Redis 數(shù)據(jù)庫hash數(shù)據(jù)類型是一個string類型的key和value的映射表，適用于存儲對象。Redis 中每個 hash 可以存儲 232 - 1 鍵值對（40多億）。?
Python的redis模塊實現(xiàn)了Redis哈希（Hash）命令行操作的幾乎全部命令，包括HDEL、HEXISTS、HGET、HGETALL、HINCRBY、HKEYS、HLEN 、HMGET 、HMSET 、HSET 、HSETNX 、HVALS 。但是無法支持HINCRBYFLOAT 、HSCAN 等命令。

函數(shù)說明

HDEL: 刪除對應(yīng)哈希（Hash）表的指定鍵（key）的字段，hdel(self, name, key)

HEXISTS: 檢測哈希（Hash）表對應(yīng)鍵（key）字段是否存在，返回布爾邏輯，hexists(self, name, key)

HGET: 獲取哈希（Hash）指定鍵（key）對應(yīng)的值，hget(self, name, key)

HGETALL: 獲取哈希(Hash)表的鍵-值對（key-value pairs）,返回python字典類型數(shù)據(jù)，hgetall(self, name)

HINCRBY: 為哈希表（Hash）指定鍵（key）對應(yīng)的值（key）加上指定的整數(shù)數(shù)值（int，可為負(fù)值），參見 [Python操作Redis：字符串(String)]，(http://blog.csdn.net/u012894975/article/details/51285733)hincrby(self, name, key, amount=1)，Redis 中本操作的值被限制在 64 位(bit)有符號數(shù)字。

HKEYS: 返回哈希表（Hash）對應(yīng)鍵（key）的數(shù)組（Python稱之為列表List），hkeys(self, name)

HLEN: 獲取哈希表（Hash）中鍵-值對（key-value pairs）個數(shù)，hlen(self, name)

HMGET: 獲取哈希表（Hash）中一個或多個給點字段的值，不存在返回nil(Redis命令行)/None(Python)，hmget(self, name, keys)，其中keys可以為列表（list）

HMSET: 設(shè)置對個鍵-值對（key-value pairs）到哈希表（Hash）中，python輸入值（mapping）為字典（dictionary）類型，hmset(self, name, mapping)

HSET: 為哈希表（Hash）賦值，若鍵（key）存在值（value）則覆蓋，不存在則創(chuàng)建，hset(self, name, key, value)

HSETNX：為哈希表（Hash）不存值（value）的鍵（key）賦值，存在操作無效，對應(yīng)值（value）無變化，hsetnx(self, name, key, value)

HVALS：返回哈希表（Hash）對應(yīng)值（value）的列表，hvals(self, name)

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# -*- coding:utf-8 -*- import sys reload(sys) sys.setdefaultencoding('utf-8') import redis import time ## Connect local redis service client =redis.Redis(host='127.0.0.1',port=6379,db=0) print "Connection to server successfully!" dicKeys = client.keys("*") print dicKeys#-----------------------------10----------------------------------------- ### Redis hash command part Start ### # hset: Set key to value with hash name,hset(self, name, key, value) # hget: Return the value of ``key`` within the hash ``name``, hget(self, name, key) client.hset('myhash','field1',"foo") hashVal = client.hget('myhash','field1') print "Get hash value:",hashVal#------------------------------3------------------------------------------ # Get none-value hashVal = client.hget('myhash','field2') print "None hash value:",hashVal#---------------------------------2-------------------------------------------- # hexists: Returns a boolean indicating if ``key`` exists within hash ``name`` keyList= ['field1','field2'] for key in keyList:hexists = client.hexists('myhash',key)if hexists :print "Exist in redis-hash key:",keyelse:print "Not exist in redis-hash key:",key# hgetall: Return a Python dict of the hash's name/value pairs client.hset('myhash','field2',"bar") valDict = client.hgetall('myhash') print "Get python-dict from redis-hash",valDict# hincrby: Increment the value of ``key`` in hash ``name`` by ``amount`` # default increment is 1, client.hset('myhash','field',20)#-----------------------------------5---------------------------------------- client.hincrby('myhash','field') print "Get incrby value(Default):",client.hget('myhash','field') client.hincrby('myhash','field',2) print "Get incrby value(step: 2):",client.hget('myhash','field') client.hincrby('myhash','field',-3) print "Get incrby value(step: -3):",client.hget('myhash','field')# no method hincrbyfloat #-----------------------------------6---------------------------------------- #hkeys: Return the list of keys within hash ``name`` kL = client.hkeys('myhash') print "Get redis-hash key list",kL#-----------------------------------7---------------------------------------- #hlen: Return the number of elements in hash ``name`` lenHash =client.hlen('myhash') print "All hash length:",lenHash#-----------------------------------8---------------------------------------- #hmget: Returns a list of values ordered identically to ``keys`` #hmget(self, name, keys), keys should be python list data structure val =client.hmget('myhash',['field','field1','field2','field3','fieldx']) print "Get all redis-hash value list:",val#-----------------------------------9---------------------------------------- #hmset: Sets each key in the ``mapping`` dict to its corresponding value in the hash ``name`` hmDict={'field':'foo','field1':'bar'} client.hmset('hash',hmDict) hmKeys=hmDict.keys()#設(shè)置完畢#-----------------------------------8---------------------------------------- val = client.hmget('hash',hmKeys) print "Get hmset value:",val#-----------------------------------1---------------------------------------- #hdel: Delete ``key`` from hash ``name`` client.hdel('hash','field') print "Get delete result:",client.hget('hash','field')#----------------------------------12--------------------------------------- #hvals: Return the list of values within hash ``name`` val = client.hvals('myhash') print "Get redis-hash values with HVALS",valprint"-----------------------------11----------------------------------------" #----------------------------------11--------------------------------------- #hsetnx: Set ``key`` to ``value`` within hash ``name`` if ``key`` does not exist. # Returns 1 if HSETNX created a field, otherwise 0. r=client.hsetnx('myhash','field',2)#這句話的意思是,試圖為myhash的field賦值為2 print "Check hsetnx execute result:",r," Value:",client.hget('myhash','field') r=client.hsetnx('myhash','field10',20) print "Check hsetnx execute result:",r,"Value",client.hget('myhash','field10')hashVal = client.hgetall('profile') print hashVal #Empty db # client.flushdb()#這句話會把所有數(shù)據(jù)都清除掉

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