HSTRLEN command is used to get the length of the value of a hash field stored at key. It returns the string length of the value associated with field in the hash stored at key. In Python, using the redis-py client, we can use this command as
Common use cases include:
Let's consider that we have a hash representing a user object stored in Redis with 'user_id' as the key and a dictionary as the value.
In this example, first we connected to our local Redis server. We then created a hash with the key 'user:1001' and a dictionary with "name" and "email" fields as the value. Afterwards, we used
hstrlen command to get the length of the email field in our hash.
hstrlencommand to avoid errors.
hgetto reduce memory usage when you only need the length of a field.
hstrlenwill return 0 if the key or the field does not exist.
hgetand then calculating string length in Python when you only need the string length. This can consume a lot of memory for large strings. Instead, use
What happens if the key or field does not exist?
hstrlencommand will return 0 if the key or the field does not exist.
Can I use
hstrlen for any data type in Redis?
hstrlenis specifically designed for hash fields. For other data types, you might need different commands.