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include the definition for the base table mappings. Thus, using a base framework for business objects may limit the ability to define mappings in the base class implementation, as each object will likely come from a different table. The second weakness in the LINQ to SQL inheritance model lies in the fact that the columns for the object s properties cannot cross multiple tables. It is not uncommon to have a set of database entities where a portion of the data, like a postal address, is included in a referential table. This may be fine from a relational database perspective, but including the address information within the entity class may fit better with the business model. Alternatively, the address information could be included within the same table as the entity s data, but having a shared Address class could offer better maintainability due to code reuse. In both cases (1 class encompassing 2 tables, and 2 classes pointing to the same table) LINQ to SQL fails to support a direct mapping structure at this time. In those cases, we need to look beyond LINQ to SQL and investigate another portion of the new data access stack the ADO.NET Entity Framework, which is scheduled to ship after the rest of the LINQ technologies. At this point, let s take a brief diversion into what this technology will offer us for more advanced mapping relationships.

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strSQL = "INSERT INTO tblContactProducts " & _ "(CompanyID, ContactID, ProductID, DateSold, SoldPrice) " & _ "VALUES(" & varCoID & ", " & Me.Parent.ContactID & ", " & _ lngProduct & ", #" & _ DateValue(Me.ContactDateTime) & "#, " & curPrice & ")" Attempt to insert the Product row CurrentDb.Execute strSQL, dbFailOnError Got a good add - inform the user MsgBox "The product you sold with this event " & _ "has been automatically added " & _ "to the product list for this user. " & _ "Click the Products tab to verify the price.", _ vbInformation, gstrAppTitle Requery the other subform to get the new row there Me.Parent.fsubContactProducts.Requery End If Insert_Exit: Exit Sub Insert_Err: Was error a duplicate row If Err = errDuplicate Then MsgBox "LawTrack Contacts attempted to auto-add " & _ "the product that you just indicated " & _ "that you sold, but the Contact appears " & _ "to already own this product. Be sure " & _ "to verify that you haven t tried to sell the same product twice.", _ vbCritical, gstrAppTitle Else MsgBox "There was an error attempting to auto-add " & _ "the product you just sold: " & _ Err & ", " & Error, vbCritical, gstrAppTitle Log the error ErrorLog Me.Name & "_FormAfterUpdate", Err, Error End If Resume Insert_Exit End Sub

In many cases, LINQ to SQL may serve the need for CRUD operations in our applications. As we ve already pointed out, direct table access can be insufficient. To accommodate this, LINQ to SQL allows access to extra processing power via stored procedures and user-defined functions in the database. Other times, the business model requires more complex entity structures than are available with one-to-one table to object data mappings. Frequently with larger database structures, the database will perform better with a more normalized structure. That normalized structure may or may not represent an optimal structure for our business entities. In those cases, we can flatten our table structures by using database views. Figure 8.9 illustrates such a case. In this example, we add one more table to our running database structure. This new table stores addresses. With it, we can store addresses for any number of associated tables. In figure 8.9, we show how the Address table can store information for both the Author and Publisher.

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