这里制作一个引子，具体内容比较多，而且hibernate文档里的hql篇写的很详细
可以这么用：
List list = getHibernateTemplate().find(“select new map(t1.c1,t2.c3) from table1 t1 ,table2 t2 where t1.c1=t2.c2″);
这样的话list里的每个元素都是一个map，每个map里包含两个元素
注意：这里的table1和table2都是class名并不是真的表名，毕竟这是hql。除了可以用map还还支持list和自定义的bean。

//HQL-Associations
String hql = “select s.name, p.name, p.price from Product p inner join p.supplier as s”;
Query query = session.createQuery(hql);
List results = query.list();

//HQL-Delete
String hql = “delete from Product where name = :name”;
Query query = session.createQuery(hql);
query.setString(“name”,”Product 1″);
int rowCount = query.executeUpdate();

//HQL-Function
String hql = “select min(product.price), max(product.price) from Product product”;
Query query = session.createQuery(hql);
List results = query.list();

//HQL-Fetch Associations HQL Inner Join
String hql = “from Supplier s inner join fetch s.products as p”;
Query query = session.createQuery(hql);
List results = query.list();

//HQL-Named Parameters
String hql = “from Product where price > :price”;
Query query = session.createQuery(hql);
query.setDouble(“price”,2.0);
List results = query.list();
String hql = “from Product as product where product.supplier=:supplier”;
Query query = session.createQuery(hql);
query.setEntity(“supplier”,supplier);
List results = query.list();

//HQL-Update
String hql = “update Supplier set name = :newName where name = :name”;
Query query = session.createQuery(hql);
query.setString(“name”,”Supplier Name 1″);
query.setString(“newName”,”s1″);
int rowCount = query.executeUpdate();

//HQL-where
String hql = “from Product where price > 2.0 and name like ‘P%’”;
Query query = session.createQuery(hql);
List results = query.list();

//HQL-Map
String hql = ” select new map(usr.name as userName, usr.password as password) from User usr”;
Query query = session.createQuery(hql);
List list = query.list();
Map goods =(Map)list.get(0);

【注】
String hql = ” select new map(usr.name as userName, usr.password as password)　from com.jason.User usr”;
String hql = ” select new map(usr.name as userName, usr.password as password) from com.jason.User usr”;
由于from之前的空格，引起unexpected token: 　from

//select new

给一个构建函数：
public class Department(Department d, Integer employeeSize)