====== ValueGenerator ======
  * [[https://docs.jboss.org/hibernate/orm/6.0/javadocs/org/hibernate/annotations/GeneratorType.html|@GeneratorType]]과 [[https://docs.jboss.org/hibernate/orm/6.0/javadocs/org/hibernate/tuple/ValueGenerator.html|ValueGenerator ]] 조합으로 엔티티의 값(ID말고)을 원하는대로 자동 생성할 수 있다.


===== Example =====
<code java>
@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();
    }
}

</code>

===== 참조 =====
  * [[https://youtu.be/gkh1oojif60|Hibernate: How to Generate Values of Basic Entity Attributes
]]
  * [[https://vladmihalcea.com/how-to-emulate-createdby-and-lastmodifiedby-from-spring-data-using-the-generatortype-hibernate-annotation/|How to emulate @CreatedBy and @LastModifiedBy from Spring Data using the @GeneratorType Hibernate annotation - Vlad Mihalcea]]
  * [[https://www.greaterthan0.com/hibernate-generatortype-annotation-generating-custom-value-specific-property-or-column-or-attribute|Hibernate GeneratorType Annotation - Generating custom value for specific property or column or attribute | Greater Than 0]]