HQL或Java持久性查询语言中的IN子句(IN

HQL或Java持久性查询语言中的IN子句(IN-clause in HQL or Java Persistence Query Language)

我有以下参数的JPA或Hibernate，查询：

SELECT entity FROM Entity entity WHERE name IN (?)

我想将参数作为ArrayList <String>传递，这是可能的吗？ Hibernate当前告诉我，那个

java.lang.ClassCastException: java.util.ArrayList cannot be cast to java.lang.String

这是可能的吗

解答 ：作为参数的集合只能使用诸如“ :name ”之类的命名参数，而不是像“ ? ”这样的JDBC样式参数。

I have the following parametrised JPA, or Hibernate, query:

SELECT entity FROM Entity entity WHERE name IN (?)

I want to pass the parameter as an ArrayList<String>, is this possible? Hibernate current tells me, that

java.lang.ClassCastException: java.util.ArrayList cannot be cast to java.lang.String

Is this possible at all?

ANSWER: Collections as parameters only work with named parameters like ":name", not with JDBC style parameters like "?".

最满意答案

你使用Hibernate的Query对象还是JPA？ 对于JPA，它应该正常工作：

String jpql = "from A where name in (:names)"; Query q = em.createQuery(jpql); q.setParameter("names", l);

对于Hibernate，您需要使用setParameterList：

String hql = "from A where name in (:names)"; Query q = s.createQuery(hql); q.setParameterList("names", l);

Are you using Hibernate's Query object, or JPA? For JPA, it should work fine:

String jpql = "from A where name in (:names)"; Query q = em.createQuery(jpql); q.setParameter("names", l);

For Hibernate's, you'll need to use the setParameterList:

String hql = "from A where name in (:names)"; Query q = s.createQuery(hql); q.setParameterList("names", l);