception.
Class
Db
See Also
Databases and Related Methods
Copyright (c) 1996,2008 Oracle. All rights reserved.