HVALS command in Redis is commonly used when you want to retrieve all the values in a hash key. In Node.js using Node Redis, this can be particularly useful when you need to process or analyze the data associated with a hash key without necessarily knowing or caring about the corresponding field names.
Suppose we have a hash key
user:1001, representing a user in our application with various attributes stored as fields. If we want to fetch all the values of these fields, we would use HVALS.
Here's a basic example:
In this example, 'values' will be an array containing all the values stored in the hash of 'user:1001'. We connect to Redis, then execute the
hvals command on the
HVALSjudiciously for larger hashes. This operation can be expensive for large hashes, as it returns all values stored in the hash.
HGETALL. But remember,
HVALSonly returns the values in the hash, while
HGETALLreturns all fields and their respective values.
1. What if the hash key does not exist?
If the hash key does not exist,
HVALS will return an empty list.
2. Can I get all fields and values together using HVALS?
HVALS only fetches the values. If you need both fields and values, use