java，hibernate：使用查询映射属性

Question

提问by blow

I have an entity with a property "quantity", this value is not a table field but is dynamically calculated with an hql query.

我有一个属性为“数量”的实体，该值不是表字段，而是使用 hql 查询动态计算的。

So, is possibile to add this value in my entities and make hibernate calculate it when I load my entities?

那么，是否可以在我的实体中添加这个值并在我加载实体时让休眠计算它？

Answer 1

You an use formula annotation. for example:

您使用公式注释。例如：

@Formula("(select min(o.creation_date) from Orders o where o.customer_id = id)")
private Date firstOrderDate;