I have problem to read a value from fetch

Hello,

I am trying this:

var searchAutor= "Shakespeare";
var library = Alloy.createCollection('book');
// The table name is the same as the collection_name value from the 'config.adapter' object. This may be different from the model name.
var table = library.config.adapter.collection_name;
// use a simple query
var query= library.fetch({query:'SELECT * from ' + table + ' where author="' + searchAuthor + '"'});

iTi.API.info(query);

I got undefined, how can I access the value of fetch method?

Thank you for any help