Jaydata and queries (JSQL)

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Javascript

PhoneGap

Kendo

I want something simple in jaydata. I want to run a query and return true or false. For example

var existingPatients = Database.Test.filter("Id", "==", 5);

and then if it returns true i want to update the specific patient of add him

$.getJSON("http://www.json-generator.com/j/bMeLdrhCGa?indent=4", function (result) { //
               $.each(result, function (i, jsonfield) {
                   var existingPatients = Database.Test.filter("Id", "==", jsonfield.Id).toArray();
})
});