设置@ManyToOne或@OneToOne关系，而无需实际获取关联的实体

Question

I have entity similiar to

@Entity
@Table(name = "Template")
public class Template implements java.io.Serializable {
      Script script;

      @OneToOne(fetch = FetchType.LAZY)
      @JoinColumn(name = "SCRIPTID")
      public Script getScript() {
          return script;
      }

      public void setScript(Script script) {
          this.script= script;
      }
}

where Script is another entity.

When I want to save Template , I get id of Script from some legacy code so my saving code is:

 Long scriptId = createNewScript(....);
 Script script = commonDao.findByPrimaryKey(Script.class, scriptId); //unnecessary reading
 template.setScript(script);

 commonDao.save(template);

The problem is that I have to do unnecessary read the Script only to set it in Template . Is there any way to set only Id of script, but still have getter that returns Script .

Answer 1

Yes, there is a way.

Hibernate allows you to do something like this:

template.setScript(new Script());
template.getSCript().setId(scriptId);
commonDao.save(template);