By David Gries

This can be the first actual e-book to debate the idea and ideas of computing device programming at the foundation of the concept an explanation of correctness and a application might be constructed hand in hand. it truly is equipped round the technique first proposed by means of Dijkstra in his monograph The self-discipline of Programming (1976), concerning a "calculus for the derivation of programs." Directing his fabrics to the pc programmer with at the least 365 days of expertise, Gries provides specific rules in the back of application improvement, after which leads the reader via instance courses utilizing these rules. Propositions and predicate calculus are provided as a took for the programmer, instead of easily an item of analysis. The reader should still come away with a clean outlook on programming concept and perform, and the peace of mind to advance right courses successfully.

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By hosting both your application and your database in Azure, you minimize the network latency of requests to the database. Overview The SQL Database architecture is divided into four layers: the client layer, the service layer, the platform layer, and the infrastructure layer. Figure 3-2 shows these layers. 30 Chapter 3 ■ Geospatial with Azure SQL Database Figure 3-2. SQL Database Architecture consists of four layers: Client, Service, Platform and Infrastructure Layer The Client Layer The client layer can reside either on premise or on Azure.

This abstraction is necessary due to the fact that DateTime types require single quotes around them to be inserted, for example ‘20130107’, however, it can be often confused with a string. 44 Chapter 3 ■ Geospatial with Azure SQL Database Another interesting type is the geometry type, which is one of the geospatial types supported by SQL Database, as we described earlier. Here we used a single geometry, Point, to represent our latitude and longitude. Close(); } } Wrapping up In this chapter you learned about hosting geospatial data on SQL Database.

Scalability is made possible because SQL Database enables you to spin up as many virtual machines as you require. Availability is made possible because SQL Database handles the load balancing for you. And security and reliability are possible because SQL Database replicates your data across different locations and Windows Azure automatically handles the security for you. Your databases may reside on different physical computers at the Microsoft data center. One key difference is that because your data is automatically replicated, and you do not have access to the computer’s file systems; the SQL Server backup and restore commands are not applicable to SQL Database.

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