Always use an explicit query if we aren't using a cache.

src/java/com/samskivert/jdbc/depot/DepotRepository.java

@@ -148,7 +148,8 @@ public abstract class DepotRepository
         throws PersistenceException
     {
         DepotMarshaller<T> marsh = _ctx.getMarshaller(type);
-        boolean useExplicit = (marsh.getTableName() == null) || !marsh.hasPrimaryKey();
+        boolean useExplicit =
+            (marsh.getTableName() == null) || !marsh.hasPrimaryKey() || !_ctx.isUsingCache();
 
         // TODO: This is a very conservative approach where all complicated queries are handled
         // TODO: with the traditional single-pass query. The double pass algorithm can handle a

src/java/com/samskivert/jdbc/depot/PersistenceContext.java

@@ -264,6 +264,14 @@ public class PersistenceContext
         return rows;
     }
 
+    /**
+     * Returns true if there is a {@link CacheAdapter} configured, false otherwise.
+     */
+    public boolean isUsingCache ()
+    {
+        return _cache != null;
+    }
+
     /**
      * Looks up an entry in the cache by the given key.
      */