Google App Engine, Java Datastore Query : How to do SQL Like Statement?

Question

I have entity:

Entity e = new Entity("Item");
e.setProperty("Description", Description);

And I am trying to perform a keyword search. Ex, If i have "abc", "eabcd" and "abc block", when I perform the search "abc", it should return all three.

If I am using SQL, I would say something like this:

Select * from Item where Description like "%"+keyword+"%"

I know I can do this, but this will only return "abc".

public static Iterable<Entity> SearchItems(String Description) {
    DatastoreService ds = DatastoreServiceFactory.getDatastoreService();
    Query q = new Query("Item").addFilter("Description",
            FilterOperator.EQUAL, Description);
    return ds.prepare(q).asIterable();
}

What should I do?

PS I have seen this but this is not particularly helpful. Google App Engine and SQL LIKE

Answer 1

What you need is a full text search , and App Engine datastore does not support that. You need to use the App Engine Search API to do such queries .

However, the API does not support applying the full text queries to the datastore, you need to build and store your data in indexed documents . You might need to consider duplicating the data in your datastore and store it again in the indexed document storage.