python-redisRedis watch example
Pipelines use transactions by default, so we have to watch() our key from pipeline:
r = redis.Redis()
val = r.get('some_counter')
p = r.pipeline()
p.watch('some_counter')
p.set('some_counter', val + 10)
p.execute()ctrl + credis.Redisconnect to Redis server | r.get('some_counter')get value of some key from Redis (assume it has numeric value stored in it already) |
r.pipeline()create Redis pipeline to execute batch commands | p.watchwatch specified key within pipeline transaction |
p.setset key value within pipeline | p.execute()execute pipeline |
Usage example
import redis, time
r = redis.Redis()
val = r.get('some_counter')
p = r.pipeline()
p.watch('some_counter')
time.sleep(10)
p.set('some_counter', val + 10)
p.execute()output
Traceback (most recent call last):
...
redis.exceptions.WatchError: Watched variable changed.
More of Python Redis
- Set expiration (TTL) for Redis key
- Clear all keys in Redis
- Count keys in Redis
- Delete key in Redis
- Get JSON from Redis
- Redis zadd example - adds element to sorted set
- Decode bytes obtained from Redis to string
- Get list (all elements) from Redis
- Iterate through Redis keys
- Search keys by pattern in Redis
See more codes...