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“quantity”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，有可能在我的实体中添加这个值并让hibernate在加载我的实体时计算它吗？
1 个解决方案
#1
19
You an use formula annotation. for example:
你使用公式注释。例如：
@Formula("(select min(o.creation_date) from Orders o where o.customer_id = id)")
private Date firstOrderDate;
See this post: Calculated property with JPA / Hibernate
看到这篇文章：使用JPA / Hibernate计算属性
Se also Hibernate tutorial: http://docs.jboss.org/hibernate/core/3.3/reference/en/html/mapping.html#mapping-column
另请参阅Hibernate教程：http：//docs.jboss.org/hibernate/core/3.3/reference/en/html/mapping.html#mapping-column
#1
19
You an use formula annotation. for example:
你使用公式注释。例如：
@Formula("(select min(o.creation_date) from Orders o where o.customer_id = id)")
private Date firstOrderDate;
See this post: Calculated property with JPA / Hibernate
看到这篇文章：使用JPA / Hibernate计算属性
Se also Hibernate tutorial: http://docs.jboss.org/hibernate/core/3.3/reference/en/html/mapping.html#mapping-column
另请参阅Hibernate教程：http：//docs.jboss.org/hibernate/core/3.3/reference/en/html/mapping.html#mapping-column