hibernate 多表查询

    public List dzcx(Object a) {
        try{
            
            //Query p=getSession().createQuery("PersonInf where name=:name ");
            Query p=getSession().createQuery("select p.name,p.age,a.addressDetail from PersonInf as p" +
                    " inner join p.addressInfs as a" +
                    " where a.addressDetail=:a" );
            //要加上select就要加上别名
            //多个表之间查询加上   inner join
            p.setParameter("a", a);
            return    p.list();
        }
        catch(RuntimeException e)
        {
            log.error("find Name failed", e);
            throw e;
        }

select p.name,p.age,a.addressDetail from PersonInf as p inner join p.addressInfs as a where a.addressDetail=:a 

这里是根据地址查询，显示名字、年龄、地址。 inner join  自动连接中间表，根据p.addressInfs 找到addressInf表。

调用查询：

<%

 PersonInfDAO p=new PersonInfDAO();

List a=p.dzcx("垫江");

Iterator it=a.iterator();

while(it.hasNext()){

 Object[] pit=(Object[])it.next();//注意如果返回的是一个值，而不是一个数组，那么这里就应该是Object pit=(Object)it.next();

out.print(pit[0]);

out.print(pit[1]);

out.print(pit[2]);

}

%>