HQL查询

hibernate中的HQL语句查询，类似于SQL;

public class SearchTest {
    public static void main(String[] args){
        Session session = null;
        Transaction transaction = null;
        try{
            session = HibUtil.getSession();
            transaction = session.beginTransaction();
            String hql = "from Studentinfo";
            Query q = session.createQuery(hql);
            List<Studentinfo> list = q.list();
            for(int i=0; i<list.size();i++){
                Studentinfo stu = list.get(i);
                System.out.println("Name: "+stu.getUsername());
                System.out.println("Phone:"+stu.getUserphone());
            }
            transaction.commit();
        }catch (Exception e) {
            e.printStackTrace();
        }
        
        finally{
            if(session != null ){
                session.close();
            }
        }
    }
}    

其他查询方式：

        //单个对象
        String hql = "select count(*) from Studentinfo";
        Query q = session.createQuery(hql);
        Number n = (Number) q.uniqueResult();
        
        //Object[]数组 值得到需要的属性
        String hql = "select s.name,s.phone from Studentinfo s";
        List<Object[]> list = q.list();
        for(int i=0; i < list.size(); i++){
            Object[] os = list.get(i);
        }
        
        //实体对象
        String hql = "select new Studentinfo(s.name,s.phone) from Student s";
        //......
        
        //where子句参数传递
        //String hql = "from Studentinfo where name = ?";
        String hql = "from Studentinfo where name=:name";//参数名称动态绑定
        Query q = session.createQuery(hql);
        //q.setString(0,"smith");
        q.setString("name", "smith");
        
        //SQL查询
        String sql = "select * from studentinfo where name=:name";
        SQLQuery q = session.createSQLQuery(sql);
        //......