Objectify queries: filter by date

Question

I am using GAE and I need to write an Objectify query that asks for the elements created after September 1st.

The dateCreated field is Java.util.Date and it is store

Answer 1

1. Your column needs to be indexed

   @Indexed protected Date dateCreated;

2. You can sort only by one column in a request (> and < and != are all considered sorting since the index is sorted, then analyzed)

3. You can group dates by loosing precision: 2012-11-29 16:03:59.494000 becomes 2012-11-29 this way, you can use == safely. Create a column for each precision you want (day, week, month). In general, try relying the least possible on sorting operations: sooner or later you will be happy for that choice