Person类中包含有MyEvent这个类 

public class Person{private Long id;private String name;private MyEvent myEvent;
}

一、HQL from语句 

1、结果类型：List<Person>

from Person  或者 from Person as p

from Person as p where p.myEvent.title = :title

注意：hibernate3.2.3之前总是对的。 hibernate3.2.3之后如果myEvent是普通属性或关联的实体也是对的，如果myEvent是一个集合会出异常 因此hibernate推荐使用下面的方式：

select p from Person as p inner join p.myEvent as e where e.title = :title

2、结果类型 List<Person,Event>

from Person as p inner join p.myEvent as event where event.title = : title

注：查询出来是：是一个集合，集合元素是Person,myEvent组成的数组。 结果类型： List<Person,Event> 

from Person as p left outer join p.myEvent as event where event.title = : title

注意：查询出来是：是一个集合，集合元素是Person,myEvent组成的数组。 
           结果类型： List<Person,Event>

from Person as p right outer join p.myEvent as event where event.title = : title

from Person as p full join p.myEvent as event where event.title = : title

第二：HQL select语句 

1、结果类型:  List<String> 

select p.name from Person as p

2、结果类型：List<Object[String,Person]>

select p.name,p from Person as p

3、结果类型：List<String,String>

select new List(p.name,p.address) from Person as p

4、结果类型：List<ClassTest>

select new ClassTest(p.name,p.address) from Person as p

   注意：前提ClassTest 类有两个参数的构造器。 

5、结果类型：List<map<String,String>>

select new map(p.name as personName) from Person as p