HGET command is used in Redis to retrieve the value associated with a specified field in a hash stored at a key. A common use case for
HGET might involve storing user attributes (name, email, etc.) as fields in a hash structure with the user ID as the key.
Here's how you could use
HGET with the redis-rb library in Ruby:
In this example, we first create a new Redis instance. Then, we use
hset to add two fields ("name" and "email") to the hash identified by a
user_id. Afterwards, we use
hget to retrieve the "name" field from the hash.
hget. If the provided key doesn't exist or if it is not a hash, Redis will return a nil object. Always check for nil before trying to use the returned value.
hgeton a non-existing key?
If you try to use
hget on a non-existing key, Redis will just return nil. It won't raise an error.
Yes, you can do so using the
hmget command, which takes multiple field names and returns all their corresponding values.