Using RedisTemplate to Manage String and Hash Data in Spring

Encapsulating Custom Operations

Delete a single key: redisTemplate.delete(key) Delete multiple keys: redisTemplate.delete(keys) where keys is a var‑args parameter, e.g., public void deleteByKey(String ...keys) Set key expiration: redisTemplate.expire(key, time, TimeUnit.MINUTES) (parameters: key, duration, unit)

Get remaining TTL of a key: redisTemplate.getExpire(key) Check if a key exists:

redisTemplate.hasKey(key)

String Type Operations

Add cache entries

// Simple set
redisTemplate.boundValueOps("StringKey").set("StringValue");
// Set with expiration (1 minute)
redisTemplate.boundValueOps("StringKey").set("StringValue", 1, TimeUnit.MINUTES);

// Using BoundValueOperations
BoundValueOperations stringKey = redisTemplate.boundValueOps("StringKey");
stringKey.set("StringValue");
stringKey.set("StringValue", 1, TimeUnit.SECOND);

// Using ValueOperations
ValueOperations ops = redisTemplate.opsForValue();
ops.set("StringKey", "StringValue");
ops.set("StringValue", "StringValue", 1, TimeUnit.SECOND);

Delete a cache key

Boolean result = redisTemplate.delete(key);

Increment a numeric value

redisTemplate.boundValueOps("key").increment(4L); // increase by 4
redisTemplate.boundValueOps("key").increment(-4L); // decrease by 4

Hash Type Data Operations

Add a hash entry

redisTemplate.boundHashOps("HashKey").put("SmallKey", "HashValue");

BoundHashOperations hashKey = redisTemplate.boundHashOps("HashKey");
hashKey.put("SmallKey", "HashValue");

HashOperations hashOps = redisTemplate.opsForHash();
hashOps.put("HashKey", "SmallKey", "HashValue");

Set expiration for a hash key

redisTemplate.boundValueOps("HashKey").expire(1, TimeUnit.SECOND);
redisTemplate.expire("HashKey", 1, TimeUnit.SECOND);

Insert a Map into a hash

HashMap<string, string> hashMap = new HashMap<>();
redisTemplate.boundHashOps("HashKey").putAll(hashMap);

Retrieve all field keys from a hash

Set keys1 = redisTemplate.boundHashOps("HashKey").keys();

BoundHashOperations hashKey = redisTemplate.boundHashOps("HashKey");
Set keys2 = hashKey.keys();

HashOperations hashOps = redisTemplate.opsForHash();
Set keys3 = hashOps.keys("HashKey");