SpringData Redis HashOperations Sınıfı

Giriş

Redis'te tanımlı ismi belli - örneğin "mymap" olan bir map'e key/value değerleri ekler.

- put() metodu ile nesne eklenir

- get() metodu ile nesneye erişilir

- delete() metodu ile nesne silinir

- entries() metodu ile tüm nesneler alınır

constructor
Örnek

Şöyle yaparız.

RedisTemplate<String, Object> redisTemplate = ...;
HashOperations<String, Long, Customer> hashOperations = redisTemplate.opsForHash();

Örnek

Şöyle yaparız

@Component
public class RedisUtil<T> {
    private RedisTemplate<String, T> redisTemplate;
    private ValueOperations<String, T> valueOperations;
    private ListOperations<String, T> listOperations;
    private SetOperations<String, T> setOperations;
    private HashOperations<String, Integer, T> hashOperations;

  @Autowired
  public RedisUtil(RedisTemplate<String, T> redisTemplate) {
    this.redisTemplate = redisTemplate;
    this.valueOperations = redisTemplate.opsForValue();
    this.listOperations = redisTemplate.opsForList();
    this.setOperations = redisTemplate.opsForSet();
    this.hashOperations = redisTemplate.opsForHash();
  }


  //region Hash
  public void saveHash(String key, Integer id, T value) {
    hashOperations.put(key, id, value);
  }

  public T findInHash(String key, int id) {
    return hashOperations.get(key, id);
  }

  public void deleteHash(String key, int id) {
    hashOperations.delete(key, id);
  }
  //endregion
}

Örnek

Elimizde şöyle bir kod olsun

import org.springframework.data.redis.core.RedisHash;

import javax.persistence.Id;
import java.io.Serializable;
import java.util.UUID;

@Data
@AllArgsConstructor
@NoArgsConstructor
@RedisHash("Student")
public class Student implements Serializable {

    @Id
  private String id = UUID.randomUUID().toString();
  private String name;
  ...
}

Şöyle yaparız

@Repository
public class StudentRep {

  @Autowired
  private RedisTemplate template;

  private String HASH_KEY = "Student";

  public Student addStudent(Student student){
    template.opsForHash().put(HASH_KEY, student.getId(), student);
    return student;
  }

  public Student updateStudent(Student student) {
    template.opsForHash().put(HASH_KEY, student.getId(), student);
    return student;
  }

  public List<Student> getAll(){
    return template.opsForHash().values(HASH_KEY);
  }

  public Student getStudentId(String id){
    return (Student) template.opsForHash().get(HASH_KEY,id);
  }

  public String deleteStudent(String id){
    try{
      template.opsForHash().delete(HASH_KEY, id);
      return "Student delete";
    } catch (Exception e){
      return e.toString();
    }
  }
}

delete metodu

Örnek
Şöyle yaparız.

@Override
public void delete(Long id) {
  hashOperations.delete(KEY, id);
}

entries metodu
Örnek
Şöyle yaparız.

public final String key = "USER";

@Override
public Map findAll() {
  return hashOperations.entries(key);
}

get metodu
Örnek
Şöyle yaparız.

@Override
public Customer find(Long id) {
  return hashOperations.get(KEY, id);
}

put metodu

Örnek

Şöyle yaparız. RedisTemplate'in varsayılan davranışı JDK native serialization kullanmak. Bunun yerine nesneyi kendimiz json'a çeviriyoruz

TenantDatasource tenantDatasource = ...;
Map ruleHash = new ObjectMapper().convertValue(tenantDatasource, Map.class);
redisTemplate.opsForHash().put("multitenancy", "bd_tenant_a", ruleHash);

Okumak için şöyle yaparız

List<Map<String, Object>> datasourceConfigList = redisTemplate.opsForHash()
  .values("multitenancy");

Örnek
Şöyle yaparız.

public final String key = "USER";


@Override
public void save(User user) {
  hashOperations.put(key,user.getId(),user);
}

@Override
public void update(User user) {
  hashOperations.put(key,user.getId(),user);
}