CODEWITHSUNDEEP
pythonredis
user4170419
user4170419

Reputation:

Updating Redis hash safely

I have a hash in redis. It has 20 key/value pairs. I want to update it hourly and remove old elements. What is the best way to remove HASH key's content and fill with with fresh values. Since HASH is part of an API, I don't want to cause any race condition when I am removing all elements from the HASH. I don't want to use EXPIRE because I want to have a control over schedule.

I created following mock up. Assume that Faker() is my API that gets fresh values. I want to add new values to HASH and get rid of the old ones.

    import redis
    import json
    from faker import Faker

    try:
        r = redis.StrictRedis(host='localhost', port=6379, db=0)
        fake = Faker()
        for _ in range(20):
            userId = fake.uuid4()
            user = {"name":fake.name(),"address":fake.address(),"country":fake.country()}
            r.hset('users',userId,json.dumps(user))

    except Exception as e:
        print ('Error',e)

Upvotes: 2

Views: 2067

Answers (2)

Itamar Haber
Itamar Haber

Reputation: 49942

How about deleting the Hash with a DEL command? You can wrap it in a transaction that also sets (HSET) the new values in it.

Upvotes: 4

Tom St
Tom St

Reputation: 911

"What is the best way to remove HASH key's content and fill with with fresh values." just update it, at least if you're updating... so hset(hash, key, newvalue) or hmset(hash, newvalues_dictionary) - whats bad with this approach?

Upvotes: 0

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