edis哈希表

### redis文档
http://redisdoc.com/

### hset
127.0.0.1:6379> hset dog color white name xiaobao
(integer) 2
### hget
127.0.0.1:6379> hget dog color
"white"
### hexists
127.0.0.1:6379> hexists dog color
(integer) 1
### hlen
127.0.0.1:6379> hlen dog
(integer) 2
### hkeys
127.0.0.1:6379> hkeys dog
1) "color"
2) "name"
### hvals
127.0.0.1:6379> hvals dog
1) "white"
2) "xiaobao"
### hmget
127.0.0.1:6379> hmget dog color name
1) "white"
2) "xiaobao"
### hstrlen
127.0.0.1:6379> hstrlen dog color
(integer) 5