java - JPA 查询子句 Where

Question

在JPA中应该如何进行这样的查询

"SELECT t FROM persona t WHERE t.value1 = :value1 AND t.value2 = :value2"

我已经定义了 EntintyManager:

EntityManagerFactory factory = Persistence.createEntityManagerFactory("persona"); 
EntityManager em = factory.createEntityManager();

想要返回 1 个对象类型 Persona 与我用于映射的类相同

应该怎样？

Answer 1

TypedQuery<Persona> q = em.createQuery("SELECT t FROM persona t WHERE t.value1 = :value1 AND t.value2 = :value2", Persona.class);
Persona result = q.setParameter("value1", val1)
                  .setParameter("value2", val2)
                  .setMaxResults(1)
                  .getSingleResult();