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The primary rationale for F# quotations is to allow fragments of F# syntax to be executed by alternative means, for example, as an SQL query via LINQ or by running on another device such as a GPU or as JavaScript in a client-side web browser. F# aims to leverage heavy-hitting external components that map subsets of functional programs to other execution machinery. Another example use could be executing a subset of F# array code by dynamic generation of Fortran code and invoking a high-performance vectorizing Fortran compiler. The generated DLL would be loaded and invoked dynamically. This effectively means you can convert from a computational representation of a language (for example, regular F# functions and F# workflow expressions) to an abstract syntax representation of the same language. This is a powerful technique, because it lets you prototype using a computational model of the language (for example, sampling from a distribution or running queries against local data) and then switch to a more concrete abstract syntax representation of the same programs in order to analyze, execute, print, or compile those programs in other ways.

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A reference in Oracle is a pointer to an already existing object row in a table. This section presents a brief introduction to references. We will then discuss how we can access and manipulate data using references in JDBC.

Once you get your classes inheriting from the Serviced Component base class written and compiled, you ll need to configure them within the Component Services environment. You can be lazy or proactive about this. The lazy approach enables the runtime to do this the first time someone creates an instance of the type. Seriously, it s called lazy loading. The nice thing about this approach is that there s no additional setup or installation step that needs to occur. The first time the component is requested, the runtime makes sure the COM+ application exists and checks all of the other assembly-level attributes (such as role declarations) to make sure they re present as well. Anything that doesn t exist will be created. If the application already exists, it will be shut down and the changes applied. Components and their interfaces then get registered and configured with COM+. The best reason to use this type of registration is right in its name: laziness. This approach should be avoided if at all possible. The downside to lazy registration is that there s a significant performance hit on the first request to your application. Especially if your app is using queued components, this delay can last as long as a few seconds. The other, probably more serious, drawback is that the user running the process has to be an administrator to have the appropriate permissions to do this. So when you re running Serviced Components from ASP .NET, the user running the ASP .NET Framework must be configured as an administrator. This is usually a show stopper for folks, and leads them to your second option: registering the components yourself using a command line tool (seen with its options displayed in Figure 7-11).

Listing 9-11 shows a prototypical use of quotations, in this case to perform error estimation on F# arithmetic expressions. Listing 9-11. Error Analysis on F# Expressions Implemented with F# Quotations open Microsoft.FSharp.Quotations open Microsoft.FSharp.Quotations.Typed open Microsoft.FSharp.Quotations.Raw type Error = Err of float let rec errorEstimateAux t (env : Map<_,_>) = match t with | GenericTopDefnApp <@@ (+) @@> (tyargs,[xt;yt]) -> let x,Err(xerr) = errorEstimateAux xt env let y,Err(yerr) = errorEstimateAux yt env (x+y,Err(xerr+yerr)) | GenericTopDefnApp <@@ (-) @@> (tyargs,[xt;yt]) -> let x,Err(xerr) = errorEstimateAux xt env let y,Err(yerr) = errorEstimateAux yt env (x-y,Err(xerr+yerr)) | GenericTopDefnApp <@@ ( * ) @@> (tyargs,[xt;yt]) -> let x,Err(xerr) = errorEstimateAux xt env let y,Err(yerr) = errorEstimateAux yt env (x*y,Err(xerr*abs(x)+yerr*abs(y)+xerr*yerr)) | GenericTopDefnApp <@@ ( / ) @@> (tyargs,[xt;yt]) -> let x,Err(xerr) = errorEstimateAux xt env let y,Err(yerr) = errorEstimateAux yt env (x/y,Err(xerr*abs(x)+abs(1.0/y)/yerr+xerr/yerr)) | GenericTopDefnApp <@@ abs @@> (tyargs,[xt]) -> let x,Err(xerr) = errorEstimateAux xt env (abs(x),Err(xerr)) | Let((var,vet), bodyt) -> let varv,verr = errorEstimateAux vet env errorEstimateAux bodyt (env.Add(var.Name,(varv,verr))) | App(ResolvedTopDefnUse(info,Lambda(v,body)),arg) -> errorEstimateAux (MkLet((v,arg),body)) env

Note For more background on references, I refer you to Oracle Database Application Developer s Guide

Object Relational Features (10g Release 1).