CODEWITHSUNDEEP
javagoogle-app-enginegoogle-cloud-datastore
Ratan Kumar
Ratan Kumar

Reputation: 1650

add filter query in Google app engine

I am having problem with filtering the entities after addFilter() has been

deprecated from Google App Engine .

Objective : to list those Entities which are having UID = "rahul"

what i tried :

com.google.appengine.api.datastore.DatastoreService ds=DatastoreServiceFactory.getDatastoreService();

    Query q = new Query("Upload");
    q.setFilter(FilterOperator.EQUAL.of("UID","rahul"));
    PreparedQuery pq = ds.prepare(q);

    for (Entity result : pq.asIterable())   

       {
            String title = (String) result.getProperty("url");
            resp.getWriter().println(title);
        }

And this is my DataStore Instance for "Upload" Entity :

Upload Entity Instance in Datastore

But, I am getting a blank page when launching the app .

Upvotes: 2

Views: 3714

Answers (2)

sumitkanoje
sumitkanoje

Reputation: 1245

As addFilter() is deprecated, you may also use following code:

To create a single filter: 

query.setFilter(new Query.FilterPredicate("UID", FilterOperator.EQUAL, "rahul"));

To create multiple filters:

After you build all of your filters, combine them together using a CompositeFilter: 

new CompositeFilter(CompositeFilterOperator.AND, Arrays.asList(filter1, filter2));

Then set it as the filter to your query by writing: 

query.setFilter(composite_filter);

Upvotes: 2

S.P Singh
S.P Singh

Reputation: 1289

It should give the desired output. If it is giving blank page then kindly check logs in Google Dashboard or shared logs.

Upvotes: 0

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