#include <db_cxx.h>
int
DbEnv::dbremove(DbTxn *txnid,
const char *file, const char *database, u_int32_t flags);
The DbEnv::dbremove() method removes the database specified by the
file and database parameters. If no database is specified, the underlying file
represented by file is removed,
incidentally removing all of the databases it contained.
Applications should never remove databases with open Db handles, or in the case of removing a file, when any database in the file has an open handle.
The DbEnv::dbremove() method is not atomic in a
sliced environment. If the operation fails, it is possible for
some, but not all, of the sliced databases to still exist.
The DbEnv::dbremove()
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.
DbEnv::dbremove() is affected by any database directory specified using the
DbEnv::add_data_dir()
method, or by setting the add_data_dir string in the environment's
DB_CONFIG file.
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
DB_AUTO_COMMIT flag is specified to either this method
or the environment handle, the operation will be implicitly transaction protected.
The environment variable DB_HOME may be used as the path of
the database environment home.
The DbEnv::dbremove()
method may fail and throw a DbException
exception, encapsulating one of the following non-zero errors, or return one
of the following non-zero errors:
A transactional database environment operation was selected to resolve a deadlock.
DbDeadlockException is thrown if
your Berkeley DB API is configured to throw exceptions.
Otherwise, DB_LOCK_DEADLOCK is returned.
A Berkeley DB Concurrent Data Store database environment configured for lock timeouts was unable to grant a lock in the allowed time.
You attempted to open a database handle that is configured for no waiting exclusive locking, but the exclusive lock could not be immediately obtained. See Db::set_lk_exclusive() for more information.
DbLockNotGrantedException is thrown if
your Berkeley DB API is configured to throw exceptions.
Otherwise, DB_LOCK_NOTGRANTED is returned.
If the method was called before DbEnv::open() was called; or if an invalid flag value or parameter was specified.