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// create the record and return it Some (FSharpValue.MakeRecord(t, values) : > 'a) else None // generate the sequence Seq.generate opener generator (fun r -> r.Dispose()) The first line of the sample uses a technique that you have not met before. Here, you explicitly declare your function s type parameter: let execCommand<'a> commandString : seq<'a> You do this so you can explicitly give the generic argument, 'a. The type parameter is then used to create a type object that you then reflect over: let t = typeof<'a> The function is designed to work with an F# record type, the fields of which exactly match the fields that result from the query. If this precondition is not met, then the code fails; however, such preconditions are typical in applications that use reflection in this way. Your previously defined function execCommand is generic, and you can use it with any query and matching record type. The following example shows how to apply it: open System open System.Windows.Forms open Strangelights.DataTools // a type that mirrors the type of row being created type Contact = { ContactID: Nullable<int>; NameStyle: Nullable<bool>; Title: string; FirstName: string; MiddleName: string; LastName: string; Suffix: string; EmailAddress: string; EmailPromotion: Nullable<int>; Phone: string;

Let s start by looking at the pygamejoystick module, which contains just five simple functions: pygamejoystickinit Initializes the joystick module This is called automatically by pygameinit, so you rarely need to call it yourself pygamejoystickquit Uninitializes the joystick module Like init, this function is called automatically and so is not often needed pygamejoystickget_init Returns True if the joystick module has been initialized If it returns False, the following joystick functions won t work pygamejoystickget_count Returns the number of joysticks currently plugged into the computer pygamejoystickJoystick Creates a new joystick object that is used to access all information for that stick The constructor takes the ID of the joystick the first joystick is ID 0, then ID 1, and so on, up to the number of joysticks available on the system.

// Build command string StringBuilder commandText = new StringBuilder("INSERT INTO Customers ("); commandText.Append("CustomerID, "); commandText.Append("UserName, "); commandText.Append("CompanyName, "); commandText.Append("Address, "); commandText.Append("City, "); commandText.Append("PostalCode, "); commandText.Append("Country, "); commandText.Append("Phone) VALUES ('"); commandText.Append(customerID); commandText.Append("', '"); commandText.Append(userName); commandText.Append("', '"); commandText.Append(companyName); commandText.Append("', '"); commandText.Append(address); commandText.Append("', '"); commandText.Append(city); commandText.Append("', '"); commandText.Append(postalCode); commandText.Append("', '"); commandText.Append(country); commandText.Append("', '"); commandText.Append(phoneNumber); commandText.Append("')"); dataCommand.CommandText = commandText.ToString(); int rows = dataCommand.ExecuteNonQuery(); // Make sure that the INSERT worked Assert.AreEqual(1, rows, "Unexpected Customers row count, gasp!"); dataConnection.Close(); } catch(Exception e) { Assert.Fail("Customers database error: " + e.Message); } }

PasswordHash: string; PasswordSalt: string; AdditionalContactInfo: string; rowguid: Nullable<Guid>; ModifiedDate: Nullable<DateTime> } // a form containing a data bound data grid let form = let temp = new Form() let grid = new DataGridView(Dock = DockStyle.Fill) temp.Controls.Add(grid) let contacts = execCommand<Contact> "select top 10 * from Person.Contact" let contactsArray = contacts |> Seq.to_array grid.DataSource <- contactsArray temp // show the form Application.Run(form) The most important line follows: let contacts = execCommand<Contact> "select top 10 * from Person.Contact" Here you have explicitly declared the type parameter for the generic function execCommand. The results from this example are the same as the previous example and are shown in Figure 9-2.

The first three functions in the joystick module are used in the initialization process and aren t often called manually The other two functions are more important because we will need them to find out how many joysticks are plugged into the computer and to create joystick objects for any of the sticks we want to use These joystick objects can be used to query information about the joystick as well as get the state of any buttons and the position of any analog sticks Here s how we might get the first joystick plugged into the computer: joystick = None if pygamejoystickget_count() > 0: joystick = pygamejoystickJoystick(0) This code uses a variable called joystick that will reference the first joystick It is set to None initially because it is possible that there are no joysticks plugged into the computer.

Note It has become common to use object-relational mappers, such as NHibernate, to perform this kind of task. These tools provide a high degree of flexibility, but they tend to rely on features that are idiomatic to C#. You can make them work with F#, but the experience is not great. This is why I chose not to include any information on them in this book. Efforts are underway, by myself and others, to rectify this problem; meanwhile, I recommend keeping an eye on my blog for more information: http://strangelights.com/blog.

private void RemoveCustomer() { try { OdbcConnection dataConnection = new OdbcConnection(); dataConnection.ConnectionString = DataUtilities.ConnectionString; dataConnection.Open(); OdbcCommand dataCommand = new OdbcCommand(); dataCommand.Connection = dataConnection; // Build command string StringBuilder commandText = new StringBuilder("DELETE FROM Customers WHERE CustomerID = '"); commandText.Append(customerID); commandText.Append("'"); dataCommand.CommandText = commandText.ToString(); int rows = dataCommand.ExecuteNonQuery(); // Make sure that the DELETE worked Assert.AreEqual(1, rows, "Unexpected Customers row count, gasp!"); dataConnection.Close(); } catch(Exception e) { Assertion.Assert("Customers database error: " + e.Message, e.Message.Equals("")); } } } }