// Dup duplicates an existing DB handle
func (db *MDBM) Dup() (dup *MDBM, err error) {
db.mutex.Lock()
defer db.mutex.Unlock()
dup = &MDBM{
flags: db.flags,
perms: db.perms,
psize: db.psize,
dsize: db.dsize,
}
C.mdbm_iter_init(&dup.iter)
dup.dbh, err = C.mdbm_dup_handle(db.dbh, 0)
if err != nil {
return nil, err
}
return dup, nil
}
// Open opens an existing DB or creates a new DB. Options can be passed in
// using these setters:
// mdbm.Flags (Default mdbm.ReadWrite | mdbm.Create)
// mdbm.Perms (Default 0600)
// mdbm.PageSize (Default 4KB)
// mdbm.StartSize (Default 1MB)
func Open(dbfile string, options ...option) (db *MDBM, err error) {
db = &MDBM{
flags: ReadWrite | Create,
perms: 0666,
psize: 0,
dsize: 0,
}
C.mdbm_iter_init(&db.iter)
for _, opt := range options {
opt(db)
}
fn := C.CString(dbfile)
defer C.free(unsafe.Pointer(fn))
db.dbh, err = C.mdbm_open(fn, C.int(db.flags), C.int(db.perms), C.int(db.psize), C.int(db.dsize))
if err != nil {
return nil, err
}
return db, nil
}
// Restart resets DB iterator
func (db *MDBM) Restart() {
C.mdbm_iter_init(&db.iter)
}