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【Python之旅】第七篇（二）：Redis使用基础
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0.說明
????由于學習開發監控軟件的需要，因此需要使用到Redis，這里簡單介紹。
????注意，使用的環境為：Ubuntu 15.10
1.安裝
? ? 可以采用源碼安裝，也可以采用apt-get來安裝，都比較簡單。
2.啟動
????由于采用的是源碼安裝的方式，所以直接進入src目錄，啟動redis-server：
xpleaf@xpleaf-machine:/mnt/hgfs/Python/day7/redis-2.8.9/src$?./redis-server?
[12681]?16?Oct?00:06:52.964?#?Warning:?no?config?file?specified,?using?the?default?config.?In?order?to?specify?a?config?file?use?./redis-server?/path/to/redis.conf
[12681]?16?Oct?00:06:52.967?#?You?requested?maxclients?of?10000?requiring?at?least?10032?max?file?descriptors.
[12681]?16?Oct?00:06:52.968?#?Redis?can't?set?maximum?open?files?to?10032?because?of?OS?error:?Operation?not?permitted.
[12681]?16?Oct?00:06:52.968?#?Current?maximum?open?files?is?1024.?maxclients?has?been?reduced?to?4064?to?compensate?for?low?ulimit.?If?you?need?higher?maxclients?increase?'ulimit?-n'._._??????????????????????????????????????????????????_.-``__?''-._?????????????????????????????????????????????_.-``????`.??`_.??''-._???????????Redis?2.8.9?(00000000/0)?64?bit.-``?.-```.??```\/????_.,_?''-._???????????????????????????????????(????'??????,???????.-`??|?`,????)?????Running?in?stand?alone?mode|`-._`-...-`?__...-.``-._|'`?_.-'|?????Port:?6379|????`-._???`._????/?????_.-'????|?????PID:?12681`-._????`-._??`-./??_.-'????_.-'???????????????????????????????????|`-._`-._????`-.__.-'????_.-'_.-'|??????????????????????????????????|????`-._`-._????????_.-'_.-'????|???????????http://redis.io????????`-._????`-._`-.__.-'_.-'????_.-'???????????????????????????????????|`-._`-._????`-.__.-'????_.-'_.-'|??????????????????????????????????|????`-._`-._????????_.-'_.-'????|??????????????????????????????????`-._????`-._`-.__.-'_.-'????_.-'???????????????????????????????????`-._????`-.__.-'????_.-'???????????????????????????????????????`-._????????_.-'???????????????????????????????????????????`-.__.-'???????????????????????????????????????????????[12681]?16?Oct?00:06:52.974?#?Server?started,?Redis?version?2.8.9
[12681]?16?Oct?00:06:52.974?#?WARNING?overcommit_memory?is?set?to?0!?Background?save?may?fail?under?low?memory?condition.?To?fix?this?issue?add?'vm.overcommit_memory?=?1'?to?/etc/sysctl.conf?and?then?reboot?or?run?the?command?'sysctl?vm.overcommit_memory=1'?for?this?to?take?effect.
[12681]?16?Oct?00:06:52.976?*?DB?loaded?from?disk:?0.002?seconds
[12681]?16?Oct?00:06:52.977?*?The?server?is?now?ready?to?accept?connections?on?port?6379
????出現上面所示的提示，說明已經正常啟動了redis。
3.交互式操作
????進入src目錄，運行redis-cli即可進入redis交互界面：
xpleaf@xpleaf-machine:/mnt/hgfs/Python/day7/redis-2.8.9/src$?./redis-cli
127.0.0.1:6379>
????基本操作：
#查看幫助
127.0.0.1:6379>?help?setSET?key?value?[EX?seconds]?[PX?milliseconds]?[NX|XX]summary:?Set?the?string?value?of?a?keysince:?1.0.0group:?string#創建key-value
127.0.0.1:6379>?set?name?xpleaf
OK#獲得key對應的value
127.0.0.1:6379>?get?name
"xpleaf"#創建有時間的key-value
127.0.0.1:6379>?set?name2?CL?ex?5
OK#創建列表
127.0.0.1:6379>?lpush?stu_list?xpleaf?yonghaoye?CL
(integer)?3
127.0.0.1:6379>?lpush?stu_list?CLYYH
(integer)?4#獲取列表內容
127.0.0.1:6379>?lrange?stu_list?1?4
1)?"CL"
2)?"yonghaoye"
3)?"xpleaf"
127.0.0.1:6379>?lrange?stu_list?0?4
1)?"CLYYH"
2)?"CL"
3)?"yonghaoye"
4)?"xpleaf"#刪除key-value或其它數據類型
127.0.0.1:6379>?del?name
(integer)?1
3.在Python交互器中使用redis
apt-get?install?python-redis
>>>?import?redis
>>>?r?=?redis.Redis('127.0.0.1',?port=6379,?db=0)
#查看所有的key
>>>?r.keys()
['YourKey',?'stu_list',?'k1',?'k3']#創建key-value
>>>?r.set('xpleaf',?'xpleaf')
True#獲取key所對應的value
>>>?r['xpleaf']
'xpleaf'
或
>>>?r.get('xpleaf')
'xpleaf'#保存Python中的字典到Redis數據庫中
>>>?import?json
>>>?myDict?=?{'name':?'xpleaf',?'age':?21,?'loving':?'cl'}
>>>?r['Py_myDict']?=?json.dumps(myDict)
>>>?
>>>?r['Py_myDict']
'{"age":?21,?"name":?"xpleaf",?"loving":?"cl"}'#取出保存在Redis數據庫中的Python字典
>>>?a?=?json.loads(r['Py_myDict'])
>>>?a
{u'age':?21,?u'name':?u'xpleaf',?u'loving':?u'cl'}
>>>?a['name']
u'xpleaf'
轉載于:https://blog.51cto.com/xpleaf/1703387
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