Shulou(Shulou.com)06/01 Report--

Transferred from: http://www.diybl.com/course/3_program/python/20110510/555370.html

# 1. Installation

Well, I admit I only know how to install the simplest.

Sudo apt-get install redis-server

Python support package: (actually only one file, you can use it when you get it)

Sudo apt-get install python-redis

# 2. Configuration

Configure it. The default configuration file is "/ etc/redis/redis.conf"

Bind ip:

"bind 127.0.0.1"-> "bind 10.0.1.7"

Changing disk synchronization to out-of-sync or per-second synchronization is too slow to keep synchronizing:

"appendfsync always"-> "appendfsync no"

Check whether the background execution is turned on:

"daemonize yes"

Or anything else you want to set, such as:

Connection timeout: "timeout 300"

Running level: "loglevel notice" (personally, I think the default one is good. If there is no big exception, there is no need to change it to debug)

# 3. Use

#! / usr/bin/env python

# coding=utf-8

Import redis

Print redis.__file__

# connection, optional for different databases

R = redis.Redis (host='10.0.1.7', port=6379, db=0)

#

# look at the message

Info = r.info ()

For key in info:

Print's'% s'% (key, info [key])

# check database size

Print'\ ndbsize:% s'% r.dbsize ()

# look at the connection

Print's "ping" r.ping ()

# Select a database

# r.select (2)

# move data to 2 database

# r.move ('axioma2)

# other

# r.save ('a') # storing data

# r.lastsave ('a') # take the last save time

# r.flush () # Refresh

# r.shutdown () # close all clients, stop all services, and exit the server

#

#-

# it has four types: string (key,value), list (sequence), set (collection), and zset (ordered collection with one more sequential attribute)

# I don't know which type you use?

# print r.get_type ('a') # can tell you

#

# string operation

Print'-'* 20

# plug data

R ['c1'] =' bar'

# or

R.set ('c2pm, jingle')

# there is a getset attribute here. If it is True, you can create the contents of the last storage at the same time when saving new data.

Print 'getset:',r.getset (' c2mom JJ')

# if you want to set an incrementing integer, it increments by 1 each time it is executed:

Print 'incr:',r.incr (' a')

# if you want to set a decreasing integer please:

Print 'decr:',r.decr (' a')

# fetching data

Print'r [']:', r ['c1']

# or

Print 'get:',r.get (' a')

# or pick up a batch at the same time

Print 'mget:',r.mget (' C1', 'c2')

# or take a batch of them at the same time (key) is very similar and you don't want to lose all of them

Print 'keys:',r.keys (' caterpillar')

# or maybe you just want to take one at random:

Print 'randomkey:',r.randomkey ()

# check whether a data has one or no zero

Print 'existes:',r.exists (' a')

# Delete data 1 is deleted successfully 0 and None is no such thing

Print 'delete:',r.delete (' cc')

# Oh, by the way, it supports batch operations.

Print 'delete:',r.delete (' C1', 'c2')

# other

R.rename ('axiomatica c3') # er. Rename

R.expire ('c3century no. 10) # Let the data expire in 10 seconds. Honestly, I don't quite understand.

R.ttl ('c3') # see the remaining expiration time does not exist. Return-1

#--

# sequence (list) operation

Print'-'* 20

# it's two ends.

# plug in

R.push ('baked last minute')

R.push ('baked last minute hh')

# head attribute controls whether it is plugged from the other end

R.push ('breadth, memory, brain, brain, head, etc.)

# look at the length

Print 'list len:',r.llen (' b')

# list a batch

Print 'list lrange:',r.lrange (' baked Magazine startball 0 Junior endurance Murray 1)

# take out one

Print 'list index 0r.lindex (' baure0)

# trim list

# if start is greater than end, clear the list

Print 'list ltrim:', r.ltrim ('baked dagger, startball 0, endgame 3) # only have four digits from 0 to 3

# sort

# this is a big project

#--

# set operation

# plug data

R.sadd ('slots,' a')

# determine how long a set is and does not exist as 0

R.scard ('s')

# determine whether an object exists in set

R.sismember ('sails, girls and girls')

# find the intersection

R.sadd ('s 2th century, last month')

R.sinter ('s 1','1', 2')

# find the intersection and assign the result

R.sinterstore ('s 3 times, 1's, 2')

# look at a set object

R.smembers ('s3')

# Union set

R.sunion ('s 1','1', 2')

# Ah, I think you've guessed the smart one.

# join and return the result

R.sunionstore ('ss','s1','s2','s3')

# ask for difference

# numbers that are found in S1 but not in S2 and S3

R.sdiff ('s 1, 2, 7, 3, 3, 3, 4, 3, 4, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3')

R.sdiffstore ('s 4 times, 1's, 2') # you know that

# take a random number

R.srandmember ('s1')

#--

# zset ordered set

# 'zadd',' zcard', 'zincr',' zrange', 'zrangebyscore',' zrem', 'zscore'

# corresponding respectively

# add, quantity, add 1, take data, take data according to integral (range), delete, take integral

# God damn it, you're killing me, redis!

# Today in the lab, I tried to insert a piece of zset type data:

R1.zset (ubiquitous www.liyi99.composition.liwuqingphai3)

# inserted successfully

# I'll continue to insert

R1.zset (upright www.liyi99.composition.u'\ u9001\ u793 cantilethal 5)

# error:

# UnicodeDecodeError: 'ascii' codec can't decode byte 0xe4 in position 0: ordinal not in range

# what is inserted this time is the unicode coding of the Chinese word of the gift

# Why did it fail? I took this piece of data from redis and inserted it without any modification.

# the data types returned and accepted by redis are all encoded by unicode

# all right, let's try it again

# insert again

R1.zset ('www.liyi99.com',u'\ u9001\ u793 cantilever 5)

# it worked

# insert

R1.zset ('www.liyi99.com',' Gift', 5)

# still successful, follow the redis.py 1024 line

Return self.send_command ('ZADD% s% s% s\ r\ n% s\ r\ n'% (

Key, score, len (member), member))

# Oh, evil transcoding!

# but when fetching, it doesn't matter what type of data the first one is

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