Download e-book for iPad: 6809 Assembly Language Programming by Lance A Leventhal

By Lance A Leventhal

Guide textual content for meeting language geared in the direction of the Motorola 6809 microprocessor that is present in the Tandy TRS-80 laptop.

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There is a slight problem in that most browsers only support GET and POST out of the box. This can be overcome by sending a POST request, and using hidden form fields or JavaScript to send extra information about what the actual request should be to the server, as we’ll see later. Sinatra excels at making these verbs easily accessible through route handlers. In fact, the HTTP verbs are at the start of every route handler, making them central to the way in which Sinatra handles requests. We’ve already used the GET verb in our previous examples; now it’s time to make use of the others.

At the moment, this object is only stored in memory; it hasn’t been saved to the database. save => true If we take a look at what the Song object looks like now, we’ll see that the id property has been set to 1: irb> song => # This is the auto-increment feature of the Serial type taking effect—every new object saved to the database will have an id that’s one more than the previous entry. lyrics = "And now the end is near ... save We’ve now saved all the relevant information about our first song to the database.

DELETE requests are used to delete resources. info Collecting Records Idempotence When a function is applied multiple times to something, but without changing the result after the first application, it is said to be idempotent. In terms of HTTP methods, this means that a request could be made numerous times, but the result will remain the same after the first successful request. GET, PUT, and DELETE are all expected to be idempotent methods. This means that a browser could theoretically repeat a request if it suspected the first had failed and could expect the same results, even if it ends up that both requests are processed.

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6809 Assembly Language Programming by Lance A Leventhal

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