Function GetString

db/string.go:26–43

GetString return string object , if key is exist , object load meta otherwise object is null if key is not exist and err is not found otherwise return err

(txn *Transaction, key []byte)

// otherwise object is null if key is not exist and err is not found
// otherwise  return err
func GetString(txn *Transaction, key []byte) (*String, error) {
	str := NewString(txn, key)
	mkey := MetaKey(txn.db, key)
	now := Now()
	Meta, err := txn.t.Get(mkey)
	if err != nil {
		if IsErrNotFound(err) {
			return str, nil
		}
		return nil, err
	}
	if err := str.decode(Meta); err != nil && err != ErrKeyNotFound {
		return nil, err
	}

	str.Meta.UpdatedAt = now
	return str, nil
}

// NewString  create new string object
func NewString(txn *Transaction, key []byte) *String {