How to specify custom query as well as a selection criteria

Question

Hi
I'm struggling to specify a custom select query with variable no. of agruments through toplink.
The custom query looks like:
select outer.col1, outer.col2, outer.col3,
outer.effective_date, outer.capacity_rate, outer.expiry_date, outer.comments, outer.create_date,
outer.create_user_id, outer.modify_date, outer.modify_user_id, outer.vol_uom_type_code
from tbl outer,
( select max(effective_date) effective_date, col1, col2, col3 from tbl
where expiry_date is null
or (trunc(effective_date) >= to_date('01/01/'||to_char(sysdate,'yyyy'), 'dd/mm/yyyy') )
group by col1, col2, col3
) inner
where outer.col1 = inner.col1
and outer.col2 = inner.col2
and outer.col3 = inner.col3
and trunc(outer.effective_date) = trunc(inner.effective_date)
My domain class TBL.class is mapped one to one with DB Table TBL.
With this customer query, I want to add a selection criteria depending upon what is specified on the UI-screen - I can get col1, col2 or a combination of these as search criteria.
So far I have tried multiple approaches:
1. Specifying the custom query (without arguments) as a ReadAll Query in toplink descriptor and then using expression builder to add the criteria but this doesn't work as custom ReadAll query gets overridden and i get back all the results from
TBL which match the criteria specified.
expFinal = new ExpressionBuilder().get("col1").equal(srchCriteria.getCol1());
results = (List) getTopLinkTemplate().readAll(TBL.class,expFinal,false);
2. Using Named Query:
Toplink doesn't allow me to specify a custom SQL along with a selection criteria - both for the same NamedQuery.
3. Specifying the DB query in java layer and then adding arguments and argument values. When query is executed, i don't see arguments being added.
ReadAllQuery query = new ReadAllQuery(TBL.class);
query.setSQLString(READ_ALL_QUERY);
ExpressionBuilder exp = new ExpressionBuilder();
query.addArgument("col1", Long.class);
Vector vect = new Vector();
vect.add(srchCriteria.getCol1());
query.addArgumentValues(vect);
result = (List) getTopLinkTemplate().executeQuery(query, false);
Please suggest. Would be great if you could share some code bits.
Thanks
Nitin

Answer 1

Nitin,
This style of query does require code to apply logic as it is created. If you wish to have this used as a named query you can use a query re-direct so that instead of executing a query we call a method of yours.
You can setup your named query to use re-direction into a static method as:
        QueryRedirector redirector = new MethodBaseQueryRedirector(QueryRedirectorExample.class, "redirectMethod");
        ReadAllQuery raq = new ReadAllQuery(Employee.class);
        raq.addArgument("FIRST_NAME");
        raq.setRedirector(redirector);
        descriptor.getDescriptorQueryManager().addQuery("findByFirstNameLike", raq);The static method that then gets invoked where you can dynamically create a query looks like:
    public static Object redirectMethod(DatabaseQuery query, Record record, Session session) {
        String firstName = (String)record.get("FIRST_NAME");
        ReadAllQuery raq = new ReadAllQuery(Employee.class);
        if (firstName != null) {
            raq.setSelectionCriteria(raq.getExpressionBuilder().get("firstName").likeIgnoreCase(firstName));           
        return session.executeQuery(raq);
    }Doug