Be careful of the start-end date query trick - it does not work.
There was a bug in the SDK that made it appear to work.
"an entity will only match the query if it has an individual value for
that property that matches all of the inequality filters"
http://code.google.com/appengine/docs/python/datastore/queriesandindexes.html
You can store any Collection (but not array) and it will become a
multi valued property. All collection types are returned as an
ArrayList - even sets etc.
JD
On 26 Feb 2010, at 13:38, Max wrote:
ListProperty is simply a collection.
You can simply persist a list of GAE primitive type into datastore
On Feb 25, 9:07 pm, Steve Pritchard <steve...@gmail.com> wrote:
This post is very helpful found
athttp://appengine-cookbook.appspot.com/recipe/how-to-query-by-date-range
Often, you need to store, and retrieve, data that needs to match an
"effective date period", containing a "start date" and "end date".
...
You can handle your query if you add another field in your Kind, a
ListProperty containing both the start date and end date. For
example,
add a ListProperty named "date_list", and populate it like this:
date_list = [start_date, end_date].
My Question.
In Java, what constitutes a ListProperty. I assume ArrayList. I am
hoping that an int[] also counts because this has much less overhead
to store.
Does anybody know or know where the rules for ListProperty might be
found.
Thanks.
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