By Vinodh Kumar
This ebook introduces beginner builders to quite a number info entry techniques for storing and retreiving info either in the community and remotely. It will give you quite a number absolutely operating facts entry recommendations and the perception you want to understand while, and the way, to use all of the options to top advantage.
Focussing particularly on how the home windows eight app developer can paintings with the home windows Runtime (often known as home windows RT) framework this booklet offers cautious research of the numerous recommendations you will have open to you, besides a comparision in their strengths and weaknesses below various stipulations. With the times of a unmarried database being the perfect selection for the majority improvement initiatives long past. you are going to lean that definitely the right selection to your app now depends upon a number of components and getting it correct can be serious for your customer's finish consumer experience.
We disguise various info entry options starting from storing and retrieving info in the community utilizing the JET API, to utilizing the most well-liked open and closed resource database items like SQLite and SQL Server. we glance at how light-weight HTML and JavaScript apps paintings good with both feather-weight information shops like IndexedDB. We'll additionally introduce you to extra complex facts entry strategies like leisure (JSON), WCF RIA companies, ASP.NET MVC four internet API and home windows Azure which can highly extend the horizons of what it's attainable to your app to do as garage - or even processing - are taken past the confines of your user's device.
By the time you might have learn this booklet you'll be accustomed to the foremost info entry issues it is very important overview as you construct you apps and you'll be capable of optimistically opt for the knowledge entry structure that's correct to the app you must construct.
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Extra resources for Beginning Windows 8 Data Development: Using C# and JavaScript
Example text
And with that, we’re ready to look at closures. When we combine our knowledge of value types, reference types, arguments, and closures, we’ll understand why this function always evaluates to true no matter what argument you apply it to: 1 2 3 4 5 function (value) { return (function (copy) { return copy === value })(value) } Closures and Scope It’s time to see how a function within a function works: The first sip: Basic Functions 1 2 3 4 5 6 14 (function (x) { return function (y) { return x } })(1)(2) //=> 1 First off, let’s use what we learned above.
Another, 2, evaluates to the number 2. JavaScript now evaluates applying the function to the argument 2. Here’s where it gets interesting… An environment is created. The value ‘2’ is bound to the name ‘x’ in the environment. The expression ‘x’ (the right side of the function) is evaluated within the environment we just created. The value of a variable when evaluated in an environment is the value bound to the variable’s name in that environment, which is ‘2’ And that’s our result. }. meaning, that the environment is a dictionary, and that the value 2 is bound to the name x, and that there might be other stuff in that dictionary we aren’t discussing right now.
Behold: 1 2 3 4 5 6 7 8 function tap (value) { return function (fn) { if (typeof(fn) === 'function') { fn(value) } return value } } tap is a traditional name borrowed from various Unix shell commands. It takes a value and returns a function that always returns the value, but if you pass it a function, it executes the function for side-effects. log("Our drink is", it) }); And if you wish it to do nothing at all, You can write either: 1 var drink = tap('espresso')(); Or: 1 var drink = tap('espresso', null); tap can do more than just act as a debugging aid.