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, Sep 25 '14 at 08:18

kmak · Accepted Answer · 2015-05-07T21:53:44.567

30

Try the SCAN command like this :

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

edited May 07 '15 at 21:53

answered May 07 '15 at 19:58

kmak

708
7
13

Thomas John · Answer 2 · 2018-01-31T05:16:12.653

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?

Redis scan command match option does not work in Python

2 Answers2

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