Get gets value of key from KVDB, returns in callback.

GetOrPut gets value of key from KVDB, if val not exists or is "", put key-value to KVDB.

GetRange retrives key-value items of specified key range, returns in callback.

Initialize the KVDB Called by game server engine.

NextLargerKey finds the next key that is larger than the specified key, but smaller than any other keys that is larger than the specified key.

Put puts key-value item to KVDB, returns in callback.

KVDBGetCallback is type of KVDB Get callback.

KVDBGetOrPutCallback is type of KVDB GetOrPut callback.

KVDBGetRangeCallback is type of KVDB GetRange callback.

KVDBPutCallback is type of KVDB Get callback.