CODEWITHSUNDEEP
google-app-engineobjectify
cloudpre
cloudpre

Reputation: 1001

Store & index List of Strings in Google AppEngine

I am using AppEngine's native Datastore API to store objects in Java.

I have a requirement to search on various items in an object - eg: email address, subject of email, from name etc. It should show the results even for partial input - like real-time searches.

To achieve that, I am tokenizing the items into possible inputs into fragments using StringUtils2.breakdownFragments - the string "Foo Bar" would become: "f", "fo", "foo", "b", "ba", "bar"

What I do not understand is how can I give this list of Strings to be indexed and how can I retrieve them back applying filters?

While using JDO or Objectify, I see it to relatively straight forward but using it via the native API, I do not how to do it.

Entity does not take a list to be stored.

Can it even be done?

Upvotes: 0

Views: 541

Answers (2)

Starman
Starman

Reputation: 426

Beware of exploding indexes. Each list property item gets indexed separately. You will be very limited in the complexity of the queries you can run. I went that road before the advent of the Search API.

If your search feature can tolerate being out of sync for small amount of times, I would suggest using the Search API to implement your feature.

Upvotes: 0

stickfigure
stickfigure

Reputation: 13556

You can call Entity.setProperty() and pass a List<String> as the value.

Upvotes: 0

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