spring data redis use #RedisHash to generate hash then retrieve its fields - spring-data-redis

Question

friends! I want to retrieve only a field of a hash from redis database using spring RedisTemplate, but it does not work. Because I think it is reasonable to do it since #RedisHash makes the object a hash table in Redis, I have tried to retrieve or update part of the hash, but don't know why it does not work:
This is the entity I use:
#Data
#RedisHash("arithmetic_gamestats")
public class GameStats {
/**
* Used for redis serialization
*/
public GameStats() {}
public GameStats(long userId, int score) {
this.userId = userId;
this.score = score;
}
public GameStats(long userId, int score, List<Badge> badges) {
this.userId = userId;
this.score = score;
this.badges = badges;
}
#Id
private Long userId;
private int score;
private List<Badge> badg/es;
}
// this is my test, first I create a new object, and save it to redis, this works totally fine:
//#Test #Order(5)
public void testRedisHashtable() {
long userId = userIds.get(random.nextInt(0, userIds.size()));
GameStats gameStats = new GameStats(userId, 1000);
GameStats dbGameStats = gamestatsRepository.save(gameStats);
assertThat(dbGameStats).isNotNull();
}
After insert one instance of the GameStats class in the test method, I get the following result in Redis server which is what I expected:
127.0.0.1:6379> keys *
1) "arithmetic_gamestats"
2) "arithmetic_gamestats:-5461129489864155017"
127.0.0.1:6379> type "arithmetic_gamestats"
set
127.0.0.1:6379> type "arithmetic_gamestats:-5461129489864155017"
hash
127.0.0.1:6379> smembers "arithmetic_gamestats"
1) "-5461129489864155017"
127.0.0.1:6379> hgetall "arithmetic_gamestats:-5461129489864155017"
1) "_class"
2) "com.worldexplorer.arithmeticgamification.entity.GameStats"
3) "score"
4) "1000"
5) "userId"
6) "-5461129489864155017"
127.0.0.1:6379> hget "arithmetic_gamestats:-5461129489864155017" "score"
"1000"
I copy the key from redis to retrieve the data, but the result is null, or empty:
#Test #Order(6)
public void testRedisHash() {
String key = "arithmetic_gamestats:-5461129489864155017";
Object scoreObject = redisTemplate.opsForHash().get(key, "score");
System.out.println("score = " + scoreObject);
Set<Object> keySet = redisTemplate.opsForHash().keys(key);
for (Object object : keySet) {
System.out.println("key = " + object);
}
Map<Object, Object> keyvalueMap = redisTemplate.opsForHash().entries(key);
for (Map.Entry<Object, Object> entry : keyvalueMap.entrySet()) {
System.out.println("key-value = " + entry.getKey() + "-" + entry.getValue());
}
System.out.println("keySet = " + keySet);
System.out.println("keyvalueMap = " + keyvalueMap);
}
This is the result printed in the console:
score = null
keySet = []
keyvalueMap = {}
And here is the repository:
public interface GamestatsRepository extends CrudRepository<GameStats, Long>{
}