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identifies the specific entity type associated with each row, and each entity in the hierarchy is given a unique value to store in this column. By default, the discriminator value for an entity is its entity name, although an entity may override this value using the @DiscriminatorValue annotation. This approach performs well for querying, since only a single table is involved, and if your type hierarchy can abide by the practical limitations, this is probably the best approach to use. Figure 4-2 shows a diagram of a schema that maps our example entities using the SINGLE_TABLE strategy. We have chosen to prefix these tables with CH04_ST_ to avoid conflicts with the PERSON and ADDRESS tables in our example schema that are used by the full Enterprise Wines Online application.

You should notice a new Host choice on the menu bar. Click this, and choose SQL. You should get a blank SQL page like the one shown in Figure 7-5.

Figure 4-2. The CH04_ST_PERSON table holds all entity instances in the entity hierarchy rooted by Person. The CH04_ST_ADDRESS table holds the associated Address instances.

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This page is given to you by DNN as a way to execute SQL scripts. The SQL code is also given to you. You just need to find it and copy it in here. In the Solution Explorer, choose DesktopModules TimePunch, and double-click the TimePunch.SqlDataProvider file. This will open it in the IDE. If you aren t familiar with SQL table definitions, this code will be ugly and scary for you. Don t worry, though. It does actually make sense. Since you will make changes to this code later, I will explain it then. Press Ctrl+A to select all lines in this file, and press Ctrl+C to copy it. Go back to your SQL page on the web site, and press Ctrl+V inside the text window to paste all the code in here. Figure 7-6 shows this.

An upcoming events view that lists the title and date for upcoming events, sorted by the event start date in ascending order. I ll use an argument to filter the events by targeted audience. If there isn t an argument, I ll list all upcoming events. If there is an argument, I ll restrict the items to only those events that match the argument. I ll also use Drupal s content scheduling feature to unpublish events after the event date has passed.

All the properties across the entity hierarchy rooted by the Person entity map to columns on a single table, CH04_ST_PERSON. This table holds a foreign key reference, bound to the HOME_ADDRESS column, to CH04_ST_ADDRESS, which is mapped to the Address entity. This column also has a unique key constraint, ensuring that each row in the CH04_ST_ADDRESS table corresponds to, at most, one row in the CH04_ST_PERSON table. It also holds a foreign key reference, using the MANAGER column, back to itself. This foreign key is not constrained to be unique, indicating that multiple rows may hold the same value in their MANAGER column.

Listings 4-1 through 4-4 show how the entities in the Person hierarchy are mapped using the SINGLE_TABLE inheritance strategy. The strategy is declared on the root entity in the hierarchy, and applies to all subentities in the hierarchy as well. Annotations introduced in the example entities that have not yet been covered are explained in the sections that follow.

Make sure that the Run as Script check box is checked, and click the Execute link. This executes the SQL table code and builds new tables to support this new module.

1. 2. 3. 4. 5. 6. 7. Title = Upcoming events Rowstyle = fields Fields = node title and event start date Sort criteria = start date in ascending order Arguments = taxonomy term for visitor type Filters = node type of event Block display created so I can place this view in the sidebar of the site Title = Upcoming events Rowstyle = nodes using the Full node option Sort criteria = event start date in ascending order Filters = node type of event Page display using a URL of upcoming events Title = Resources Rowstyle = nodes using the teaser option Sort criteria = resource category (taxonomy term) and title in ascending order Filters = node type of resource Page display using a URL of resources

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