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The primary key of the Author class is the ID property (ThisKey) and the associated key in the BookAuthor is the Author property (OtherKey). We ll store the collection (Storage) in an EntitySet<BookAuthor> field called _BookAuthors. In case we wish to autogenerate the database from our class attribute metadata, we ll specify the name of the foreign key to be FK_BookAuthor_Author (Name). So far in this chapter we ve focused on the three main attributes Table, Column, and Attribute. Using these mapping structures, we can declaratively work with our objects using standard query expressions and allow the framework to automatically handle the data access plumbing for us. Directly embedding the mapping in our classes can be seen as a double-edged sword when it comes to code maintenance. When creating a business class, the developer is typically intimately aware of the relationships between the database and the object. Additionally, we can ensure that changes we make are not orphaned as we continue to enhance our system. However, when maintaining an application down the road, quickly locating the attributes can be difficult when interspersed throughout our code. Additionally, polluting our business code with the mapping information makes focusing on the core business requirements more difficult from a readability standpoint. A bigger issue with using attributes is that they are set at compile time. Breaking changes in our database s schema, including renaming or removing an existing column or table, will require us to rebuild the application in order to synchronize the components. If the attributes specify a mapping that no longer exists in the database, a run-time exception will likely arise. To handle both concerns, LINQ offers a second mapping mechanism using an external XML file.

Creating and Working with Simple Queries Note WeeklyRate and DailyRate are currency fields DateDiff returns an integer, and the result of an integer divide (\) or a modulus (Mod) operation is an integer Whenever you ask Access to evaluate an arithmetic expression, it returns a result that has a data type sufficiently complex to contain the result As you might expect, multiplying an integer (a simple data type) with a currency field (a more complex data type) returns a currency field You need to add this entire expression to the calculation for remaining days at the daily rate, so press Home again and add one more left parenthesis, and press the End key and click the right parenthesis button to complete this first part of the expression Click the addition operator to add it to your expression.

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Rather than scan back and forth to add parentheses as we build the second part of the expression, click the left parenthesis button twice to start building the calculation for extra days Add the DateDiff function again, click <<interval>>, and type "d" Click <<date1>>, find the CheckInDate field in tblReservations again and doubleclick it to add it to your expression Click <<date2>> and double-click the CheckOutDate field Remove <<firstweekday>> and <<firstweek>> from the function Now, you need to know how many days beyond full weeks are in the reservation You might be tempted to divide by 7 again and try to extract the remainder, but there s a handy operator that returns only the remainder of a division for you Mod Scan down in the left pane and click Operators In the middle pane, click Arithmetic to see only the arithmetic operators in the right pane.

Double-click Mod to add it to your expression We re almost done Type the number 7 and click the right parenthesis button to close the Mod calculation Click the multiply operator button, then go back to tblReservations and double-click the DailyRate field Click the right parenthesis button one last time to finish the expression Click OK to paste your result into the design grid Go ahead and add ReservationID, FacilityID, RoomNumber, CheckInDate, CheckOutDate, and TotalCharge to your query grid When you switch to Datasheet view, your result should look like Figure 7-22..

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Using XML files to specify mappings is similar to using attributes on classes. With XML mapping, the mapping file needs to be specified when instantiating the DataContext. Unlike attribute-based mappings, the XML mapping file can be dynamically changed without recompiling. Additionally, attributes can be removed from the business class definitions, which should facilitate focusing on the business requirements. XML mapping files also offer the added benefit of keeping our mappings in a central location, making maintenance of the mapping portions easier. We don t need to be concerned about learning an entirely different set of properties to use the external file. The XML mapping elements look similar to the attributes we ve already discussed. The amount of code that needs to be maintained is reduced. By using the XML mapping, we can eliminate the inline attributes on our class. Instead, we can use the file shown in listing 7.1 to map our Author object to the database.

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< xml version="1.0" encoding="utf-16" > <Database Name="lia" xmlns="http://schemas.microsoft.com/linqtosql/mapping/2007"> <Table Name="Author"> <Type Name="LinqInAction.LinqBooks.Common.Author"> <Column Name="ID" Member="ID" Storage="_Id" DbType="UniqueIdentifier NOT NULL" IsPrimaryKey="True" /> <Column Name="LastName" Member="LastName" DbType="VarChar(50) NOT NULL" CanBeNull="False" /> <Column Name="FirstName" Member="FirstName" DbType="VarChar(30)" /> <Column Name="WebSite" Member="WebSite" DbType="VarChar(200)" /> <Column Name="TimeStamp" Member="TimeStamp" DbType="rowversion NOT NULL" CanBeNull="False" IsDbGenerated="True" IsVersion="True" AutoSync="Always" /> </Type> </Table> </Database>

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