hi vasily,
you can use Criteria.PARENT_QUERY_PREFIX to prefix an attribute of the
subquery. see QueryTest#testSubQuery3 and testSubQuery4.
but i've to admit i nver tried it with addOrderBy().
hth
jakob
Vasily Ivanov schrieb:
Hi All,
I've got two classes:
class Parent:
int id
String data
Collection children
class Child:
int id
String data
int parentId
Parent parent
I need to get collection of parents sorted by the number of children,
but I didn't find any way to put Report Query to "ORDER BY" statement.
Here is the code that works:
QueryByCriteria query = QueryFactory.newQuery(Parent.class, new Criteria());
query.addOrderByDescending("(SELECT count(1) FROM CHILD AAA WHERE
AAA.PARENT_ID = A0.ID)");
persistenceManager.getBroker().getCollectionByQuery(query);
This is generated sql:
SELECT A0.ID, A0.DATA, (SELECT count(1)
FROM CHILD AAA
WHERE AAA.PARENT_ID =
A0.ID) as ojb_col_3
FROM PARENT A0
ORDER BY 3 DESC
It works, but I don't like "addOrderByDescending" hard coded table
alias "A0". There should be the way to set report subquery as OrderBy
which should solve the problem.
I changed code to:
query.addOrderByDescending("(SELECT count(1) FROM CHILD AAA WHERE AAA.PARENT_ID =
(id))");
But it doesn't work because of "SqlHelper.splitPath()" I guess, it
doesn't substitute "(id)" by column name "A0.ID".
Any help will be greatly appreciated.
Regards,
Vasily Ivanov
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