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19, Designing F# Libraries, gives our advice on methodology and design issues for writing libraries in F#. You will learn how to write vanilla .NET libraries that make relatively little use of F# constructs at their boundaries in order to appear as natural as possible to other .NET programmers. We will then cover functional programming design methodology and how to combine it with the object-oriented design techniques specified by the standard .NET Framework design guidelines. The appendix, F# Brief Language Guide, gives a compact guide to all key F# language constructs and the key operators used in F# programming. Because of space limitations, we have only partially addressed some important aspects of programming with F#. It is easy to access hundreds of other libraries with F# that are not covered in this book, including Managed DirectX, Windows Presentation Foundation (WPF), Windows Communication Foundation (WCF), Windows Workflow Foundation (WWF), Irrlicht, the Mono Unix bindings, the Firebird.NET database bindings, several advanced SQL Server APIs, and mathematical libraries such as Extreme Optimization and NMath. There are also hundreds of open-source projects related to .NET programming, some with a specific focus on F#. F# can also be used with alternative implementations of the CLI such as Mono and Silverlight, topics we address only tangentially in this book. Quotation meta-programming is described only briefly in 9, and some topics in functional programming such as the design and implementation of applicative data structures are not covered at all. Also, some software engineering issues such as performance tuning are largely omitted. Many of these topics are addressed in more detail in Foundations of F# by Robert Pickering, also published by Apress.

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Note that using the rowdependencies option does cause the row size to increase by 6 bytes due to additional information maintained at the row level As of 10g Release 1, the use of ora_rowscn has a few restrictions you should be aware of You cannot use ora_rowscn in a query to a view However, you can use it to refer to the underlying table when creating a view To understand this, create a view, v1, on table t1: scott@ORA10G> create or replace view v1 as 2 select x 3 from t1; View created If you try to select ora_rowscn from it, you will get an error: scott@ORA10G> select ora_rowscn from v1; select ora_rowscn from v1 * ERROR at line 1: ORA-00904: "ORA_ROWSCN": invalid identifier However, you can refer to ora_rowscn in the view definition itself to overcome this restriction.

The simplest concrete type definitions are records. Here s our first example: type Person = { Name: string; DateOfBirth: System.DateTime; } You can construct record values simply by using the record labels: > { Name = "Bill"; DateOfBirth = new System.DateTime(1962,09,02) };; val it : Person = { Name="Bill"; DateOfBirth = 09/02/1962 } You can also construct record values by using the following more explicit syntax, which names the type should there be a conflict between labels amongst multiple records: > { new Person with Name = "Anna" and DateOfBirth = new System.DateTime(1968,07,23) };; val it : Person = { Name="Anna"; DateOfBirth = 23/07/1968 } Record values are often used to return results from functions: type PageStats = { Site: string; Time: System.TimeSpan; Length: int; NumWords: int; NumHRefs: int } This technique works well when returning a large number of heterogeneous results: let stats site = let url = "http://" + site let html,t = time (fun () -> http url) let hwords = html |> getWords let hrefs = hWords |> List.filter (fun s -> s = "href") { Site=site; Time=t; Length=html.Length; NumWords=hwords.Length; NumHRefs=hrefs.Length } Here is the type of stats:

security technologies. If you require a full treatment of the topics we ve just outlined (including Code Access Security), consult .NET Security by Bock et al (Apress, 2002).

The view v2 is created with the ora_rowscn pseudo column values as one of its columns: scott@ORA10G> create or replace view v2 as 2 select x, ora_rowscn 3 from t1; View created..

Here is how F# Interactive shows the results of applying the function:

Note Since a deleted row will not get selected if we requery using a rowid, we can conclude that JDBC

Many .NET developers assume that the only reason to assign a strong name to a .NET assembly is to deploy it to the Global Assembly Cache (GAC) as a shared assembly. While this is one

> stats "www.live.com";; val it : PageStats = { Site="www.live.com"; Time=0.872623628; Length=7728, NumWords=1156; NumHRefs=10; }

internally does not update its cache for a deleted row, even though the query would not fetch that row.