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The ADO.NET Entity Framework (EF) is a programming model that attempts to lessen the gap between database constructs and object-oriented programming constructs. Using EF, you can interact with a relational database without ever seeing a line of SQL code (if you so choose). Rather, when you apply LINQ queries to your strongly typed classes, the EF runtime generates proper SQL statements on your behalf.

Figure 7-2. The content type appears on the page at http://example.com/node/add. If you do not wish to have the direct link added, you could remove it by using hook_menu_alter(). For example, the following code would remove the page for anyone who does not have administer nodes permission. /** * Implements hook_menu_alter(). */ function job_post_menu_alter(&$callbacks) { // If the user does not have 'administer nodes' permission, // disable the job_post menu item by setting its access callback to FALSE. if (!user_access('administer nodes')) { $callbacks['node/add/job_post']['access callback'] = FALSE; // Must unset access arguments or Drupal will use user_access()

Note LINQ to Entities is the term that describes the act of applying LINQ queries to ADO.NET EF entity objects.

Another possible approach: Rather than updating database data by finding a row, updating the row, and sending the row back for processing with a batch of SQL queries, you can simply change properties on an object and save its state. Again, the EF runtime updates the database automatically. As far as Microsoft is concerned, the ADO.NET Entity Framework is a new member of the data access family, and it is not intended to replace the connected or disconnected layers. However, once you spend some time working with EF, you might quickly find yourself preferring this rich object model over the more primitive world of SQL queries and row/column collections. Nevertheless, chances are you will find uses for all three approaches in your .NET projects; in some cases, the EF model might complicate your code base. For example, if you want to build an in-house application that needs to communicate only with a single database table, you might prefer to use the connected layer to hit a batch of related stored procedures. Larger applications can particularly benefit from EF, especially if the development team is comfortable working with LINQ. As with any new technology, you will need to determine how (and when) ADO.NET EF is appropriate for the task at hand.

3. 4.

Note You might recall a database programming API introduced with .NET 3.5 called LINQ to SQL. This API is close in concept (and fairly close in terms of programming constructs) to ADO.NET EF. While LINQ to SQL is not formally dead, the official word from those kind folks in Redmond is that you should put your efforts into EF, not LINQ to SQL.

The strongly typed classes mentioned previously are called entities. Entities are a conceptual model of a physical database that maps to your business domain. Formally speaking, this model is termed an Entity Data Model (EDM). The EDM is a client-side set of classes that map to a physical database, but you should understand that the entities need not map directly to the database schema in so far as naming conventions go. You are free to restructure your entity classes to fit your needs, and the EF runtime will map your unique names to the correct database schema. For example, you might recall that you created the simple Inventory table in the AutoLot database using the database schema shown in Figure 23-1.

Figure 23-1. Structure of the Inventory table of the AutoLot database If you were to generate an EDM for the Inventory table of the AutoLot database (you ll see how to do so momentarily), the entity will be called Inventory by default. However, you could rename this class to Car and define uniquely named properties of your choosing, which will be mapped to the columns of the Inventory table. This loose coupling means that you can shape the entities so they closely model your business domain. Figure 23-2 shows such an entity class.

The resulting URL is http://example.com/index.php q=foo/bar. Drupal treats foo/bar as the internal Drupal path, and processing begins in index.php.