How to access spatial data by using Entity Framework
This article describes an All-In-One framework sample that is available for download. This code sample demonstrates a step-by-step guide that illustrates how to access spatial data by using Entity Framework.
This code sample is part of the AzureBingMaps application sample that demonstrates a lot of technologies which include how to access spatial data by using Entity Framework.
- For more information about how to access spatial data by using ADO.NET Entity Framework, visit the following MSDN blog:
- For more information about the AzureBingMaps application, visit the following MSDN website:
Download informationTo download this code sample, click one of the following links:
Technical overviewThe simplest solution to access a database from a .NET Framework-based application is using Entity Framework. However, Entity Framework doesn't support spatial data in SQL Azure or in SQL Server currently, it supports relational data only.
To access spatial data, a common approach is that convert the geography type to the varbinary (max) type. Because SQL Azure stores geography data as binary format and Entity Framework supports binary data type, you can run the following code to create an object model that maps the binary CLR type to the geography SQL type:
After you run this code, you can generate an Entity Framework model.
CREATEVIEW [dbo].[TravelView]ASSELECT PartitionKey,RowKey,Place,CAST(GeoLocation ASvarbinary(MAX))AS GeoLocation, TimeFROM dbo.Travel
- Because a view is read only, when you access spatial data, we recommend that you handle the Insert, Update and Delete operations by running stored procedures.
- For more information about how to work with spatial data, visit the following MSDN blog. The blog includes information about how to add custom properties to Entity Framework model, how to override SaveChanges, and how to implement retry logic when accessing SQL Azure data:
Technology categorySQL Server, SQL Azure
LanguagesThis code sample is available in the following programming languages:
PrerequisitesTo run this code sample, you must install the following products:
- Microsoft SQL Server
- Microsoft SQL Azure
- Microsoft .NET Framework 4
ReferencesFor more information about how to accessing spatial data by using Entity Framework, visit the following MSDN blog:
What is All-In-One Code Framework? All-In-One Code Framework shows most Microsoft development techniques by using code samples in different programming languages. Each example is carefully selected, composed, and documented to show one common code scenario. For more information about All-In-One Code Framework, visit the following Microsoft website:
How to find more All-In-One Code Framework samplesTo find more All-In-One Code Framework samples, search for "kbcodefx" together with related keywords on the Microsoft support Web site. Or, visit the following Microsoft website:
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Article ID: 2555356 - Last Review: 06/09/2011 03:45:00 - Revision: 1.0
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