SADD

Add one or more members to a set. Members that already exist in the set will be ignored.

If the set does not exist, a new set containing only the added members as members is created.

Redis Native Command Syntax

SADD key member [member ...]

Parameter Description

• key: The key of the set
• member: One or more members to add

Detailed Explanation

The SADD command is used to add one or more members to a Redis set. Sets are unordered and non-repeating collections of strings, and each member is unique.

Redisun Usage

In redisun, the SADD command is implemented through the SAddCommand class and the sadd method in the Redisun class.

Basic Usage

Redisun redisun = Redisun.create(options -> {
  options.setAddress("redis://127.0.0.1:6379");
});

// Add a single member to the set
int added = redisun.sadd("myset", "member1");
System.out.println("Added members: " + added); // Output: 1

// Add multiple members to the set
added = redisun.sadd("myset", "member2", "member3");
System.out.println("Added members: " + added); // Output: 2

// Add duplicate members, only new members will be added
added = redisun.sadd("myset", "member1", "member4");
System.out.println("Added members: " + added); // Output: 1

// Asynchronous version
CompletableFuture<Integer> future = redisun.asyncSadd("myset", "member5");
future.thenAccept(count -> System.out.println("Async added members: " + count));

Notes

1. If the set does not exist, a new set will be automatically created and members will be added
2. Members that already exist in the set will be ignored and not added repeatedly
3. The command returns the number of new elements successfully added to the set
4. Each member in the set is unique, duplicates are not allowed
5. Sets are suitable for deduplication scenarios such as tags, friend lists, etc.

References

• Redis SADD Command Official Documentation