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Members of our club =================== Steven Keller is a Teen member, phone: unavailable Margret Jones is an Adult member, phone: 913 294-6059 Roland Park is a Senior member, phone: 816 353-4458 It is important to note here that no design time or even runtime checking is done to verify the ages for the derived types. It is entirely possible to create an instance of the Teen type and set the age property to 74 clearly not a teen. On the retrieval side, however, this row will be materialized as a Senior member; a situation likely offensive to our Teen member. We can introduce validation before changes are committed to the data store. To do this, register for the SavingChanges event when the context is created. We wire this event to our code that performs the validation. This code is shown in Listing 6-23. Listing 6-23. Handling validation in the SavingChanges event public partial class EFRecipesEntities { partial void OnContextCreated() { this.SavingChanges += new EventHandler(Validate); } public void Validate(object sender, EventArgs e) { var entities = this.ObjectStateManager .GetObjectStateEntries(EntityState.Added | EntityState.Modified) .Select(et => et.Entity as Member); foreach (var member in entities) { if (member is Teen && member.Age > 19) { throw new ApplicationException("Entity validation failed"); } else if (member is Adult && (member.Age < 20 || member.Age >= 55)) { throw new ApplicationException("Entity validation failed"); } else if (member is Senior && member.Age < 55) { throw new ApplicationException("Entity validation failed"); } } } }

Here s the procedure for using a vector to define an environmental boundary:

A property list is made up of keys. In the above example, we did not specify any keys. The dscl command created the record and, therefore, a file in the form of the corpadmin.plist file has manifested in /var/db/dslocal/nodes/Default/users. In order for the corpadmin account to be viable, we now need to create a number of keys that tell the directory services daemon about this user. These keys make up the attributes for the account. A list of commonly used user attributes can be seen in Table 1-1.

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In Listing 6-23, when SaveChanges() is called, our Validate() method checks each entity that has either been added or modified. For each of these, we verify that the age property is appropriate for the type of the entity. When we find a validation error, we simply throw an exception. We have several recipes in 12 that focus on handling events and validating objects before they are committed to the database.

6. Create a vector to use as an environmental boundary. This will be vector v2. 7. Create a vector between a game object (like the center of a space ship) and v2 s point

An integer id unique to this user. Denotes the primary group of the user. A universally unique identifier for the user. Absolute path to the user s home directory. The user s full name. The user s short name. The user s default shell.

You have two or more tables with similar schema and data and you want to model these tables as types derived from a common entity using Table per Concrete Type inheritance.

8. Find the dot product of v3 and v2 s left normal (v2.ln).

To create our own user by hand, we will need to assemble the required attributes, let s enter what in the Account add screen from the Accounts System Preference pane would be the Name: field: RealName. We will use the create the key to do this. Because there is a space in our name, let s put what will go into the record in quotes:

Let s assume we have the tables shown in Figure 6-32.

dp = v3.vx * v2.ln.dx + v3.vy * v2.ln.dy; If the dot product is less than zero, you know that the game object has crossed with the environmental boundary (v2).

> -create /Local/Default/Users/corpadmin RealName "Corporate Administrator"

Figure 6-32. Tables Toyota and BMW with similar structure that will become derived types of the Car entity In Figure 6-32, the tables Toyota and BMW that have similar schema and represent similar data. The BMW table has an additional column with a bit value indicating whether the instance has the collision avoidance feature. We want to create a model with a base entity holding the common properties of the Toyota and BMW tables. Additionally, we want to represent the one-to-many relationship between the car dealer and cars he holds in inventory. Figure 6-33 shows the final model. To create the model, do the following: 1. 2. 3. Add a new ADO.NET Entity Data Model to your project and import the Toyota, BMW, CarDealer, and Dealer tables. Right-click the design surface and select Add Entity. Name the new entity Car and unselect the Create key property check box. Right-click the Car entity and view its properties. Set the Abstract property to true.

Find the dot product between v3 and v2.ln, as shown in the previous section. The game object needs a motion vector called v1. Multiply the absolute value of the dot product by v1 s unit vector. This produces a collision vector. collisionForce_Vx = v1.dx * Math.abs(dp); collisionForce_Vy = v1.dy * Math.abs(dp);

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