Hibernate groupproperty method — sets the property column participating in the grouping

groupProperty(String propertyName)

Example

Criteria criteria = session.createCriteria(UserForm.class);  //获取Criteria对象
criteria.setProjection(Projections.projectionList()  //设置投影查询列
                                                 .add(Projections.groupProperty("username"))
                                                 .add(Projections.rowCount(),"count"));  //设置添加分组的属性列
list = criteria.list();  //执行查询语句，获取查询结果集
Iterator it = list.iterator();  //获取查询迭代器
while(it.hasNext()){  //循环遍历迭代器
  Object[] o = (Object[])it.next();
  System.out.println("用户名:"+o[0]+"人数:"+o[1]);
}