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