hibernate in 查询-优快云博客

本文链接：https://blog.youkuaiyun.com/pyzheng/article/details/84464517

本文介绍了在Hibernate中使用IN查询的正确方式。通过对比两种不同的实现方法，指出了一种常见的错误做法，并给出了正确的实现方案。

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[url]http://blog.youkuaiyun.com/tanggoodboy/article/details/4161679[/url]
在hibernate 查询in 查询中不能使用testQuery1方法查询

public void testQuery1(){
        SessionFactory factory = null;
        Session session = null;
        factory = (SessionFactory) HibernateSessionFactory.getSessionFactory();
        session = factory.openSession();

        Integer id[] = new Integer[]{1,2,3,4};


        String hql = "from Group as p where p.id in (?)";
        Query query = session.createQuery(hql);
        query.setParameter(1, id);


        List list = query.list();
        System.out.println(list.size());
        session.close();
    }

应该使用如下方法：

    public void testQuery2(){
        SessionFactory factory = null;
        Session session = null;
        factory = (SessionFactory) HibernateSessionFactory.getSessionFactory();
        session = factory.openSession();
        Integer id[] = new Integer[]{1,2,3,4};


        String hql = "from Group as p where p.id in (:test)";
        Query query = session.createQuery(hql);
        query.setParameterList("test", id);


        List list = query.list();
        System.out.println(list.size());
        session.close();
    }

[color=red]Integer id[] [/color]= new Integer[]{1,2,3,4};
String hql = "from Group as p where p.id in (:test)";
Query query = session.createQuery(hql);
query.[color=red]setParameterList[/color]("test", id);

两者的区别之处在蓝色字体部分。