Redis HGET in Java (Detailed Guide w/ Code Examples)

Use Case(s)

Redis HGET is a command used to fetch the value associated with a specific field from a hash stored at a given key. In Java with Jedis, an essential use case for HGET could be when you need to access individual fields of a hash structure, for example, retrieving specific user information in a user profile scenario.

Code Examples

Here's an example of how to use the HGET command using Jedis, a popular Java client for Redis:

import redis.clients.jedis.Jedis; public class Main { public static void main(String[] args) { Jedis jedis = new Jedis("localhost"); // Set some fields in a hash jedis.hset("user:1", "name", "John Doe"); jedis.hset("user:1", "email", ""); // Get a specific field from the hash String name = jedis.hget("user:1", "name"); System.out.println(name); // prints "John Doe" } }

In this example, we first connect to the local Redis server using Jedis, then we set two fields (name and email) in a hash at the key "user:1". We then use HGET to retrieve the name field from the hash.

Best Practices

  • For larger applications or services it's recommended to use connection pooling for Jedis, as creating a new connection for each command can be expensive.
  • Remember to close your Jedis instances when they are not in use to free up resources.

Common Mistakes

  • A common mistake is trying to access a key that does not exist or is not a hash type. Always ensure that the key you are accessing points to a hash.
  • Forgetting to close Jedis instances after use which might lead to resource leaks.


Q: What happens if I use HGET on a field that doesn't exist in the hash? A: Redis will return a nil response (which translates to null in Java).

Q: Can I use HGET to fetch multiple fields from the hash at once? A: No, HGET retrieves a single field. If you need to get multiple fields simultaneously, consider using HMGET.

Was this content helpful?

Start building today

Dragonfly is fully compatible with the Redis ecosystem and requires no code changes to implement.