get latest record from table using postgresql

Question

I have table employee as below,

id|name1|number
--|-----|------
01|test |100
02|test1|101
03|test2|102 

I am using jpa with eclipselink implementation and database is postgresql. Here my requirement is I want to get latest record using select query. Can anyone suggest the query to get latest record always. Thanks,

Answer 1

You must add updatedDate field in the entity class.

So I'll like to know if is there a SIMPLE way around my problem, meaning having @PrePersist or @PreUpdate or even other workaround to set the lastModified field still using session

Entity Class:

@Entity
@Table(name = "employee")
public class Employee {

    @Id
    @GeneratedValue
    private Long id;


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

    @Column(name = "number")  
    private Long number;

    @Column(name = "updated_at")  
    @Temporal(TemporalType.TIMESTAMP)  
    private Date updatedAt;  

    // getter setter

    @PreUpdate  
    public void setChangeDate() {  
       this.updatedAt = new Date();  
    }  

}

You can use JPA query. This exam:

String query = "SELECT emp FROM Employee emp order by updatedAt desc limit 1 ";