JPA: How to express a unique constraint including an @ElementCollection column?

Question

This is my JPA entity class:

@Cacheable
@Entity
public class JpaItemSearchRequest implements ItemSearchRequest {

    @Id
    @GeneratedValue
    private lon         


        

Answer 1

Unique constraint over columns in collection table can be defined by using @CollectionTable with element collection.

@CollectionTable(
    uniqueConstraints= @UniqueConstraint(columnNames={"col1","col2"})
)

As said, those are columns of table where element collection is mapped. There is no way to have unique constraint over columns in multiple tables.