In this example, the user must be authenticated. In this example, either Facebook or Twitter is available, so one of these will be a part of the value. The first thing to do is test the code to validate the input. I want to verify that the latitudes and longitudes brought in are valid numbers. If not, the insert will exit immediately. The next step is to parse the passed-in userId to get the network provider and the numeric user identifier.
The third step is to set up the dates so they can be inserted into the database. Now a query needs to be done. A Node. Finally, the question of debugging comes up. JavaScript has the console. Note the built-in refresh functionality at the top right of the screen.
Once WAMS is set up, it can be managed via the windowsazure. Note: Calling from a WAMS script file to a method may result in an error with the default setup because they run in different schemas.
Permissions might need to be granted depending on your specific situation. Jeff Sanders has a blog post about this issue at bit. Mobile apps can put a tremendous load on infrastructure, and luckily Windows Azure has several options to handle this. First, you have several alternatives for message queuing. Queuing lets you quickly store data without tying up the app. Under heavy load, an app can wait on a response from a remote data source. Instead of interacting directly with a data source, an app can store data in a queue, which will free the app to continue processing.
Based on personal experience, using queuing can easily increase the scalability of an app. Overall, queuing is a great solution for data-intensive apps. Another tool in the scaling toolbox is auto scale. Windows Azure lets you monitor the health and availability of an app from a dashboard. You can set up rules to notify an application administrator when the availability of services is degraded.
Windows Azure lets an app scale up or down to match demand. By default, this feature is turned off. Every day, Windows Azure will scale back down to the set minimum. The general rule is to set the daily quota to handle the expected daily traffic and allow Windows Azure to scale up as necessary. As this is being written, health, monitoring and auto scaling are available in preview. Data is the root of any app and the basis for nearly every business.
First, it has support for location-based services in the base product. To make this easier, I wrote two stored procedures to calculate these distances.
The result can be compared with the current maximum drive within the system. The SQL function CalculateDistance takes two geography points and calculates the distance between them, as shown in Figure 3. Figure 4 shows the table used to hold the data about the drive. The StartingPoint and EndingPoint columns hold the starting and ending geographic points of a drive. The Distance column is a calculated column. The deviceToken and deviceType columns hold a token that identifies the device and the type of the device Windows Phone-based or iPhone.
The app currently only communicates back to theposting device if a new drive entered is the new leader. One of the great features of WAMS is that a database table schema is dynamic by default. As you move from development to production, this should be turned off. The last thing you want is some type of schema change to a running system due to a programming mistake.
Accessing data with a mobile device with an unreliable and a relatively high-latency network is significantly different from accessing data over a wired connection and relatively low-latency network. There are two general rules to get data with a device.
First, data access must be done asynchronously. Given the unreliable nature and high latency of mobile networks, locking the UI thread in any way is a really bad idea. If getting data takes too long, the device OS will assume the app is hung and kill it. The second rule is that the transferred data must be relatively small. Sending too many records to a mobile device will cause problems due to the low-speed, high-latency networks common in mobile provider systems and the fact that mobile device CPUs are optimized more for low power consumption than for processing data like a laptop or desktop CPU.
WAMS addresses both these issues. Data access is asynchronous and queries are automatically done via a paging algorithm. This makes working with REST somewhat mistake-prone. To make development easier, you can create a proxy locally. The proxy for this example is shown in Figure 5. The properties of an object instance can be accessed in the server scripts. Query Data Querying data in Windows Azure is actually simple. The data will be returned via a call through a LINQ query. It gives you the ability to download multiple files at one time and download large files quickly and reliably.
It also allows you to suspend active downloads and resume downloads that have failed. Microsoft Download Manager is free and available for download now. Warning: This site requires the use of scripts, which your browser does not currently allow.
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The manifest designer makes it easy to provide Windows Phone assets within your app. If you are creating a universal project, the manifest designer enables you to specify visual assets for both your Windows Phone and Windows Store apps.
If you have any questions or comments, feel free to comment below or post on the forums! When they are both not busy posing for photos or writing bios of themselves, they spend a lot of time thinking about how to provide great tooling experiences for HTML, CSS, and JavaScript developers. Comments are closed. Mads Kristensen Principal Program Manager. Jordan Matthiesen Senior Program Manager.
Justin Johnson. Grace Taylor Program Manager. Leslie Richardson Program Manager. Building Windows Phone 8. April 8th,
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