Spring Data JPA - Is it possible to sort on a calculated property?

Question

Suppose you have the following Entity:

@Entity
public class Game {

    @Id
    @GeneratedValue
    private Integer id;

    private String name;

    privat         


        

Answer 1

Use annotation @Formula

Example: tickePrice = totalAmount / admissions

@Entity
public class Event {
...
   // To avoid division by 0, and setting to 0 if admissions is 0 
   @Formula(value = "coalesce(totalAmount / NULLIF(admissions, 0), 0)")
   private Double ticketPrice;
}

To sort by this column is required to be present as a column result.

GET example-url?size=25&page=0&sort=ticketPrice,ASC

Answer 2

The problem is that Spring Data's PageRequest sort is done on the database layer by forming the ORDER BY clause.

You could create a @Formula column, e.g.

@Entity
public class Game {
...
     // rewrite your logic here in HQL
     @Formula("case when startTime >= endTime then 'FINISHED' ... end")
     private String status;

Then it will be possible to use the new column in sort order as everything you write in the formula will be passed to ORDER BY clause.