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Berkeley DB: DB->del
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DB->del
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#include <db.h>
int
DB->del(DB *db, DB_TXN *txnid, DBT *key, u_int32_t flags);
Description: DB->del
The DB->del method removes key/data pairs from the database. The
key/data pair associated with the specified key is discarded from
the database. In the presence of duplicate key values, all records
associated with the designated key will be discarded.
When called on a database that has been made into a secondary index
using the DB->associate method, the DB->del method deletes the
key/data pair from the primary database and all secondary indices.
The DB->del method will return DB_NOTFOUND if the specified key is not in the database.
The DB->del method will return DB_KEYEMPTY if the database is a Queue or Recno database and
the specified key exists, but was never explicitly created by the
application or was later deleted.
Unless otherwise specified, the DB->del method
returns a non-zero error value on failure
and 0 on success.
Parameters
flags- The flags parameter is currently unused, and must be set to 0.
key
txnid- If the operation is part of an application-specified transaction, the
txnid parameter is a transaction handle returned from
DB_ENV->txn_begin; if the operation is part of a Berkeley DB Concurrent Data Store group, the
txnid parameter is a handle returned from
DB_ENV->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->del method
may fail and return one of the following non-zero errors:
DB_LOCK_DEADLOCK- A transactional database environment operation was selected to resolve
a deadlock.
DB_LOCK_NOTGRANTED- A Berkeley DB Concurrent Data Store database environment configured for lock timeouts was unable
to grant a lock in the allowed time.
DB_REP_HANDLE_DEAD- The database handle has been invalidated because a replication election
unrolled a committed transaction.
DB_REP_LOCKOUT- The operation was blocked by client/master synchronization.
DB_SECONDARY_BAD- A secondary index references a nonexistent primary key.
EACCES- An attempt was made to modify a read-only database.
EINVAL- An
invalid flag value or parameter was specified.
Class
DB
See Also
Databases and Related Methods
Copyright (c) 1996,2008 Oracle. All rights reserved.