| mdb(3) | Library Functions Manual | mdb(3) |
NAME¶
mdb - OpenLDAP Lightning Memory-Mapped Database Manager.
SYNOPSIS¶
Modules¶
Version Macros
Environment Flags
Database Flags
Write Flags
Data Structures¶
struct MDB_val
Generic structure used for passing keys and data in and out of the database.
Typedefs¶
typedef unsigned int MDB_dbi
A handle for an individual database in the DB environment. typedef int()
MDB_cmp_func(const MDB_val *a, const MDB_val *b)
A callback function used to compare two keys in a database. typedef void()
MDB_rel_func(MDB_val *item, void *oldptr, void *newptr, void
*relctx)
A callback function used to relocate a position-dependent data item in a
fixed-address database.
Detailed Description¶
OpenLDAP Lightning Memory-Mapped Database Manager.
Data Structure Documentation¶
struct MDB_val¶
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.
Data Fields
size_t mv_size
void * mv_data
Typedef Documentation¶
typedef void() MDB_rel_func(MDB_val *item, void *oldptr, void *newptr, void *relctx)¶
A callback function used to relocate a position-dependent data item in a fixed-address database. The newptr gives the item's desired address in the memory map, and oldptr gives its previous address. The item's actual data resides at the address in item. This callback is expected to walk through the fields of the record in item and modify any values based at the oldptr address to be relative to the newptr address.
Parameters
oldptr The previous address.
newptr The new address to relocate to.
relctx An application-provided context, set by mdb_set_relctx().
Todo
Author¶
Generated automatically by Doxygen for LMDB from the source code.
| Wed Mar 25 2020 | LMDB |