Let s take a look at how this F# type will appear to a programmer using C# or another .NET library. The approximate C# signature is as follows: // C# signature for the unadjusted APoint class of Listing 19-1 public class APoint { public APoint(); public APoint(double angle, double radius); public static Microsoft.FSharp.Collections.List<APoint> Circle(int count); public APoint Stretch(double factor); public APoint Warp(Microsoft.FSharp.Core.FastFunc<double,double> transform); public double Angle { get; } public double Radius { get; } } There are some important points to notice about how F# has chosen to represent constructs here. For example: Metadata such as argument names has been preserved. F# methods that take two arguments become C# methods that take two arguments. Functions and lists become references to corresponding types in the F# library. The full rules for how F# types, modules, and members are represented in the .NET Common Intermediary Language are explained in the F# language reference on the F# website. To make a .NET component, we place it in a file component.fs and compile this code into a strong-name signed DLL using the techniques from 7: C:\fsharp> sn -k component.snk C:\fsharp> fsc a component.fs --version --keyfile component.snk Figure 19-1 shows the results of applying the Microsoft FxCop tool to check this assembly for compliance with the .NET Framework Design Guidelines. Figure 19-1 reveals a number of problems with the assembly. For example, the .NET Framework Design Guidelines require the following: Types must be placed in namespaces. Public identifiers must be spelled correctly. Additional attributes must be added to assemblies related to .NET Security and Common Language Specification (CLS) compliance.

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} } }// end of program The output of the program is as follows: >java DemoUpdatability URL:jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(PORT=1521) (HOST=rmenon-lap))(CONNECT_DATA=(SID=ora10g))) Inside _demoScrollInsensitiveUpdatable Result set category (using Statement API): Scroll insensitive, Updatable Result set category (using ResultSet API): Scroll insensitive, Updatable Moving to row where I was before inserting The row where I was before inserting: 3 Inside _demoScrollSensitiveUpdatable Result set category (using Statement API): Scroll sensitive, Updatable Result set category (using ResultSet API): Scroll sensitive, Updatable Before delete current row number 4 has value: 5 After delete current row number 3 has value: 31

Note Output caching has been a feature of the ASP.NET Framework since version 1.0. If you re not familiar with it, please see the SDK documentation on it. We don t give it full coverage in this section, as this is about the new feature of ASP.NET 2.0, post-cache substitution.

Figure 19-1. Running FxCop on the code from Listing 19-1 Listing 19-2 shows how to adjust this code to take these things into account. Listing 19-2. An F# Type After Adjustment for Use As Part of a Vanilla .NET API #light namespace ExpertFSharp.Types open System open System.Security.Permissions [<assembly: SecurityPermission(SecurityAction.RequestMinimum, Execution = true); assembly: System.Runtime.InteropServices.ComVisible(false); assembly: System.CLSCompliant(true); assembly: PermissionSet(SecurityAction.RequestOptional, Name = "Nothing")>] type RadialPoint(angle,radius) = member x.Angle = angle member x.Radius = radius member x.Stretch(factor) = RadialPoint(angle=x.Angle, radius=x.Radius * factor) member x.Warp(transform:Converter<_,_>) = RadialPoint(angle=transform.Invoke(x.Angle), radius=x.Radius) static member Circle(count) = seq { for i in 1..count -> RadialPoint(angle=2.0*Math.PI/float(count), radius=1.0) } new() = RadialPoint(angle=0.0, radius=0.0)

Whether you perform an update using the standard update statement or you use the update capability of a result set, JDBC (or Oracle) does not guarantee that someone else has not modified the row since the query was executed. Please see the section Lost Updates of 16 to read up on how to resolve the situation where your update operation conflicts with another transaction s DML operation.

The inferred F# type of the code in Listing 19-2 is as follows: type RadialPoint = new : unit -> RadialPoint new : angle:double * radius:double -> RadialPoint static member Circle : count:int -> seq<RadialPoint> member Stretch : factor:double -> RadialPoint member Warp : transform:SystemConverter<double,double> -> RadialPoint member Angle : double member Radius : double The C# signature is now as follows: // C# signature for the unadjusted APoint class of Listing 19-2 public class RadialPoint { public RadialPoint(); public RadialPoint(double angle, double radius); public static SystemCollectionsGenericIEnumerable<RadialPoint> Circle(int count); public RadialPoint Stretch(double factor); public RadialPoint Warp(SystemConverter<double,double> transform); public double Angle { get; } public double Radius { get; } } The fixes we have made to prepare this type for use as part of a vanilla NET library are as follows: We added several attributes as directed by the FxCop tool.

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