List arr=null; try { String hql=”from Stu”; Query query=this.GetSession().createQuery...// Query query=this.GetSession().createQuery(“from Stu where SName=:name”); // query.setString...(“name”, name); //或者 Query query=this.GetSession().createQuery(“from Stu where SName=...try { String hql=”select s.SName from Stu as s”; Query query=this.GetSession().createQuery...; Query query=this.GetSession().createQuery(hql); query.setInteger(0, s_id);
HQL查询 hql基本查询 单属性和多属性查询 List list = session.createQuery("select name,code from Province").....get(i)+"========"); } System.out.println(list1); 别名使用 List list = session.createQuery...list) { System.out.println(province); } List list = session.createQuery...设置条件参数的名称 以冒号开头后更名称 设置参数时 只需指定名 setInterger(0,4)跟setParameter(0,4)效果一样 List list = session.createQuery...select c from City c inner join c.province d where d.name=:name"; List list = session.createQuery
1.最简单的查询 List specials = (List)session.createQuery("select spe from Special spe").list...xxx 通过setParameter来设置别名 */ List students = (List)session.createQuery...* 如果得到的值只有一个,则可以使用uniqueResult方法 */ Long stu = (Long)session.createQuery...形式的查询必须放在别名前面 */ // List stus = (List)session.createQuery("...可以设置分页查询,相当于offset和pagesize */ List stus = (List)session.createQuery
String hql = "from News"; Query query = session.createQuery(hql); List list = query.list(); for...String hql = "from News"; Query query = session.createQuery(hql); //设置截取的起始下标 query.setFirstResult(2)...String hql = "from News where author like '%三%'"; Query query = session.createQuery(hql); List...String hql = "from News order by createTime desc"; Query query = session.createQuery(hql); List...String hql = "from News group by author"; Query query = session.createQuery(hql); List list = (
(o)) } 上面例子的createQuery使用参数o 的ordId和customerId字段创建SQL。...为了说明问题,简单起见,我们假定createQuery函数只处理包含string 和 int 类型字段的结构体。...编写这个createQuery函数的唯一方法是检查在运行时传递给它的参数的类型,找到它的字段,然后创建SQL。这里就是需要反射发挥用的地方啦。...我们的createQuery函数接收到一个interface{}类型的实参后,需要根据这个实参的底层类型和值去创建并返回INSERT语句,这正是反射包的作用所在。...用反射搞一个SQL生成器 上面我们已经了解完写这个SQL生成器函数前所有的必备知识点啦,接下来就把他们串起来,加工完成createQuery函数。
通过session.createQuery(),用于接收一个HQL进行查询方式。...简单查询 //查询整个表:createQuery("from 类名 (别名)") Query query = session.createQuery("from Course"); List courses = query.list(); for (Course c : courses) { System.out.println(c); } 排序查询 //以整型属性排序:createQuery...("from 类名 order by 属性 desc ") Query query = session.createQuery("from Course order by course_id desc...("select 类名(别称).属性 from 类名 (别称)") Query query = session.createQuery("select c.course_id from Course c
private Classroom room; .......... } 1.最简单的查询 List specials = (List)session.createQuery...xxx 通过setParameter来设置别名 */ List students = (List)session.createQuery...形式的查询必须放在别名前面 */ // List stus = (List)session.createQuery("...; 79 List list2 = session.createQuery(hql)// 80 .setParameter(0, 5)// 设置参数,第1个参数的索引为0。...103 // >> Delete 104 int result1 = session.createQuery(// 105 "DELETE FROM Employee e WHERE id
("from Customer"); List list = query.list();*/ List list = session.createQuery("from...("from Customer as c").list(); // List list = session.createQuery("from Customer c").list()...; List list = session.createQuery("select c from Customer c").list(); for (Customer customer...Listlist = session.createQuery("from java.lang.Object").list(); System.out.println(list); tx.commit()...("from Customer order by age asc").list(); List list = session.createQuery("from Customer order
查询全部列 // Query q = session.createQuery("from Dept"); //OK // Query q = session.createQuery("select *...查询指定的列 【返回对象数据Object[] 】 // Query q = session.createQuery("select d.deptId,d.deptName from Dept d");...查询指定的列, 自动封装为对象 【必须要提供带参数构造器】 // Query q = session.createQuery("select new Dept(d.deptId,d.deptName)...条件查询: 一个条件/多个条件and or/between and/模糊查询 // 条件查询: 占位符 // Query q = session.createQuery("from Dept d where...d.emps"); //3) 右外连接 Query q = session.createQuery("from Employee e right join e.dept"); q.list();
hibernate查询方式之:HQL查询方式: HQL语句正对的是实体类的名称和实体类的属性进行操作 1.查询所有 格式:from 实体类名称 Query query = session.createQuery...; Query query = session .createQuery(“from User u where u.name=? and u.id=?”); //给?...; Query query = session.createQuery(“from User u where u.name like ?)...排序查询 使用关键字 order by 格式:from 实体类名称 order by 实体类属性名称 asc/desc //asc:升序 ;desc:降序 Query query = session.createQuery...//先查询所有 Query query = session.createQuery(“from User”); //设置开始查询位置 query.setFirstResult(0);
select new Map(u.id as id,u.username as name) from User as u"); //可以把as省略 //Query query=session.createQuery...{ System.out.println(user.getId()+user.getUsername()); } //投影查询 中使用where子句 query=session.createQuery...listlike){ System.out.println(user.getId()+user.getUsername()); } //null查询 query=session.createQuery...:listnull){ System.out.println(user.getId()+user.getUsername()); } //and查询 query=session.createQuery...//query.setInteger(0,2) //query.setString(0,"Hongten") query=session.createQuery("select username
; String hql=”update User user set user.age=20 where user.age=18”; Query queryupdate=session.createQuery...queryupdate.executeUpdate(); trans.commit(); 四 查询 1 String sql_0 = "from Teacher s"; List listTea = createQuery...(sql_0).list(); 2 List list=session.createQuery(“select user.name from User user ”).list(); for(int... i=0){ System.out.println(list.get(i)); } 五 查询通用语句 public Query createQuery(String queryString, Object...... values) { Query query = getSession().createQuery(queryString); if (values !
