java - 在 hibernate 条件中使用 sum

Question

如何在 hibernate 条件中表达此查询？

select SUM (tabla2.valor1) 
  from tabla1 INNER JOIN 
       tabla2 ON tabla1.ID = tabla2.ID 
 where tabla1.ID = 1

谢谢!

Answer 1

您可以使用 Projections ，例如

getSessionFactory() //this is the session factory, initialized with->  new Configuration().configure().buildSessionFactory()
    .openSession()
    .createCriteria(tabla1.class)
    .createAlias("tabla2.id", "tab2", JoinType.INNER_JOIN)
    .setProjection(Projections.sum("tab2.valor1"));