+I$Berkeley DB: Dbc::del[P

Dbc::del





#include <db_cxx.h>

intDbc::del(u_int32_t flags);





Description



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

EThe flags parameter is currently unused, and must be set to 0.

HThe cursor position is unchanged after a delete, and subsequent calls toGcursor functions expecting the cursor to reference an existing key willfail.

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

2If the cursor is not yet initialized, the Dbc::delMmethod either returns EINVAL or throws an exception that encapsulates EINVAL.

Otherwise, the Dbc::del>method either returns errno or throws an exception that:encapsulates an errno on failure, and 0 on success.



Errors

OIf a fatal error occurs in Berkeley DB, the Dbc::del method may fail and eitherIreturn DB_RUNRECOVERY or throw an exception encapsulating DB_RUNRECOVERY,Gat which point all subsequent database calls will also fail in the sameFway. Methods marked as returning errno will, by default, throwHan exception that encapsulates the error information. The default error\behavior can be changed, see DbException.

The Dbc::del&method may fail and throw an exceptionKfor 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,8DbLock::put,>DbLockTab::vec,6DbLog::put, malloc(3), memcpy(3), memmove(3),BDbMpoolFile::get,BDbMpoolFile::put,BDbMpoolFile::set, memset(3), realloc(3), strerror(3), vfprintf(3),and vsnprintf(3).

In addition, the Dbc::del&method may fail and throw an exceptionor return errnofor the following conditions:

(

EAGAIN
A lock was unavailable.


B

EINVAL
An invalid flag value or parameter was specified.







Class

.Dbc



See Also

6Dbc::close, Dbc::del,1Dbc::getand2Dbc::put.
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