Search Toolkit Book for MDB_val
Generic structure used for passing keys and data in and out of the database. More...
#include "lmdb.h"
(Private to src/util/lmdb.)
Collaboration diagram for MDB_val:
Public Attributes | |
| size_t | mv_size |
| size of the data item More... | |
| void * | mv_data |
| address of the data item More... | |
Detailed Description
Generic structure used for passing keys and data in and out of the database.
Values returned from the database are valid only until a subsequent update operation, or the end of the transaction. Do not modify or free them, they commonly point into the database itself.
Key sizes must be between 1 and mdb_env_get_maxkeysize() inclusive. The same applies to data sizes in databases with the MDB_DUPSORT flag. Other data items can in theory be from 0 to 0xffffffff bytes long.
The documentation for this struct was generated from the following file:
- src/util/lmdb/lmdb.h
