Hibernate3增删查改操作【HQL】

前提:所有sql语句中的表名统统在hql中换成实体类名!
一、HQL

//1.查询所有(格式与sql差别):
 from Student
//2.部分查询:
 select name,age from Student
//3.条件查询(别名):
 from Student a where a.city = '上海'
 select a.name,a.age from Student a where a.name like '%王%'
//4.插入(格式与sql差别):
 session.save()
//5.条件删除(格式与sql差别): 
 delete Student a where a.city = '上海'
//6.条件更新:
 update Student a set a.age=25 where a.city = '上海'
二、增删查改核心代码:
1.添加:
	/*省略了获取session等操作*/
	Student student = new Student();
	student.setStuNo("5");
	student.setStuName("lisi");
	session.save(Studnet);
	/*省略了关闭session等操作*/
2.查询:
	/*省略了获取session等操作*/
	String hql = "from Student";			//全部查询
	//String hql = "select name,age from Student";  //部分查询
	Query query = session.createQuery(hql);		//预处理hql语句
	List list = query.list();			//返回结果list
	/*省略了关闭session等操作*/
3.删除:
	/*省略了获取session等操作*/
	String hql = "delete Student a where a.city = '上海'";
	Query query = session.createQuery(hql);			
	query.executeUpdate();		
	/*省略了关闭session等操作*/
	
4.更新:
	/*省略了获取session等操作*/
	String hql = "update Student a set a.age=25 where a.city = '上海'";			
	Query query = session.createQuery(hql);			
	query.executeUpdate();		
	/*省略了关闭session等操作*/


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转载自blog.csdn.net/qq_37230121/article/details/80657185