Berkeley DB: Dbc.del
Полезная информация

Dbc.del


import com.sleepycat.db.*;

public int del(int flags) throws DbException;

Description

The Dbc.del method deletes the key/data pair currently referenced by the cursor.

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 reference 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 throws an exception that encapsulates EINVAL.

Otherwise, the Dbc.del method throws an exception that encapsulates an errno on failure.

Errors

If a fatal error occurs in Berkeley DB, the Dbc.del method may fail and throw a DbRunRecoveryException, at which point all subsequent database calls will also fail in the same way.

The Dbc.del method may fail and throw an exception for any of the errors specified for the following Berkeley DB and C library functions: __account_page(3), dbenv->db_paniccall(3), fflush(3), fprintf(3), free(3), func(3), DbLockTab.get, DbLock.put, DbLockTab.vec, DbLog.put, malloc(3), memcpy(3), memmove(3), DbMpoolFile.get, DbMpoolFile.put, DbMpoolFile.set, memset(3), realloc(3), strerror(3), vfprintf(3), and vsnprintf(3).

In addition, the Dbc.del method may fail and throw an exception encapsulating errno for the following conditions:

EAGAIN
A lock was unavailable.

EINVAL
An invalid flag value or parameter was specified.

Class

Dbc

See Also

Dbc.close, Dbc.del, Dbc.get and Dbc.put.