将Hibernate结果转换为对象列表

Question

我的DAO中有一个hibernate调用,看起来像这样

List<Associate> associate = (List<Associate>)session.createSQLQuery("SELECT * FROM associates WHERE fk_id = :id AND fk_associate_id = (SELECT id FROM users WHERE fk_user_type = 2)").setParameter("id", id).list();

我收到一个错误,说我无法将结果列表强制转换为模型类型Associate.我不明白为什么会这样.我只返回关联表中的字段.

Answer 1

您需要指定结果应转换为使用的实体类addEntity(),因为您正在执行不了解实体的SQL查询:

List<Associate> associate = (List<Associate>) session.createSQLQuery(
    "SELECT * FROM associates WHERE fk_id = :id AND fk_associate_id = (SELECT id FROM users WHERE fk_user_type = 2)")
    .addEntity(Associate.class)
    .setParameter("id", id).list(); 

也可以看看:

• 18.1.2.实体查询