Retrieve data from Redis set

Question

I have stored some data in Redis using Jedis. Now I want to retrieve set values if the key exists in the set. I'm using get function but I end up getting this error:

WRONGTYPE Operation against a key holding the wrong kind of value.

String str = jedis.get(word);

To store data I have serialized my Node class using toString function.

jedis.sadd(word, toString(node));

node is an instance of Node class.

What code u used to store the data?

Ankur
– Ankur

2018-03-03 08:24:53 +00:00
Commented Mar 3, 2018 at 8:24 — Ankur
– Ankur, Commented Mar 3, 2018 at 8:24
@Ankur updated the question

Cyber
– Cyber

2018-03-03 08:26:07 +00:00
Commented Mar 3, 2018 at 8:26 — Cyber
– Cyber, Commented Mar 3, 2018 at 8:26

Ankur · Accepted Answer · 2018-03-03 13:14:15Z

1

You are creating a set in redis hence you need to use set related functions like smembers.

OR

You should be using set instead of sadd and then use get to read the value back.

edited Mar 3, 2018 at 13:14

answered Mar 3, 2018 at 8:29

Ankur

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2 Comments

Cyber Over a year ago

smembers returns a set but I guess the value should be a String!

Ankur Over a year ago

@Cyber: Then you should not use sadd. Use set and then use get.

Muthu · Accepted Answer · 2018-03-03 09:03:42Z

0

step 1 : You need to autowired redish

@Autowired
private RedisTemplate<String, Test> redisTemplate;

step 2 : KEY -> your key value for redis. ex. Your class name "Test" , 
testObj.id --> id of your obj and testObj --> your object

redisTemplate.opsForHash().put(KEY, testObj.id, testObj);

step 3 :  get Your object from redis. your key and object id. if you are 
need all object means

get single obj --> redisTemplate.opsForHash().get(KEY, id);

get need all object means  Map<Object, Object> obj=

redisTemplate.opsForHash().entries(KEY);

answered Mar 3, 2018 at 9:03

Muthu

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1 Comment

Cyber Over a year ago

Why would I need to use Spring?

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