如何从Azure移动服务获取数据

Question

I am trying to get some data from azure MS sql database with azure mobile services. I wrote the code as like below but when I call the method it is returns null. Where am I doing wrong? What is the query that I should use?

private void refreshNumsFromTable() {


    new AsyncTask<Void, Void, Void>() {
        @Override
        protected Void doInBackground(Void... params) {
            try {

                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {

                        mPhonesTable.where().field("PhoneNumber").execute(new TableQueryCallback<PhoneNumbers>() {

                            @Override
                            public void onCompleted(final List<PhoneNumbers> result, int count,Exception exception, ServiceFilterResponse response) 
                            {

                                runOnUiThread(new Runnable() {
                                    @Override
                                    public void run() {
                                        mAdapter.clear();
                                        for(PhoneNumbers num : result)
                                        {
                                            mAdapter.add(num);
                                        }
                                    }
                                });

                            }
                        });
                    }
                });

            } catch (Exception e) {
                createAndShowDialog(e, "Error");
            }

            return null;
        }
    }.execute();

}

Answer 1

You don't have a complete predicate there. By using the where() method, you're asking for results where PhoneNumber meets some criterion, but you aren't specifying that criterion. You need to say that it's equal to something ( eq() ) or that it starts with some string:

mPhonesTable.where().field("PhoneNumber").eq("555-555-5555").execute().get(); or mPhonesTable.where().startsWith("PhoneNumber", "555").execute().get();

If you're trying to just return the PhoneNumber column, then use the select() method:

mToDoTable.select("PhoneNumber").execute().get();

For more information, please see the Mobile Services Android SDK reference: https://azure.microsoft.com/en-us/documentation/articles/mobile-services-android-how-to-use-client-library/#querying