Spring Data JPA select sequence for different bases, and set value to entity

Question

I need implement next logic:

I have entity:

@Data
@Entity
@Table(name = "USERS")
public class User {

    @Id
    @Column(name = "GUID")
    private String guid;

    @Column(name = "MESSAGE_ID")
    private String messageId;

    @Column(name = "SOME_VALUE")
    private String someValue;

And I need set to someValue generated value consisting of

"some prefix"+sequencefrom DB + "some suffix";

I can make select sequense from Db , generate vsomeValue and set it to entity, but maby Is there a way to make it easier? Because in my version I use two bases, and I have to write two native query for select a sequence and use the appropriate one depending on the profile.

I need somthig like this:

    @Column(name = "SOME_VALUE")
    @Value(MyGenerator.class)
    private String someValue;

and in MyGenerator.class implement logic for generate someValue from prefix, sequence and suffix.

Answer 1

Instead of annotating the class members, annotate the getters and setters, and put your logic there.

Further reference in this question .

Answer 2

You are looking for Custom Sequence based ID generator .

This is a nice article on it which might help you.