Collection Counts

The IPojos interface has always provided a method for returning the count of some collection types via getDetails().getCounts(). Previous to 3.0-Beta3, the counting process was fairly time intensive, and has been removed.

In its place, the 3.0-Beta3 server has database views for all link collections. These are accessed through HQL directly, such as:

   Long self = iAdmin.getEventContext().getCurrentUserId();
   Image i = iQuery.findByQuery(
      "select i from Image i left outer join fetch i.annotationLinksCountPerOwner", null);
   Map<Long, Long> countsPerOwner = i.getAnnotationLinksCountPerOwner();

   // Map may be null if not fetched.
   if (countsPerOwner != null) {
       
       // countOfAnnotationsForImageByUser 
       Long count = countsPerOwner.get(self);
       if (count != null) {
           // do something
       }
   }

Values written to the map will not be persisted to the database, since they are continually re-generated.

Pojo Options

The PojoOptions configuration of what elements are counted has been removed from the API. Instead, the returned map contains all values for all users, and can be summed to acquire the total count.

Restrictions

Currently a Hibernate bug (waiting to be filed) prevents retrieving the counts on any other than the top-level object ("select this").

Instructions

Starting with OMERO3A__3, the views.sql script is automatically executed when initializing your database. If you have an older database, upgrade it to the latest version, and apply the views.sql manually.

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