HGETALL command in Redis is used to retrieve all the fields and their corresponding values of a hash stored at a specific key. Common use cases include:
In Golang, you can interact with Redis using the
go-redis package. Below are examples of how to use the
In this example, we first create a hash with the
HSET command. The hash is at key
user:1001 and has two fields,
age, with corresponding values
30. We then retrieve all fields and their values using the
HGETALL. If the key does not exist, Redis will return an empty list or set.
HGETALLretrieves all keys in a Redis instance. It actually retrieves all fields and their values for a given hash key.
HGETALLon large hash instances can lead to blocking operations and impact performance. Consider using
HSCANif you only need part of the fields.
Q: What happens if the key does not exist in Redis when I call HGETALL? A: Redis will return an empty list or set.
Q: What is the time complexity of the HGETALL command in Redis? A: The time complexity is O(N) where N is the size of the hash.