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Dbc::del

 APIRef 

#include <db_cxx.h>


int
Dbc::del(u_int32_t flags);

Description

The Dbc::del method deletes the key/data pair to which the cursor refers.

When called on a cursor opened 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 flags parameter is currently unused, and must be set to 0.

The cursor position is unchanged after a delete, and subsequent calls to cursor functions expecting the cursor to refer to an existing key will fail.

If the element has already been deleted, Dbc::del will return DB_KEYEMPTY.

If the cursor is not yet initialized, the Dbc::del method either returns EINVAL or throws an exception that encapsulates EINVAL.

Otherwise, the Dbc::del 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.

Errors

The Dbc::del method may fail and throw an exception or return a non-zero error for the following conditions:

DB_LOCK_DEADLOCK
The operation was selected to resolve a deadlock.

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.

EPERM
Write attempted on read-only cursor when the DB_INIT_CDB flag was specified to DbEnv::open.

The Dbc::del method may fail and throw an exception or return a non-zero error for errors specified for other Berkeley DB and C library or system methods. If a catastrophic error has occurred, the Dbc::del method may fail and either return DB_RUNRECOVERY or throw an exception encapsulating DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way.

Class

Dbc

See Also

Dbc::close, Dbc::count, Dbc::del, Dbc::dup, Dbc::get, Dbc::pget, and Dbc::put.

APIRef

Copyright Sleepycat Software @ 1.1 log @Initial revision @ text @d1 1 a1 1 @ 1.1.1.1 log @Import: RPM 4.0.3 @ text @@ 1.1.1.2 log @Import: RPM 4.0.4 @ text @d1 1 a1 1 d17 1 a17 1 APIRef d79 1 a79 1 APIRef @ 1.1.1.3 log @Import: RPM 4.0.5 @ text @d1 2 a2 2 a3 1 d38 4 a41 4

If the element has already been deleted, the Dbc::del method will return DB_KEYEMPTY. If the cursor is not yet initialized, the Dbc::del method either returns EINVAL or throws an exception that encapsulates EINVAL. Otherwise, the Dbc::del method either returns a non-zero error value or throws an exception that d46 3 a60 4

If the operation was selected to resolve a deadlock, the Dbc::del method will fail and and either return DB_LOCK_DEADLOCK or throw a DbDeadlockException exception. d62 4 a65 4 If a catastrophic error has occurred, the Dbc::del method may fail and either return DB_RUNRECOVERY or throw a DbRunRecoveryException, in which case all subsequent Berkeley DB calls will fail in the same way. d69 8 a76 1 Database Cursors and Related Methods @ 1.1.1.4 log @Import: RPM 4.1 @ text @d1 2 a2 2 d4 1 d39 4 a42 4

If the element has already been deleted, Dbc::del will return DB_KEYEMPTY.

If the cursor is not yet initialized, the Dbc::del method either returns EINVAL or throws an exception that encapsulates EINVAL.

Otherwise, the Dbc::del method either returns a non-zero error value or throws an exception that a46 3

DB_LOCK_DEADLOCK
The operation was selected to resolve a deadlock.

d59 4 d64 4 a67 4 If a catastrophic error has occurred, the Dbc::del method may fail and either return DB_RUNRECOVERY or throw an exception encapsulating DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way. d71 1 a71 8 Dbc::close, Dbc::count, Dbc::del, Dbc::dup, Dbc::get, Dbc::pget, and Dbc::put. @ 1.1.1.5 log @Import: RPM 4.1.1 @ text @d1 2 a2 2 a3 1 d38 4 a41 4

If the element has already been deleted, the Dbc::del method will return DB_KEYEMPTY. If the cursor is not yet initialized, the Dbc::del method either returns EINVAL or throws an exception that encapsulates EINVAL. Otherwise, the Dbc::del method either returns a non-zero error value or throws an exception that d46 3 a60 4

If the operation was selected to resolve a deadlock, the Dbc::del method will fail and and either return DB_LOCK_DEADLOCK or throw a DbDeadlockException exception. d62 4 a65 4 If a catastrophic error has occurred, the Dbc::del method may fail and either return DB_RUNRECOVERY or throw a DbRunRecoveryException, in which case all subsequent Berkeley DB calls will fail in the same way. d69 8 a76 1 Database Cursors and Related Methods @