#include <hamsterdb.h>
Data Fields | |
ham_u16_t | size |
void * | data |
ham_u32_t | flags |
ham_u32_t | _flags |
A generic key.
A key represents key items in hamsterdb. Before using a key, it is important to initialize all key fields with zeroes, i.e. with the C library routines memset(3) or bzero(2).
hamsterdb usually uses keys to insert, delete or search for items. However, when using Database Cursors and the function ham_cursor_move, hamsterdb also returns keys. In this case, the pointer to the key data is provided in data. This pointer is only temporary and will be overwritten by subsequent calls to ham_cursor_move.
To avoid this, the calling application can allocate the data pointer. In this case, you have to set the flag HAM_KEY_USER_ALLOC. The size parameter will then return the size of the key. It's the responsibility of the caller to make sure that the data parameter is large enough for the key.
Definition at line 119 of file hamsterdb.h.
The size of the key, in bytes
Definition at line 122 of file hamsterdb.h.
Referenced by ham::key::get_size(), ham::key::key(), and ham::key::set_size().