HVALS command in Redis is used to retrieve all the values in a hash stored at a specific key. This is useful in scenarios where you need just the values without the associated fields, especially when working with semi-structured data.
Here's an example of how you might use the HVALS command in Python with the redis-py library.
In this example, we first establish a connection to the Redis server. We then add two fields ("field1" and "field2") with corresponding values ("value1" and "value2") to the hash stored at key "myhash". The
hvals method is then used to retrieve all the values from the hash, and it returns a list of the values.
HVALSmatches the order of the fields as they were inserted.
HVALScan have significant performance implications on large hash objects as it's a blocking operation.
HVALSon a key that has non-hash data type will return an error. Always ensure that the key holds hash data before using
HVALS. This leads to error or None type return. Always check if key exists before using
What are the differences between HGETALL and HVALS?
HGETALL returns all fields and values of the hash stored at the key, while
HVALS only returns the values.
What happens when HVALS is used on an empty hash or a non-existing key?
It returns an empty list in both cases.