func (db *Db) Get(_txn *Txn, key []byte, getbuff *uintptr, flags uint32) ([]byte, error) {
var data *C.char = (*C.char)(unsafe.Pointer(*getbuff))
var datalen C.uint
var txn *C.DB_TXN = nil
if _txn != nil {
txn = _txn.txn
}
ret := C.db_get(
db.db,
txn,
(*C.char)(unsafe.Pointer(&key[0])),
C.uint(len(key)),
&data,
&datalen,
C.uint(flags),
)
err := ResultToError(ret)
if err == nil {
*getbuff = uintptr(unsafe.Pointer(data))
if data == nil {
return nil, nil
} else {
r := C.GoBytes(unsafe.Pointer(data), C.int(datalen))
//C.free(unsafe.Pointer(data))
return r, nil
}
}
return nil, err
}
func (db BerkeleyDB) Get(txn Transaction, key []byte, flags DbFlag) ([]byte, error) {
data := &C.DBT{flags: C.DB_DBT_REALLOC}
defer data.Free()
cKey := AllocDBT(key)
defer cKey.Free()
err := Err(C.db_get(db.ptr, txn.ptr, cKey, data, C.u_int32_t(flags)))
if err != nil {
return nil, err
}
return cloneToBytes(data), ok
}
func (db *DB) Get(key []byte) ([]byte, error) {
db.lk.Lock()
defer db.lk.Unlock()
k := C.str{unsafe.Pointer(&key[0]), C.size_t(len(key))}
v := C.str{}
n, err := C.db_get(db.db, &k, &v)
switch {
case n < 0:
return []byte{}, err
case n > 0:
return []byte{}, ErrKeyNotFound(string(key))
}
return C.GoBytes(v.data, C.int(v.size)), nil
}
// Get records from the database. The consume flag makes sense only in
// combination with a queue database and causes the operation to wait
// for and obtain the next enqueued record.
func (db Database) Get(txn Transaction, consume bool, recs ...proto.Message) (err error) {
var key, data C.DBT
var flags C.u_int32_t = 0
if consume {
key.flags |= C.DB_DBT_USERMEM
flags |= C.DB_CONSUME_WAIT
} else {
key.flags |= C.DB_DBT_READONLY
}
data.flags |= C.DB_DBT_REALLOC
defer C.free(data.data)
for _, rec := range recs {
err = db.marshalKey(&key, rec)
if err == nil {
key.ulen = key.size
} else {
return
}
err = check(C.db_get(db.ptr, txn.ptr, &key, &data, flags))
if err != nil {
return
}
err = db.unmarshalData(&data, rec)
if err != nil {
return
}
err = db.unmarshalKey(&key, rec)
if err != nil {
return
}
}
return
}