标签：批量查询 null lis info static span rownum test 英文
1、查询所有的学生信息：
public static void testSel() { Session session = HibernateUtils.openSession(); Transaction transaction = session.beginTransaction(); Criteria criteria=session.createCriteria(Student.class); List<Student>list= criteria.list(); System.out.println(list); transaction.commit(); session.close(); }
2、条件查询：
运算符与对应的英文缩写：
> gt >=ge <lt <=le ==eq
!=ne in:in between and:：between
like:like is not null:isNotNull
or:or and:and
(1)eq的运用：
public static void testSel() { Session session = HibernateUtils.openSession(); Transaction transaction = session.beginTransaction(); Criteria criteria=session.createCriteria(Student.class); criteria.add(Restrictions.eq("sex","女")); List<Student>list= criteria.list(); System.out.println(list); transaction.commit(); sessio
（2）like的运用：
public static void testSel() { Session session = HibernateUtils.openSession(); Transaction transaction = session.beginTransaction(); Criteria criteria=session.createCriteria(Student.class); criteria.add(Restrictions.like("sname","许__")); List<Student>list= criteria.list(); System.out.println(list); transaction.commit(); session.close(); }
3、分页查询：
需要事先设置起始位置和查询的数量。
public static void testSel() { Session session = HibernateUtils.openSession(); Transaction transaction = session.beginTransaction(); Criteria criteria=session.createCriteria(Student.class); criteria.add(Restrictions.eq("sex","女")); criteria.setFirstResult(1); criteria.setMaxResults(2); List<Student>list= criteria.list(); System.out.println(list); transaction.commit(); session.close(); }
4、总记录数的获取：
public static void testSel() { Session session = HibernateUtils.openSession(); Transaction transaction = session.beginTransaction(); Criteria criteria=session.createCriteria(Student.class); criteria.setProjection(Projections.rowCount());//聚合函数获得总行数 Long rowNum= (Long) criteria.uniqueResult(); System.out.println(rowNum); List<Student>list= criteria.list(); System.out.println(list); transaction.commit(); session.close(); }
标签：批量查询 null lis info static span rownum test 英文
原文地址：https://www.cnblogs.com/zhai1997/p/11829304.html
