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Deploying applications


From:

Up and Running with NoSQL Databases

with Joseph LeBlanc

Video: Deploying applications

With photos and names already in the database, the only thing we need now is some way of displaying the data in a browser. This is made possible in CouchDB through the concept of applications. With an application, you can upload HTML and JavaScript that can be served directly to a browser. First, let's navigate to the restaurant database. If it's not already appearing, select the Items view. This Items view has the name of the menu items along with the document IDs and the file name of the image of the menu item.
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Watch the Online Video Course Up and Running with NoSQL Databases
56m 57s Intermediate Nov 30, 2012

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Explore the possibilities NoSQL databases offer developers for unparalleled flexibility and performance. In this course, author Joseph LeBlanc shows how to build an entire web application with CouchDB and introduces techniques such as querying with JavaScript, working with nested data, and creating views. He also explains some of the trade-offs you might encounter with NoSQL databases, such as the complexity of partitioning data across multiple servers, and presents five commonly used NoSQL databases: CouchDB, MongoDB, Cassandra, Riak, and Redis.

Topics include:
  • What is NoSQL?
  • Installing CouchDB on Mac, Windows, and Linux
  • Storing data
  • Nesting document data
  • Specifying search criteria
  • Reducing data
  • Attaching and retrieving images
  • Deploying applications
  • Securing CouchDB
  • Understanding the CAP theorem
Subjects:
Developer IT
Software:
NoSQL CouchDB MongoDB Cassandra Riak Redis
Author:
Joseph LeBlanc

Deploying applications

With photos and names already in the database, the only thing we need now is some way of displaying the data in a browser. This is made possible in CouchDB through the concept of applications. With an application, you can upload HTML and JavaScript that can be served directly to a browser. First, let's navigate to the restaurant database. If it's not already appearing, select the Items view. This Items view has the name of the menu items along with the document IDs and the file name of the image of the menu item.

Now let's take a look at index.html in the exercise files. This HTML file runs a jQuery-based application. When the document is ready, we first get the data from the view. We do this using the getJSON() method. Once the data has been retrieved, we then cycle over all the results. For each result, we construct an image URL using the row.id, and the value. And then finally, we add the menu item name as well as the image to the photos div.

Let's upload index.html to our database so that we can serve it back to the web browser. Select Design Documents from the View dropdown, and then select Design Menu. This is the design document that was created when we created the Items view. Now select Upload Attachment, and then browse for index.html. Finally, click Upload. Now index.html is displayed as an attachment to this design document.

Click on index.html. All of the menu items now appear along with their photos. This view automatically updates whenever we change the items. Let's remove one of these documents so that it updates the menu. Go back to the homepage for Futon. Then click restaurant. And now, let's remove one of these documents. This is the keylimepie document. Click Delete Document, and then click Delete. Now, let's go back to the Photos page and click Refresh.

Now that we've removed key lime pie from the database, our application also updates. The design document gives us a place to upload HTML, JavaScript, and other assets served to web browsers. Since the data is already available in JSON format over HTTP, CouchDB has everything we need to serve, store, and manage a complete web application.

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