How to generate ID for entity from the existing ORACLE sequence?

Question

I have a Table (for a long time ago), call it TABLE_A, and I have an entity class for this Table:

@Entity
@Table(name = "TABLE_A")
public class TableA implements Serializable {
    @Id
    @Basic(optional = false)
    @Column(name = "ID")
    //what else should I write here, to get the value from the existing sequence (seq_table_a_id) from database?
    private Long id;

    @Basic(optional = false)
    @Column(name = "VALID_TO_DT")
    private String name;

    getters/setters...
}

I had created a sequence for this table in ORACLE a long time ago, and I want to give values for the new item's ID from this sequence. How should I write this code in java entity with annotations? If you could write an example for my code, that would be helpful!

And should I write anything else maybe in the persistance.xml?

The name of the existing sequence is: seq_table_a_id

Answer 1

You should check the annotation @GeneratedValue and @SequenceGenerator

@Id
@GeneratedValue(generator="seqGen")
@SequenceGenerator(name="seqGen",sequenceName="seq_table_a_id", allocationSize=1)
private Long id;

Check this link