ValueGenerator

• @GeneratorType과 ValueGenerator 조합으로 엔티티의 값(ID말고)을 원하는대로 자동 생성할 수 있다.

@Column(name = "created_by")
@GeneratorType(
    type = LoggedUserGenerator.class,
    when = GenerationTime.INSERT
)
private String createdBy;
---
// 생성기
// Hibernate session 으로 생성가능
public class LoggedUserGenerator
        implements ValueGenerator<String> {
    @Override
    public String generateValue(
            Session session, Object owner) {
        return LoggedUser.get();
    }
}

• Hibernate: How to Generate Values of Basic Entity Attributes
• How to emulate @CreatedBy and @LastModifiedBy from Spring Data using the @GeneratorType Hibernate annotation - Vlad Mihalcea
• Hibernate GeneratorType Annotation - Generating custom value for specific property or column or attribute | Greater Than 0