Redis scan command match option does not work in Python

Question

I use python redis to match some infomation by using match option? but it doesn't work.

 import redis
 import REDIS

 class UserCache(object):
    def __init__(self):
       self.rds = self._connectRds() 

    def _connectRds(self):
        _db = REDIS['usercache']
        pool = redis.ConnectionPool(host=_db['HOST'], port= _db['PORT'], db=_db['DB'])
        rds = redis.Redis(connection_pool=pool) 
        return rds 

 cache = UserCahce()
 cache.rds.execute("scan", "0", match="userinfo_*")

It seems that match option does work in scan command.

In [68]: cache.rds.execute_command("scan", "0", match="userinfo_*") Out[68]: ['28', ['user_dev_20199116', 'devinfo_af85d776fcc9dbc56e3cca16594e1c9ec36fecd10000000001', 'devinfo_dd552211d1b97a825c416aaaf3c62ce8ce4661820000000002', 'user_dev_2', 'userinfo_20130243', 'session_r4XXdvzJ28VuPMoWWU4cnsNv7NEAAAAAAQ==', 'devinfo_35372afae1de3dbf6a213f659c2814c7b1767f2400013436cc', 'session_3IaTKySREBKjMTAi1puQSwzO20wAAAAAAQ==', 'session_3VUiEdG5eoJcQWqq88Ys6M5GYYIAAAAAAg==', 'user_dev_20130243']]

I scan the userinfo, check it by starting with "userinfo", and solve the problem. — zebo zhuang
– zebo zhuang, Commented Sep 25, 2014 at 8:18

kmak · Accepted Answer · 2015-05-07 21:53:44Z

31

Try the SCAN command like this :

r = Redis(....) #redis url
for user in r.scan_iter(match='userinfo_*'):
  print(user)

edited May 7, 2015 at 21:53

answered May 7, 2015 at 19:58

kmak

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Comments

Thomas John · Accepted Answer · 2018-01-31 05:16:12Z

0

hscan seems much quicker than scan, better use hscan, only if you are sure about the key, if you need to search all keys then use scan

for name in r.hscan_iter('live_AP_460000','name'):
   print(name) #for a single child key

for hash in r.hscan_iter('live_AP_460000'):
   print(hash) #for all child keys

hscan is quicker than scan, only if you are searching for a correct key, else to fetch all keys with some similar pattern, go for scan. For reference. How to search a key pattern in redis hash?

edited Jan 31, 2018 at 5:16

answered Jan 31, 2018 at 5:10

Thomas John

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