asked on

Concern with JPA issue

while defining a Base Model of teh database is it necessary to define

private Map<String, Object> objectMap = new HashMap<String, Object>();

is this correct to define <String ,Object> or any other way so that future it may not trouble in the code.Let us me know expert as this is important we are doing a college project

@JsonSerialize(using = DefaultSerializer.class)
@MappedSuperclass
public abstract class BaseModel extends Convertable {

      @Id
      @Column(name="id")
      @GeneratedValue(strategy=GenerationType.IDENTITY)
      private int id;

      // dis is used to create teh Json view of current object
      @Transient
      private Map<String, Object> objectMap = new HashMap<String, Object>();

      public Map<String, Object> getObjectMap() {
            return objectMap;
      }

      public int getId() {
            return id;
      }

      @Column(updatable = false)
      @CreationTimestamp
      private LocalDateTime created = LocalDateTime.now();

      @UpdateTimestamp
      private LocalDateTime lastModified;

      public LocalDateTime getCreated() {
            return created;
      }

      public void setCreated(LocalDateTime date) {
            created = date;
      }

      public LocalDateTime getLastModified() {
            return lastModified;
      }

      @Override
      public void buildObjectMap() {
            objectMap.put("id", String.valueOf(id));
      }

      @Override
      public String toJSONString() {
            buildObjectMap();
            GsonBuilder builder = new GsonBuilder();
            Gson gson = builder.create();
            return gson.toJson(objectMap, Map.class);
      }

      @Override
      public Map<String, Object> toJsonizedMap() {
            buildObjectMap();
            return objectMap;
      }

}

Sathish David Kumar N

better you can create POJO class and use of instant of object

roy_sanu

ASKER

Satish Expert,
I like know if do in pojo what changes I should make this class as we want data should data with two database and we want data is in json as of now.if you can create some class skeleton let us know.Another way is working on database is easy for me but using jpa based relationship is bit difficult for me.if you better way represent let me know.by the way Cassandra non sql database is being used so what i feel object should object i guess, is it possible to use object calling string in the future so that load on Cassandra database would be less.

roy_sanu

ASKER

What I mean calling objects should be calling object as a mapper, As you are an architect if you can put some light on if object needs to be shared by other database will it be a problem in the future or not. Calling object in a class but calling a class from a object may not be right.

Thanx expert Satish sir.any update let us know
Daisy Roy.

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