Home / Es adult cam / Before updating scaffolding from new db schema try creating a

Before updating scaffolding from new db schema try creating a black dating service woman

When we ran our application, EF 4.1 detected that the database didn’t exist and automatically created it for us – based on the Product and Category classes we defined earlier.To see the database, click the “Show All Files” icon at the top of Visual Studio’s “Solution Explorer” and add the “Store.sdf” database that was automatically created by EF to your project: You can then double-click the database to open it up in the Server Explorer – and expand the tables within it to see the schema that was created: Notice above how EF Code First automatically created the appropriate database schema based on the Category and Product classes we created earlier.NET MVC 3 Tools update adds a new assembly – assembly implements Entity Framework 4.1 – which we also released last month.EF 4.1 brings with it a bunch of great data API improvements to . EF Code First provides a really elegant and clean way to work with data, and enables you to do so without requiring a designer or XML mapping file.We’ll implement this using the code below: The “Store Context” class above is the Db Context class we are using to map our Product and Category classes to/from a database.It derives from the Db Context base class provided by EF Code First, and exposes two properties that correspond to tables within our database.

We configured our application to use a connection-string that pointed to a SQL CE database that (at the time) didn’t exist.This will execute our Categories Controller’s Index() method – which will list all categories in our database.Currently we don’t have any: Let’s click the “Create New” link to create a new category – this will navigate to the URL, which provides us with a form to create a new category: Clicking the “Create” button will post the form to our Categories Controller and add a new Category to our database.For example, you could add it within the \Models folder of your project – or within a separate class library project if you prefer to keep your data code separate.You’ll want to add a “using” statement to the classes).It will support listing products: As well as creating/editing new products (and categories): We can now build this entire application (and create the database that backs it) with ASP. We’ll use the “Internet Project” template – which will provide us with a default starter template for our application.When you look at the newly created project within the Solution Explorer, you’ll see that the ASP.EF Code First can handle automatically managing these associations (using the Primary Key/Foreign Key values), and can lazy load the appropriate data on-demand.Now that we’ve defined our two model classes, our next step will be to implement a “Db Context” class using EF code First that will map the model classes to tables in a database.For example, the “Product” class has a “Category” property that enables a developer to get access to the Category it belongs to.Likewise the “Category” class has a “Products” property that enables a developer to retrieve the Products that are within that particular Category.


  1. Oct 1, 2014. NET Scaffolding, you can create a web application that provides an interface to an existing database. The new column exists in the database table, but it does not currently exist in the data model class. After the update process is finished, the database diagram includes the new MiddleName property.

  2. Nov 23, 2015. @micball The second error indicates that our code is trying to create an index on a table that it doesn't know about. I could do with the results of the query I mentioned before - that's the query we run to look for the index columns. Plus, rather than changing your schema, I would like to try to figure out what is.

  3. Dec 1, 2014. Pre-existing SQL databases, particularly if complex, can often pose problems for software developers who are creating a new application. The data may be in. One warning about using importing scaffolding – Visual Studio threw a nasty error message when I first tried to import using the EntityFramework.

  4. Updated October 23, 2016. EF4.3 Onwards. This topic covers using Code First Migrations with an existing database, one that wasn't created by Entity Framework. Note It is important to follow the rest of the steps in this topic before making any changes to your model that would require changes to the database schema.

Leave a Reply

Your email address will not be published. Required fields are marked *