如何覆盖@SequenceGenerator(name ="idGenerator"，sequenceName ="HIBERNATE_SEQUENCE"，allocationSize = 50)

问题描述

通常Id列如下，它可以很好地工作并生成序列值

Normally Id column is as follows and it works perfectly fine and generated sequence values

@Id
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "idGenerator")
@SequenceGenerator(name = "idGenerator", sequenceName = "HIBERNATE_SEQUENCE", allocationSize = 50)
@Column(name = "ID")
public Long getId()
{ return mId; }

现在我想要的是，如果在程序中设置xyz.setId(200)，它将ID保存为200而不是序列生成的ID，那么我该如何实现呢?我也想同时使用两个属性sequenceName ="HIBERNATE_SEQUENCE"，allocationSize = 50.

Now what I want is if in program I set xyz.setId(200) it should save Id as 200 instead of one generated by sequence.Now how can I acheive this? I also want to use both attributes sequenceName = "HIBERNATE_SEQUENCE", allocationSize = 50.

推荐答案

最后经过1天的使用时间，我挖了罐子，得到了解决方案.我用@GenericGenerator(name = "idGenerator", strategy = "com.jayash.domain.UseExistingOrGenerateIdGenerator")

Finally after 1 day of utilized time I digged into the jar and I got the solution.I used @GenericGenerator(name = "idGenerator", strategy = "com.jayash.domain.UseExistingOrGenerateIdGenerator")

public class UseExistingOrGenerateIdGenerator extends SequenceHiLoGenerator {
    @Override
    public Serializable generate(SessionImplementor session, Object object) throws HibernateException {
        Serializable id = session.getEntityPersister(null, object).getClassMetadata().getIdentifier(object, session);
        return id != null ? id : super.generate(session, object);
    }

    @Override
    public void configure(Type type, Properties params, Dialect dialect) throws MappingException {

        params.put(org.hibernate.id.SequenceGenerator.SEQUENCE, "HIBERNATE_SEQUENCE");


        params.put(SequenceHiLoGenerator.MAX_LO, String.valueOf("49"));

        super.configure(type, params, dialect);
    }

}

Yipee的工作很棒

And Yipee Its working great

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