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Connections are the fundamental abstraction needed in a data access technology. A Connection object deals with the underlying technical details of establishing a network path of communication with the database server, and is also responsible for presenting the credentials of the user requesting the data to the database. This is one of the most expensive parts of communicating with the database, and is, therefore, one of the most critical resources in data access technology. For this reason, an environment that establishes a pool of connections to the database is usually desired, so that each request for data does not have to incur the overhead of knocking on the door of the database, making an introduction, and getting permission to come in and wander around.

the real work of persisting objects to the database. Once the changes have been successfully committed, we can delete the resume files. There are a couple of possible variations worth noting. We could wrap both our call to SaveChanges() and the file deletions in a transaction to ensure that both either succeed or fail together. Another variation is to use the DetectChangesBeforeSave SaveOption in our call to SaveChanges(). This option preserves the tracking information in the object context and would allow us to move the query for deleted objects to somewhere after the call the SaveChanges(). To clear the tracking information, we would need to call AcceptAllChanges() before we leave the method. Entity Framework does not expose insert, update, and delete events for each entity. However, much of what we would do in these events can be handled, as we have demonstrated here, by overriding the SaveChanges() method.

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*/ [Test] public function checkOutDateEarlierThanCheckinDate(): void { } /** * Validation should fail on the dates passed in. * Input: Check-in date: Today * Check-out date: Today * Acceptance Criteria: The dates are rejected as invalid */ [Test] public function checkOutDateSameAsCheckinDate(): void { } /** * Validation should succeed for the dates passed in: * Check-out date is later than the check-in date, * and the check-in date is later than yesterday * Input: Check-in date: Today * Check-out date: Tomorrow * Acceptance Criteria: The dates are accepted */ [Test] public function checkGoodDates(): void { } } Notice how each test method is headed-up with the test scenario details from the model. When you start to write each test, this information acts as a perfect reminder of what the test is intended to achieve, what the inputs should be, and the expected outcome that you ll need to test for. Because these tests have been driven comprehensively from the use cases themselves, you ll also have the confidence that these tests span a complete enough picture of the system behavior. Now that the test classes are generated, you ll want to fill in the details the actual test code. Let s do that next.

Let s say you have a model with a User entity. The User entity has properties for the full name and user name for the user. You have a business rule that says each user must have a UserName greater than five characters long. You want to enforce this business rule with code that sets the IsActive property to false if the UserName is set to a string less than or equal to five characters; otherwise the IsActive flag is set to true. The model is shown in Figure 12-2.

Connection pooling is implemented by the Managed Providers of data access The discussion in the section pertains to the SQL- and Oracle-managed providers from Microsoft The ODBCand OLEDB-managed providers are backwards compatibility layers, and so rely on the native pooling functionality provided by the driver or provider, respectively Connections are established on a per-user basis That is, two different users cannot share a connection to the database This is true whether you re using integrated security or a database-specific security model This works fine when a web application is executing as a dedicated user (such as ASPNET, the user the ASP NET Framework runs as by default) When you re using impersonation and integrated security, though, code is executed with the credentials of the user that has requested the page This leaves connection pools virtually useless, which can seriously impair the scalability of your application.

Having generated the classes, you can move on to implementing the tests. When doing that, use the test comments to help yourself stay on course. Let s look at the first generated test function, checkInDateEarlierThanToday(): /** * Validation should fail on the dates passed in. * * Input: Check-in date: Yesterday * Check-out date: Any * Acceptance Criteria: The dates are rejected as invalid */

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