【脚本语言系列】关于PythonNoSQL数据库处理redis,你需要知道的事

如何使用redis

# -*- coding:utf-8 -*-import redis# stringconn = redis.Redis()conn.keys("*")conn.set("Allen","Moore")conn.set("Age", 24)conn.get("Allen")conn.get("Age")conn.set("Stature",160)conn.get("Stature")conn.set("Weight","160")conn.setnx("Weight","160")conn.get("Weight")conn.getset("Weight","80kg")conn.getrange("Weight", -1,-2)conn.setrange("Weight",0, "160Jin")conn.mset({"Hobby":"Program","Major":"Automation"})conn.delete("Weight")conn.incr("Age")conn.incr("Age", 10)conn.decr("Age")conn.decr("Age",15)conn.set("Weight","80")conn.incrbyfloat("Weight")conn.incrbyfloat("Weight",0.5)

# -*- coding:utf-8 -*-import redis# list only with stringconn = redis.Redis()print conn.lpush("bigmarket","pear")print conn.lpush("bigmarket","apple","banana")print conn.linsert("bigmarket","before","cantaloupe","peach")print conn.linsert("bigmarket","after","ctarine","honeydew")print conn.lset("bigmarket",2,"plum")print conn.rpush("bigmarket","grape")print conn.lindex("bigmarket",3)print conn.lrange("bigmarket",0,2)print conn.ltrim("bigmarket",1,4)             print conn.lrange("bigmarket",0,-1)

57-1-1True8apple['banana', 'apple', 'plum']True['apple', 'plum', 'apple', 'plum']

# -*- coding:utf-8 -*-import redis# hash likes dictconn = redis.Redis()print conn.hmset("song",{"do":"a beer","re":"about a beer"})print conn.hset("song","fa","a heart to a thing")print conn.hget("song","fa")print conn.hmget("song","do","re")print conn.hkeys("song")print conn.hvals("song")print conn.hlen("song")print conn.hgetall("song")print conn.hsetnx("song","so","a hobby to a dinner")

True1a heart to a thing['a beer', 'about a beer']['do', 're', 'fa']['a beer', 'about a beer', 'a heart to a thing']3{'do': 'a beer', 'fa': 'a heart to a thing', 're': 'about a beer'}1

# -*- coding:utf-8 -*-import redis# set same with setconn = redis.Redis()print conn.sadd("store","apple","banana","lemon","melon")print conn.scard("store")print conn.smembers("store")print conn.srem("store","banana")print conn.smembers("store")print conn.sadd("new_store","banana","lemon","melon","orange")print conn.sinter("store","new_store")print conn.sinterstore("supermarket","store","new_store")print conn.smembers("supermarket")print conn.sunion("store","new_store")print conn.sunionstore("littlemarket","store","new_store")print conn.smembers("littlemarket")print conn.sdiff("store","new_store")print conn.sdiffstore("diffmarket","store","new_store")print conn.smembers("diffmarket")

14set(['melon', 'lemon', 'apple', 'banana'])1set(['melon', 'lemon', 'apple'])0set(['melon', 'lemon'])2set(['melon', 'lemon'])set(['orange', 'melon', 'lemon', 'apple', 'banana'])5set(['orange', 'melon', 'lemon', 'apple', 'banana'])set(['apple'])1set(['apple'])

# -*- coding:utf-8 -*-import time# zset same with zset# rank# second index# time seriesnow = time.time()print conn.zadd("logins","Allen",now)print conn.zadd("logins","Moore",now+(5*60))print conn.zadd("logins","Aaron",now+(2*60*60))print conn.zadd("logins","Mose",now+(24*60*60))print conn.zrank("logins","Aaron")print conn.zscore("logins","Aaron")print conn.zrange("logins",0,-1)print conn.zrange("logins",0,-1, withscores = True)

111151497590410.06['smeagol', 'Allen', 'sauron', 'Moore', 'bilbo', 'Aaron', 'treebeard', 'Mose'][('smeagol', 1497583134.492), ('Allen', 1497583210.058), ('sauron', 1497583434.492), ('Moore', 1497583510.058), ('bilbo', 1497590334.492), ('Aaron', 1497590410.058), ('treebeard', 1497669534.492), ('Mose', 1497669610.058)]

# -*- coding:utf-8import time# bit same with bitsetdays = ["2017-02-25","2017-02-26","2017-02-27"]big_spender = 1089tire_kicker = 40459late_joiner = 550212conn.setbit(days[0],big_spender, 1)conn.setbit(days[0],tire_kicker, 1)conn.setbit(days[1],big_spender, 1)conn.setbit(days[2],big_spender, 1)conn.setbit(days[2],late_joiner, 1)for day in days:    print conn.bitcount(day)print conn.getbit(days[1], tire_kicker)print conn.bitop("and", "everyday", *days)print conn.bitcount("everyday")print conn.getbit("everyday",big_spender)print conn.bitop("or","alldays",*days)print conn.bitcount("alldays")

21206877711687773

import time# expiration datekey = "now see it"print conn.set(key, "but not for long")print conn.expire(key, 5)print conn.ttl(key)conn.get(key)time.sleep(6)print conn.get(key)

TrueTrue5None

什么是redis

redis是基于内存的数据结构服务器。
redis存储数据到磁盘，可以存储不限于字符串的多种数据结构。