CODEWITHSUNDEEP
javaspringredisspring-data-redis
tbtrungit
tbtrungit

Reputation: 45

How to append two value to one key using Redis Spring Data

I using redis caching my project but i have a problem. I had model student and write method put it to redis.First method i write findStudent one week and put it to cache.

public void findStudentOneWeek(List<Student> students1) {
    redistemplate.opsForHash().put("Student", student.getId(), List<Customers>);
}

Second method I write findStudent one day.

public void findStudentOneDay(List<Student> students2) {
    redistemplate.opsForHash().put("Student", student.getId(), List<Customers>);
}

But i want total user from 8 day. It mean i want hold one key Student but new value equal total value method findStudentOneWeek + total value method findStudentOneDay. But i don't now how to do. I can't find method working it. I know method put from redis but it remove old value and save new value. I don't want it. I want value total.

Upvotes: 1

Views: 3117

Answers (1)

Nikolas
Nikolas

Reputation: 44398

Firstly, I assume a typo, where List<Customers> should be List<Students> student:

redistemplate.opsForHash().put("Student", student.getId(), List<Students> students);

Spring Data class HashOperations works on the similar principle as HashMap. Both allow you to get the value by the key (and the hash key in case of HashOperations). Read the current value List<Customers> and put them with a new value to the template.

List<Students> students = redistemplate.opsForHash().get("Student", student.getId());
students2.addAll(students);
redistemplate.opsForHash().put("Student", student.getId(), students2);

Upvotes: 1

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