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Resources
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The Resources table will hold the data for the various resources that can be assigned to a project. The columns for this table are shown in Figure 3-22. Once again, the Id column is the primary key it s an int that is configured as an identity column using the Column Properties window. This table has now been given an identity key; the code in 18 will demonstrate how to support this concept within your business objects. As with the Description field in the Projects table, the LastName and FirstName columns allow null values even though they have no business meaning. Again, this is merely to illustrate how to build business objects to deal with real-world database designs and their intrinsic flaws.
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Figure 3-22. Making the Id column an identity column
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Finally, there s the Assignments table. A many-to-many relationship exists between projects and resources a project can have a number of resources assigned to it, and a resource can be assigned to a number of projects. The way you can represent this relationally is to create a link table that contains the primary keys of both tables. In this case, it will also include information about the relationship, including the date of the assignment and the role that the resource plays in the project, as shown in Figure 3-23. The first two columns here are the primary keys from the Projects and Resources tables; when combined, they make up the primary key in the link table. Though the Assigned column is of datetime type, null values are not allowed. This is because this value can t be empty a valid date is always required. The Role column is also a foreign key, linking back to the Roles table. The data in this table will be used to populate the ProjectResource and ResourceAssignment objects discussed earlier in the chapter.
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C HA PTER 3 OBJEC T-ORIE NTED APPLIC ATION DES IGN
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Figure 3-23. Design for the Assignments table This really drives home the fact that a relational model isn t the same as an object-oriented model. The many-to-many relational design doesn t match up to the object model that represents much of the same data. The objects are designed around normalization of behavior, while the data model is designed around normalization of data.
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Server Explorer in Visual Studio supports the creation of database diagrams, which are stored in the database. These diagrams not only illustrate the relationships between tables, but also tell SQL Server how to enforce and work with those relationships. Under the PTracker.mdf node in Server Explorer, there s a node for Database Diagrams. Rightclick this entry and choose New Diagram. Visual Studio will prompt you for the tables to be included in the diagram. Highlight all of them, and click Add and Close. The result is a designer window in which the tables are shown as a diagram. You can drag and drop columns from tables to other tables in order to indicate relationships. For example, drag and drop the Id field from Projects to the ProjectID field in the Assignments table. This will bring up a Tables and Columns dialog box, in which you can specify the nature of this relationship, as shown in Figure 3-24. Click OK to create the relationship.
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Figure 3-24. Creating a relationship between Assignments and Projects
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CH APT ER 3 O BJECT -O RIEN TED A PPLI CA TI O N D ESI GN
Do the same to link the Resources table to Assignments. You can also link the Roles table s Id column to the Role column in Assignments, thereby allowing the database to ensure that only valid roles can be added to the table. The resulting diagram should appear in a way that s similar to Figure 3-25. Save the diagram to the database, naming it PTrackerRelationships. VS .NET will then ask whether to update the tables. Remember that these relationships are reflected as formal constraints within the database itself, so this diagram directly impacts the database design.
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