Redis HSET is commonly used when you need to store multiple related data points, such as attributes of an object, into a single key in your Redis database. This makes access and manipulation of these related data easier and more efficient, especially in cases where the fields are frequently retrieved together.
We use Jedis, a popular Redis client for Java.
Here's how to use HSET:
// import the Jedis class import redis.clients.jedis.Jedis; public class Main { public static void main(String[] args){ // connect to redis server Jedis jedis = new Jedis("localhost"); // use HSET command jedis.hset("user:1", "name", "John Doe"); jedis.hset("user:1", "email", "john.doe@example.com"); } }
In this example, we're creating a hash with the key user:1
and setting fields (name
and email
) with corresponding values.
hsetnx
if you want to ensure that a field does not get overwritten if it already exists.Q: Can I set multiple fields at once?
A: Yes, use the hmset
method to set multiple fields at once. It accepts a Map as an argument.
Q: What if the key already exists? A: If the key already exists, the HSET command will update the value of the field, not the entire hash.
Dragonfly is fully compatible with the Redis ecosystem and requires no code changes to implement.