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HQL查询

2024-07-11 09:18:27   220人阅读

hibernate中的HQL语句查询，类似于SQL;

 1 public class SearchTest { 2     public static void main(String[] args){ 3         Session session = null; 4         Transaction transaction = null; 5         try{ 6             session = HibUtil.getSession(); 7             transaction = session.beginTransaction(); 8             String hql = "from Studentinfo"; 9             Query q = session.createQuery(hql);10             List<Studentinfo> list = q.list();11             for(int i=0; i<list.size();i++){12                 Studentinfo stu = list.get(i);13                 System.out.println("Name: "+stu.getUsername());14                 System.out.println("Phone:"+stu.getUserphone());15             }16             transaction.commit();17         }catch (Exception e) {18             e.printStackTrace();19         }20         21         finally{22             if(session != null ){23                 session.close();24             }25         }26     }27 }

 

其他查询方式：

 1         //单个对象 2         String hql = "select count(*) from Studentinfo"; 3         Query q = session.createQuery(hql); 4         Number n = (Number) q.uniqueResult(); 5          6         //Object[]数组 值得到需要的属性 7         String hql = "select s.name,s.phone from Studentinfo s"; 8         List<Object[]> list = q.list(); 9         for(int i=0; i < list.size(); i++){10             Object[] os = list.get(i);11         }12         13         //实体对象14         String hql = "select new Studentinfo(s.name,s.phone) from Student s";15         //......16         17         //where子句参数传递18         //String hql = "from Studentinfo where name = ?";19         String hql = "from Studentinfo where name=:name";//参数名称动态绑定20         Query q = session.createQuery(hql);21         //q.setString(0,"smith");22         q.setString("name", "smith");23         24         //SQL查询25         String sql = "select * from studentinfo where name=:name";26         SQLQuery q = session.createSQLQuery(sql);27         //......28
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