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LINQ to SQL is designed to allow data access to relational databases. It does this through a combination of code generation and the ability to quote code. For the code generation, LINQ to SQL provides a tool called SqlMetal.exe, which will generate a code version of your relational database; this code version of your database is an object model where the tables become classes with properties representing their columns. Quoting code means the ability to have the compile transform a section of code into data structure called an expression tree; you first came across this technique in 6, but this is the first time you will see it put into real use. The quoted code will be transformed into SQL that can then be executed on the database. The first step in working with LINQ to ADO.NET is to generate a code version of your database. To do this, you would use the following command line, which generates a code version of the AdventureWorks database that is running on the local version of SQL Server Express: SqlMetal.exe /server:.\SQLEXPRESS /database:AdventureWorks /code:AdWorks.cs /language:csharp The C# classes that represent the database s objects are generated, but you do not need to know C# to work with it, because you only ever use a compiled version of the code, just like using any other .NET library. This example relies on an example LINQ library distributed with F# that you can find in the \samples\fsharp\FLinq directory of the distribution. This library also provides useful functions that your DLINQ library requires; first it imports the .NET methods, and then it transforms them into F# methods. The other function it provides is to transform the F# expression trees into the trees used by DLINQ. The library is distributed as a sample, rather than being integrated into the

done this a thousand times who can advise us. We have a good lawyer. We re looking for a mentor who doesn t have ulterior motives and who is aligned with our interests.

Livingston: Which also must be a problem since you are so well known. Some people must think, This is my ticket! Ross: I can t tell you how many times I get an email from someone who just

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The last task of the view is to react to changes in the model and to user actions (by changing the selection, for example). The methods dataChanged and selectionChanged react to these events by updating the text shown using updateText. You can see the implementation of the two methods in Listing 5-22. Listing 5-22. Reacting to changes in the model and the selection void SingleItemView::dataChanged( const QModelIndex &topLeft, const QModelIndex &bottomRight ) { updateText(); } void SingleItemView::selectionChanged( const QItemSelection &selected, const QItemSelection &deselected ) { updateText(); } Using the custom view is just as simple as using one of the views shipped with Qt. Listing 5-23 shows how it can look (populating the model has been left out). A QStandardItemModel is used and populated using a pair of nestled for loops. As you can see, using the view and sharing the selection model is very easy. (The application can be seen in Figure 5-7.)

wants to have dinner. So we ll have dinner, and we ll chat about politics, the weather, whatever. Then we ll have dinner again, and slowly it comes out that they want something. Eventually you find out that they want to come work for you, or they want to . . . sometimes they don t even know what they want, but they know they want something. It s hard to see what people s intentions are at the beginning. We re also overly paranoid because the first thing we did when we started the company was talk to a bunch of entrepreneurs who told us, Don t tell anyone what you are doing. VCs are sharks. Meanwhile, you hear from the VCs, You re too paranoid. So it s hard to find the right balance and be human, because you don t know who s genuine and who s not.

F# libraries, because the F# team did not want to introduce a binary dependency onto something as experimental as LINQ. Once LINQ is released and part of the .NET Framework, the functionalities provided by this sample library will be migrated into the F# libraries. The following example shows how to use DLINQ in F#. It shows two powerful features of DLINQ: the ability to have your F# code transformed into a SQL query and the ability to create instances of rows without having to use reflection, like you did for the data binding example earlier in the chapter: #light #r "Microsoft.Practices.EnterpriseLibrary.Data.dll";; #r "flinq.dll";; #r "AdventureWorks.dll";; #r "System.Data.DLinq.dll";; #r "System.Query.dll";; open open open open System.Windows.Forms Microsoft.FSharp.Quotations.Typed Microsoft.FSharp.Bindings.DLinq.Query Microsoft.Practices.EnterpriseLibrary.Data

Listing 5-23. Using the single item view together with a table view int main( int argc, char **argv ) { QApplication app( argc, argv ); QTableView *table = new QTableView; SingleItemView *selectionView = new SingleItemView; QSplitter splitter; splitter.addWidget( table ); splitter.addWidget( selectionView ); ... table->setModel( &model ); selectionView->setModel( &model ); selectionView->setSelectionModel( table->selectionModel() ); splitter.show(); return app.exec(); }

Livingston: It must be frustrating not to be able to share your idea. Ross: Incredibly. If you ever want to stop a conversation dead in its tracks, just

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