根据某个对象导航查询与该对象关联的对象数据 HQL检索:通过query接口对象查询 QBC检索:通过criteria接口对象查询 SQL检索:通过SQL语句查询 2、HQL检索方式: 查询全部数据:session.createQuery...("from 类名"); 根据条件查询:session.createQuery("from 类名 where 属性名=?")....号索引(从0开始),条件); 分页查询:Query query = session.createQuery("from 类名");-----query.setFirstResult(起始索引);----...query.setMaxResults(每页显示的记录数); 统计查询:session.createQuery("select count(*) from 类名").uniqueResult(); 投影查询...(就是查询某个字段或某部分字段):session.createQuery("select 属性名1,属性名2 from 类名"); 别名查询:session.createQuery("select 别名
query1(){ Session session = HibernateSessionFactory.getSession(); Query query = session.createQuery...; Session session = HibernateSessionFactory.getSession(); Query query = session.createQuery("from...cus.name=:name”; Session session = HibernateSessionFactory.getSession(); Query query = session.createQuery...的方式传递参数 Query query = session.createQuery("SELECT s.id, s.name FROM Student s WHERE s.name LIKE ?")...; Query query = session.createQuery("SELECT s.id, s.name FROM Student s WHERE s.name LIKE :myname");
HQL查询可以通过以下方式执行:创建Query对象:您可以通过使用org.hibernate.Session接口提供的createQuery方法创建一个HQL查询对象。...例如:String hql = "FROM Product WHERE price > :price";Query query = session.createQuery(hql);query.setParameter...例如:String hql = "FROM Product WHERE price > :price ORDER BY price DESC";Query query = session.createQuery...例如:String hql = "FROM Order o WHERE o.customer.name = :customerName";Query query = session.createQuery...例如:String hql = "SELECT CONCAT(firstName, ' ', lastName) FROM Customer";Query query = session.createQuery
是类名 区分大小写,相当于select * from t_book; String hql="from Book"; List list = session.createQuery...后设置别名,如果设置了别名就得使用 String hql="from Book b where b.price>40"; List list = session.createQuery...; List list = session.createQuery(hql) .setDouble(0, 40)//为占位符设置参数...String hql="select new Book(b.name,b.author) from Book b"; List list = session.createQuery...public void testCount(){ String hql="select count(id) from Book"; List list=session.createQuery
否则就用list();其返回类型为Object uniqueResult()方法通常是在业务方法查询语句中用到的,比如(UsersRoles)getSession().createQuery(“...Query query = session.createQuery(“from Student”); 8....//List list = session.createQuery(“from Student”).list(); 10....Query query = session.createQuery(“from Student”); 8....//List list = session.createQuery(“from Student”).list(); 10.
List list = session.createQuery(hql).list();//正因为查询是面向对象的,所以不需要封装。...; List list = session.createQuery(hql).setInteger(0, 25).list(); //setInteger...; List list = session.createQuery(hql).setParameter(0, 25).list(); //这里设置参数要注意数据类型...; List list = session.createQuery(hql) ....聚合函数查询: String hql = "select count(*) from Student "; Long count = (Long)session.createQuery(
根据ID查询实体 // 不推荐 Demo demo = getSession().createQuery("from Demo where id=?")....demo = getHibernateTemplate().get(Demo.class, id); 根据某些条件查询 // 不推荐 List demos = getSession().createQuery...= getHibernateTemplate().find(hql, param1, param2); 根据某个条件查询唯一的返回值 // 不推荐 Demo demo = getSession().createQuery...param2).executeUpdate(); return null; } }); 查询数目 // 不推荐 Long count = (Long)getSession().createQuery..., param1, param2)); 分页查询 // 不推荐 Query query = getSession().createQuery(hql).setParameter(0, param1).setParameter
String hql = "from Blog b where b.author=:author"; //参数名方式 Query query = session.createQuery...; Query query = session.createQuery(hql); //添加参数 query.setString(0, "%中%"); ...; Query query = session.createQuery(hql); //添加参数 query.setString(0, "13612349876...查询所有博文,返回标题和内容 String hql = "select title,content from Blog"; Query query = session.createQuery...查询所有博文,返回标题和内容 String hql = "select title,content from Blog"; Query query = session.createQuery
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