[hibernate-issues] [Hibernate-JIRA] Created: (HHH-2676) Cannot apply UPGRADE lock to scalar Query object

[John Wood (JIRA)]

Cannot apply UPGRADE lock to scalar Query object
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                 Key: HHH-2676
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2676
             Project: Hibernate3
          Issue Type: Bug
          Components: query-hql
    Affects Versions: 3.1
            Reporter: John Wood
            Priority: Minor
         Attachments: Bean.hbm.xml, Bean.java

If you try and add a lock to a Query object (against a named alias) when doing a scalar HQL query (e.g. "select sum(foo) from bah") then an error occurs.

The sample code (full working example is attached):

   // Create query
   Query q = session.createQuery("select b.value from Bean b");
		
   // Set lock mode on query 
   q.setLockMode("b", LockMode.UPGRADE);

   // Executre
   q.list();

This causes the following error:

     Exception in thread "main" java.lang.IllegalArgumentException: could not locate alias to apply lock mode : b
	at org.hibernate.loader.hql.QueryLoader.applyLocks(QueryLoader.java:297)
	at org.hibernate.loader.Loader.preprocessSQL(Loader.java:201)
	at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1538)
	at org.hibernate.loader.Loader.doQuery(Loader.java:673)
	at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
	at org.hibernate.loader.Loader.doList(Loader.java:2220)
	at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2104)
	at org.hibernate.loader.Loader.list(Loader.java:2099)
	at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:378)
	at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:338)
	at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:172)
	at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1121)
	at org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)

I have tried this both with an older version of Hibernate (3.1) and the latest with the same result (although the older Hibernate has the error message "alias not found".

I have attached a simple example to demonstrate this.

See also HHH-1965.

Perhaps, it is simply that one cannot lock scalar queries of this type. If so, then the fix would presumably be to include this in the Query class Javadocs.

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