Question

I am having a trouble with executing an HQL query like this:

select new myPackage.view.CoverDocumentReportView(Re.code AS fulCd,
Re.creditPrice AS crtprc,
Re.debitPrice  AS dbtprc,
(Re.debitPrice - Re.debitPrice) AS redbtprc,
(Re.creditPrice- Re.creditPrice) AS recrtprc,
(Re.debitPrice-Re.creditPrice)   AS rem) 
from 
(select  fullCode as code, 
     sum(creditPrice) as creditPrice ,
     sum(debitPrice)  as debitPrice   
from    DocumentMaster DM,
     DocumentAccount   DA,
     Tree              T ,
     AccountTree       AT, 
     DocumentDetailed  DD 
where DM.id =  DA.documentMaster  and  
      DA.accountTree =  T.id      and   
      DA.accountTree =  AT.id     and   
      DD.documentAccount =  DA.id 
group by  DA.accountTree ) As Re

---

1)
If I execute this like:

SQLQuery crit = (SQLQuery) session
            .createSQLQuery(sql).setResultTransformer(Transformers.aliasToBean(CoverDocumentReportView.class));
ArrayList<CoverDocumentReportView> li =  (ArrayList<CoverDocumentReportView>) crit.list();

ERROR 2012-12-22 14:16:19,838 [http-8080-1] org.hibernate.util.JDBCExceptionReporter : You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘.datx.web.accounting.view.CoverDocumentReportView(Re.code AS fulCd,
Re.creditP’ at line 1

---

2)
If I execute it with this:

Query query = session.createQuery(sql).setResultTransformer(Transformers.aliasToBean(CoverDocumentReportView.class));
ArrayList<CoverDocumentReportView> li =  (ArrayList<CoverDocumentReportView>)query.list();

The error will be:

ERROR 2012-12-22 14:51:46,709 [http-8080-1] org.hibernate.hql.ast.ErrorCounter : line 1:224: unexpected token: (
ERROR 2012-12-22 14:51:46,709 [http-8080-1] org.hibernate.hql.ast.ErrorCounter : line 1:308: unexpected token: sum

What is the problem?

Answer 1

SQL and HQL are two different languages.

HQL doesn’t support subqueries in from clauses, so this query can’t be an HQL query.

And SQL doesn’t know about Java objects, and doesn’t have any new() function allowing to create them, so the query is not a valid SQL query either.

Make it a valid SQL query, execute it using createSQLQuery(), then iterate through the results and create instances of your objects from the returned rows. Or use a result transformer as you’re doing, which will do that for you. the result transformer will use the aliases you assigned to the returned columns of the SQL query to create beans for you. You don’t need any new CoverDocumentReportView() in the query to make that work. Read the javadoc for details.