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Very large flat file and nonrelational databases can be slow to open, tough to search in for specific data records, and prone to data-entry errors and data corruption There are two main benefits to using relational databases vs nonrelational databases The first benefit of using relational databases is the efficient use of database space Using the example of the nonrelational database in the preceding section, there would be a lot of repeated customer names and addresses and therefore increased wasted space The second benefit of using relational databases is the reduction of data-entry errors Duplicating data can increase the probability of data-entry errors every time you retype the same customer names and addresses Once you remove the repeated customer names and addresses to a separate data table in a relational database, you can update the customer names and addresses in just one table.

let two = (printfn "Hello World"; 1+1) let four = two + two When executed, this code prints Hello World precisely once, when the right side of the definition of two is executed. F# doesn t have statements as such: the fragment (printfn "Hello World"; 1+1) is an expression, but when evaluated, the first part of the expression causes a side effect, and its result is discarded. It s also often convenient to use parentheses to delimit sequential code. The code from the script could in theory be parenthesized with a semicolon added to make the primitive constructs involved more apparent: (printfn "--> %d words in the text" numWords; printfn "--> %d duplicate words" numDups)

Note The token ; is used to write sequential code within expressions, and ;; is used to terminate interactions

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'password'=>md5($user_password), 'version'=>'.01'), 'application_name'=>'SoapTest')); $session = $result['id']; // Add the new record $result = $soapclient->call('set_entry',array('session'=>$session,'module_name'=> 'Contacts', 'name_value_list'=>array(array('name'=>'last_name' , 'value'=>"Mertic"), array('name'=>'first_name' , 'value'=>'John')))); $id = $result['id'];

with the F# Interactive session. Semicolons are optional when the individual fragments of your sequential code are placed on separate lines beginning at the same column position.

To declare relationships among data tables and cross-reference related data records in separate data tables to each other in a relational database, you use primary keys and foreign keys A primary key is a data field containing a unique identifier such as a sequential number, a part number, a customer ID, or a Social Security number applied to each data record in the main table, also known as the primary-key data table A foreign key then is a data field in the related table, also known as the foreign-key data table, containing the unique identifier from the related data record in the primary-key data table.

Using .NET Libraries from F#

The true value of F# lies not just in what you can do inside the language but also in what you can connect to outside the language. For example, F# doesn t come with a GUI library. Instead, F# is connected to .NET and via .NET to most of the significant programming technologies available on major computing platforms. You ve already seen one use of the .NET libraries, in the first function defined earlier: /// Split a string into words at spaces let splitAtSpaces (text: string) = text.Split ' ' |> Array.toList Here, text.Split is a call to a .NET library instance method called Split defined on all string objects. To emphasize this, the second sample uses two of the powerful libraries that come with the .NET Framework: System.Net and System.Windows.Forms. The full sample is in Listing 2-3 and is a script for use with F# Interactive. Listing 2-3. Using the .NET Framework Windows Forms and Networking Libraries from F# open System.Windows.Forms let form = new Form(Visible=true,TopMost=true,Text="Welcome to F#") let textB = new RichTextBox(Dock=DockStyle.Fill, Text="Here is some initial text") form.Controls.Add textB open System.IO open System.Net /// Get the contents of the URL via a web request

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