Package dobadger Fast key-value DB badger 的帮助函数 @see https://github.com/dgraph-io/badger @see https://dgraph.io/docs/badger/get-started/ @see https://blog.csdn.net/qq_42057154/article/details/123739565.

Package dobolt boltdb 的帮助函数 读写前，务必先创建桶，否则会报空指针错误 @see https://github.com/etcd-io/bbolt.