我正在尝试执行以下 HQL 查询:
select count(*) , od.itemSubtype.name from OrderDetails od inner join od.itemSubtype where od.employee = 1 group by od.itemSubtype
我的 POJO 是:
OrderDetails
-------------
private Integer id;
private Employee employee;
private Order order;
private ItemSubtype itemSubtype;
private Integer quantity;
private String imageStyle;
private String imageCapture;
private Date workStartedOn;
private Date workFinishedOn;
ItemSubtype
-----------
private Integer id;
private ItemType itemType;
private String name;
private Set orderDetailses = new HashSet(0);
private Set measuresBooks = new HashSet(0);
由于查询无法转换现有的 Pojo,因此我无法检索结果。我怎样才能执行这个查询?我需要写一个新的Pojo吗?另外我如何从迭代中获取数据?
Query query = session.createQuery(hql);
// query.setParameter("employee_id", employee_id);
Iterator i = query.iterate();
while (i.hasNext()) {
Object obj = i.next();
// how to retrive values from this obj??
}
最佳答案
这是获取结果的方法:
Query query = session.createQuery("""
select
count(ist.id),
ist.name
from OrderDetails od
inner join od.itemSubtype ist
where od.employee = 1
group by ist.name
"""
);
for(Object rows : query.list()){
Object[] row = (Object[]) rows;
Number count = (Number) row[0];
String itemSubTypeName = (String) row[1];
}
关于java - POJO 不相关或不可用时的 HQL 查询,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/24598036/