Question

I wish to generate reports for my application, one such report requires to display list of orders given today. For that I have the following method in my ejb which returns nothing (debugged and found so):

public Collection<OrderStock> getOrderReport(String userName) {
   String strQuery = null;
    strQuery = "Select o from OrderStock o where o.userName.userName = :userName and o.orderDateTime = :orderDateTime";

     Collection<OrderStock> c = em.createQuery(strQuery).setParameter("userName",userName).setParameter("orderDateTime", new Date(),TemporalType.DATE).getResultList();

   return c;
}

How do i solve it? Why does it return nothing?

edited:
I am using mysql as backend
datatype of orderDateTime is DateTime
eg os data in orderDateTime : 2012-06-05 00:12:32
2012-06-05 11:34:42
2012-04-05 12:32:45

Answer 1

You have a DateTime column, and are looking for posts on a single date. I suspect this datetime column contains seconds or miliseconds since the Epoch. You can’t compare times to dates, so you will have to convert the day to a time. Actually two times that describe the day.

SELECT o 
FROM OrderStock o 
WHERE 
    o.userName.userName = :userName 
    AND (
        o.orderDateTime >= FirstSecondOfTheDay
        OR o.orderDateTime <= LastSecondOfTheDay
    )

Depending on your database system you can calculate these seconds (or milliseconds, i don’t know your table) using the database or rather do it in java