gonzalad created OPENJPA-2327:
---------------------------------

             Summary: QueryCache as hint
                 Key: OPENJPA-2327
                 URL: https://issues.apache.org/jira/browse/OPENJPA-2327
             Project: OpenJPA
          Issue Type: Bug
            Reporter: gonzalad


Provide a way to enable query cache as a query hint.

This would facilitate writing portable JPA applications.

For the time being, with OpenJPA, we need to execute the following code to cache the query :

{code:java}
OpenJPAEntityManager oem = ((OpenJPAQuery<?>) query).getEntityManager();
OpenJPAEntityManagerFactory oemf = oem.getEntityManagerFactory();
QueryResultCache qcache = oemf.getQueryResultCache();
qcache.pin(query);
{code}

It would be easier if JPA provided a query hint like :

{code:java}
query.setHint("openjpa.cacheable", cache);
{code}

This would even enable us to use it in a NamedQuery declaration :


{code:java}
@NamedQuery(name = "Civilite.findAll",
    query = "SELECT c FROM Civilite c", 
    hints = @QueryHint(name = "openjpa.cacheable", value = "true"))
{code}


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