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Part 05 – Code First Migrations and Azure Deployment Entity Framework and MVC Series Tom Perkins NTPCUG
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SOURCE See Getting Started with Entity Framework 6 Code First using MVC 5 http://www.asp.net/mvc/tutorials/getting- started-with-ef-using-mvc/creating-an-entity- framework-data-model-for-an-asp-net-mvc- application http://www.asp.net/mvc/tutorials/getting- started-with-ef-using-mvc/creating-an-entity- framework-data-model-for-an-asp-net-mvc- application
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Part 05 Objectives You can change the data model Update the database schema without dropping and recreating the database Deploy to the “cloud” Code First Migrations Azure Deployment
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Code First “Migrations” Feature In development – the data model changes frequently – Model gets out of sync with the database – When the data model changes, we have been: Dropping and recreating the database Reseeding the database with test data In production – We want to keep the data in the database – Use Code First Migrations to Update the database schema without dropping and recreating the database
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Enable Migrations Follow the steps outlined in Timesaver 05 – Activity 1 (Enable Code First Migrations)
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Migrations folder created by EF
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Default Seed Method in Configuration Class internal sealed class Configuration : DbMigrationsConfiguration { public Configuration() { AutomaticMigrationsEnabled = false; } protected override void Seed(ContosoUniversity.DAL.SchoolContext context) { // This method will be called after migrating to the latest version. // You can use the DbSet.AddOrUpdate() helper extension method // to avoid creating duplicate seed data. E.g. // // context.People.AddOrUpdate( // p => p.FullName, // new Person { FullName = "Andrew Peters" }, // new Person { FullName = "Brice Lambson" }, // new Person { FullName = "Rowan Miller" } // ); // }
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Seed Method Allows you to insert or update test data after Code First creates or updates the database schema. Called after each data model change. Deployment: – After deployment, EF checks schema for change – If schema changed, Seed method is run. – Test data should be commented out.
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Set up the Seed Method Follow the steps outlined in Timesaver 05 – Activity 2 (Set up the Seed method) Additional data will be added to the database when the Seed method is run
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The Seed method in a nutshell … Accepts the database context as a parameter Creates new entities in the database For each entity type: – Code creates a collection of new entities – Adds each entity to its appropriate DbSet property – Saves changes to the database
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AddOrUpdate Method AddOrUpdate method – “upsert” operation – Insert or update – see Students, Courses courses.ForEach(s => context.Courses.AddOrUpdate(p => p.Title, s)); First parameter passed (Title) used to check whether entity exists. May cause error if duplicates. See http://blogs.msdn.com/b/rickandy/archive/2013/02/12/seeding-and-debugging-entity- framework-ef-dbs.aspx http://blogs.msdn.com/b/rickandy/archive/2013/02/12/seeding-and-debugging-entity- framework-ef-dbs.aspx
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Execute the first Migration When add-migration command was entered – EF generated code to build the database from scratch – This code is available in a.cs file in the Migrations folder. C:\ContosoUniversity\ContosoUniversity\Migrations\201410 161535324_InitialCreate.cs Up() method in this file creates database tables corresponding to data model entity sets Down() method deletes them The parameter after add-migration (InitialCreate) names the migration.
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First migration … In Package Manager Console – Type update-database Use the Server Explorer to verify the update
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DEPLOY TO WINDOWS AZURE
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Database Handling During Deployment Copying project code to server Nothing happens to DB Run deployed app; access db for first time DB match Model Create or update db schema Run Seed Method Mismatch
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Get an Azure Account MSDN Subscriber – Activate MSDN benefits http://www.windowsazure.com/en- us/pricing/member-offers/msdn-benefits- details/?WT.mc_id=A443DD604 http://www.windowsazure.com/en- us/pricing/member-offers/msdn-benefits- details/?WT.mc_id=A443DD604 Windows Azure Free Trial – http://www.windowsazure.com/en- us/pricing/free-trial/?WT.mc_id=A443DD604 http://www.windowsazure.com/en- us/pricing/free-trial/?WT.mc_id=A443DD604
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Create a website in Azure 1. Open the Windows Azure Management Portal – https://manage.windowsazure.com/ https://manage.windowsazure.com/ – Click Web Sites – Click New
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Click Custom Create
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Enter unique URL (I used ContUNTPCUGTP) Region – use default Database – Select free 20 MB SQL DB Connection String Name – use SchoolContext Click arrow at bottom for Database Settings
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Database Settings Name – I used ContosoUniversityDB Server – select New SQL Server Login Name (remember these) – used for server admin Password – strong requires 3 – upper, lower,numeric, special char Region – leave default Click check to exit
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Deploy App from VS to Azure
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In Visual Studio Click project in Solution Explorer Click Publish
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Disclaimer VS has updated the dialog boxes since the MSDN tutorial was published. I used my MSDN subscription Azure benefits to access Azure; if you use a free subscription the dialogs may be different (Important) Remember to check the “Code First Migration” check box
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Connect to your Azure account If you haven’t connected to Azure through Visual Studio, you have to set up a profile to connect to your web site. Try to muddle through to get a connection set up until your Azure website appears in the dialog box below and following.
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Click Validate, then Next. Do not click Publish yet!
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Click the Execute Code First Migrations checkbox, then Next.
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Click the Start Preview button. This will display all files being sent to Azure.
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Now! Click Publish!
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Upon successful deployment, your website will be displayed. Note the URL. You can access the side directly on the web here.
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CONGRATULATIONS!!!
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