HMSET command in Redis with Ruby is common when you need to set multiple field-value pairs to a hash stored at key. It is extensively used where applications need to store and fetch data like user profiles, session information, etc., in a structured manner.
In Ruby, we use the
redis-rb gem to interact with a Redis server. Below are some examples of using the
This code connects to a local Redis server, then it uses
hmset to set two fields ('name' and 'email') with their corresponding values for the hash at key 'user:1001'.
Here, we're using the
mapped_hmset method which allows us to pass a Ruby Hash object, mapping the field names to their respective values.
Can I update the values of existing fields using HMSET? Yes, if a field already exists in the hash, its value will be updated with the new value provided.
What happens if the key does not exist when I try to use HMSET? Redis will automatically create a new hash and then set the field-value pairs.