How to get dbEntityName from a transient object?

From: Borut Bolčina (borut.bolcin..mail.com)
Date: Wed Jul 23 2008 - 04:45:11 EDT

  • Next message: Andrey Razumovsky: "MissingSessionException"

    Hello,

    is there a better solution to creating a dummyDataContext just to get
    dbEntityName and then unregistering all objects:

                DataContext context = DataContext.createDataContext();
                // item is TRANSIENT
                CayenneDataObject item = (CayenneDataObject)
    allItemsFromOneProvider.iterator().next();
                // so create a dummy data context
                DataContext dummyContext = DataContext.createDataContext();
                dummyContext.registerNewObject(item);
                // just to find out table name
                logger.debug("item.getObjEntity().getDbEntityName(): " +
    item.getObjEntity().getDbEntityName());
                String tableName = item.getObjEntity().getDbEntityName();
                // now unregister item
                dummyContext.unregisterObjects(allItemsFromOneProvider);

                context.performGenericQuery(new NamedQuery("DeleteAll",
    Collections.singletonMap("table", tableName)));

                // now do a clean insert
                logger.info("Persisting...");
                for (Iterator i = allItemsFromOneProvider.iterator();
    i.hasNext();) {
                    item = (CayenneDataObject) i.next();

                    context.registerNewObject(item);
                }
                context.commitChanges();

    Regards,
    Borut

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