int DBcursor->c_del(DBC *cursor, u_int32_t flags);
The DBcursor->c_del function 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 function, the DB->del function 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, DBcursor->c_del will return DB_KEYEMPTY.
If the cursor is not yet initialized, the DBcursor->c_del function will return EINVAL.
Otherwise, the DBcursor->c_del function returns a non-zero error value on failure and 0 on success.
The DBcursor->c_del function may fail and return a non-zero error for the following conditions:
The DBcursor->c_del function may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions. If a catastrophic error has occurred, the DBcursor->c_del function may fail and return DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way.
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