Python-Redis的Hash操作
Redis的hash是一个string类型的field和value的映射表，特别适合用于存储对象，每个hash可以存储40多亿键值对
hset(name, key, value)：创建一个name的类别，类别里创建key-value键值对，如果已经存在就修改
hgetall(name)：获取name对应的hash中全部的key和value
127.0.0.1:6379> hset info name jack (integer) 1 127.0.0.1:6379> hset info age 22 (integer) 1 127.0.0.1:6379> hgetall info 1) "name" 2) "jack" 3) "age" 4) "22"
hsetnx(name, key, value)：当name对应的hash中不存在当前key时则创建成功（相当于添加）
127.0.0.1:6379> hsetnx info id 11 (integer) 1 127.0.0.1:6379> hsetnx info id 12 (integer) 0 127.0.0.1:6379> hgetall info 1) "name" 2) "jack" 3) "age" 4) "22" 5) "id" 6) "11"
hget(name,key)：获取name对应的hash中key的value
127.0.0.1:6379> hgetall info 1) "name" 2) "jack" 3) "age" 4) "22" 5) "id" 6) "11" 127.0.0.1:6379> hget info name "jack" 127.0.0.1:6379> hget info age "22" 127.0.0.1:6379> hget info id "11"
hmset(name, **kwags)：在name对应的hash中批量设置键值对
127.0.0.1:6379> hmset language China Chinese US English OK 127.0.0.1:6379> hgetall language 1) "China" 2) "Chinese" 3) "US" 4) "English"
hmget(name, keys)：在name对应的hash中获取多个key的值
127.0.0.1:6379> hgetall info 1) "name" 2) "jack" 3) "age" 4) "22" 5) "id" 6) "11" 127.0.0.1:6379> hmget info name age id 1) "jack" 2) "22" 3) "11"
hlen(name)：获取name对应的hash中键值对的个数
127.0.0.1:6379> hgetall info 1) "name" 2) "jack" 3) "age" 4) "22" 5) "id" 6) "11" 127.0.0.1:6379> hlen info (integer) 3
hkeys(name)：获取name对应的hash中所有的key的值
127.0.0.1:6379> hgetall info 1) "name" 2) "jack" 3) "age" 4) "22" 5) "id" 6) "11" 127.0.0.1:6379> hkeys info 1) "name" 2) "age" 3) "id"
hvals(name)：获取name对应的hash中所有的value的值
127.0.0.1:6379> hgetall info 1) "name" 2) "jack" 3) "age" 4) "22" 5) "id" 6) "11" 127.0.0.1:6379> hvals info 1) "jack" 2) "22" 3) "11"
hdel(name,*keys)：将name对应的hash中指定key的键值对删除
127.0.0.1:6379> hgetall info 1) "name" 2) "jack" 3) "age" 4) "22" 5) "id" 6) "11" 127.0.0.1:6379> hdel info id (integer) 1 127.0.0.1:6379> hgetall info 1) "name" 2) "jack" 3) "age" 4) "22"
hexists(name, key)：判断name对应的hash中是否存在这个key
127.0.0.1:6379> hgetall info 1) "name" 2) "jack" 3) "age" 4) "22" 127.0.0.1:6379> hexists info id (integer) 0
hincrby(name, key, amount=1)：自增name对应的hash中的指定key的值，不存在则创建key=amount，amount为整型
127.0.0.1:6379> hgetall info 1) "name" 2) "jack" 3) "age" 4) "22" 127.0.0.1:6379> hincrby info age 2 (integer) 24 127.0.0.1:6379> hincrby info age 1 (integer) 25 127.0.0.1:6379> hgetall info 1) "name" 2) "jack" 3) "age" 4) "25"
hincrbyfloat(name, key, amount=1.0)：自增name对应的hash中的指定key的值，不存在则创建key=amount，amount为浮点型
127.0.0.1:6379> hgetall info 1) "name" 2) "jack" 3) "age" 4) "25" 127.0.0.1:6379> hincrbyfloat info age 1.2 "26.2" 127.0.0.1:6379> hincrbyfloat info age 1.3 "27.5" 127.0.0.1:6379> hgetall info 1) "name" 2) "jack" 3) "age" 4) "27.5"
hscan(name, cursor=0, match=None, count=None)：获取name对应的hash中匹配的key
cursor为游标（基于游标分批取获取数据），match为匹配指定key，默认None 表示所有的key，count为每次分片最少获取个数，默认None表示采用Redis的默认分片个数
127.0.0.1:6379> hgetall info
1) "name"
2) "jack"
3) "age"
4) "27.5"
5) "name_1"
6) "john"
7) "age_1"
8) "31"
9) "name_2"
10) "jane"
11) "age_2"
12) "31"
13) "name_3"
14) "Andy"
15) "age_3"
16) "11"
17) "id"
18) "11"
19) "id_1"
20) "22"
21) "id_2"
22) "33"
23) "id_3"
24) "44"
127.0.0.1:6379> hscan info 0 match a* # 匹配以a开头的
1) "0"
2) 1) "age"
2) "27.5"
3) "age_1"
4) "31"
5) "age_2"
6) "31"
7) "age_3"
8) "11"
127.0.0.1:6379> hscan info 0 match *a* # 匹配包含a的
1) "0"
2) 1) "name"
2) "jack"
3) "age"
4) "27.5"
5) "name_1"
6) "john"
7) "age_1"
8) "31"
9) "name_2"
10) "jane"
11) "age_2"
12) "31"
13) "name_3"
14) "Andy"
15) "age_3"
16) "11"
hscan_iter(name, match=None, count=None)：为迭代hscan
