.NET/Java PDF, Tiff, Barcode SDK Library

The following demonstrates that two terms have equivalent NNF normal forms: > let t1 = Not(And(Not(Var("x")),Not(Var("y"))));; val t1 : Prop > fsi.AddPrinter(showProp);; > t1;; val it : Prop = not (not x && not y) > let t2 = Or(Not(Not(Var("x"))),Var("y"));; val t2 : Prop > t2;; val it : Prop = not (not x) || y > (t1 = t2);; val it : bool = false > NNF t1;; val it : Prop = x || y > NNF t2;; val it : Prop = x || y > NNF t1 = NNF t2;; val it : bool = true

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Caution As of 10g Release 1, the Oracle JDBC implementation of scrollable and updatable result sets

This chapter focuses solely on the System.Web.UI.Page class, the fundamental type for Web Form programming. Here we peel the covers back on this type, and examine its internal structure: the control tree, which is fundamental to all ASPX request processing. We ll also show you some changes that have been made to this model in ASP.NET 2.0, including a new compilation model, new deployment options, and some new events available in the lifetime of the page-request processing.

In 3 we introduced a useful notation for generating sequences of data, called sequence expressions. For example: > seq { for i in 0 .. 3 -> (i,i*i) };; val it : seq<int * int> = seq [ (0,0); (1,1); (2,4); (3,9) ] Sequence expressions are used extensively throughout this book. For example, in 15 we will use sequence expressions for queries that are executed on a database. It turns out that sequence expressions are just one instance of a more general construct called computation expressions. These are also called workflows, though they bear only a passing similarity to the workflows used to model business processes. The general form of a computation expression is builder { comp-expr }. Table 9-2 shows the primary constructs that can be used within the braces of a computation expression and how these constructs are de-sugared by the F# compiler given a computation expression builder b.

In all the preceding methods, the first parameter, resultSetType, determines the scrollability and sensitivity of the result set, and the second parameter, resultSetConcurrency, determines if the result set is updatable or read-only. You can specify one of the following constants defined in the ResultSet interface to set the scrollability/sensitivity attribute of the result set: ResultSet.TYPE_FORWARD_ONLY (the default) ResultSet.TYPE_SCROLL_INSENSITIVE ResultSet.TYPE_SCROLL_SENSITIVE You can specify one of the following constants in the ResultSet interface to set the updatability attribute of the result set: ResultSet.CONCUR_READ_ONLY (the default) ResultSet.CONCUR_UPDATABLE

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The three most important applications of computation expressions in F# programming are as follows: General-purpose programming with sequences, lists, and arrays Parallel, asynchronous, and concurrent programming using asynchronous workflows, discussed in detail in 13 Database queries, by quoting a workflow and translating it to SQL via the .NET LINQ libraries, a technique we ll show how to use in 15 In this section, we cover briefly how computation expressions work through some simple examples.

There are several limitations in the Oracle implementation of the result set s scrollability and updatability features to keep in mind. From a performance point of view, an important factor to consider is that scrollable/updatable result sets necessarily require a client-side cache. This means that if your result set contains many rows, many columns, or large columns, then it can have a severe performance impact on the JDBC application due to high memory consumption. Thus, the scrollability feature should be used only for small result sets.

let! pat = expr in cexpr let pat = expr in cexpr use pat = expr in cexpr use! pat = expr in cexpr do! expr in cexpr do expr in cexpr for pat in expr do cexpr while expr do cexpr if expr then cexpr1 else cexpr2 if expr then cexpr cexpr1 cexpr2 return expr return! expr

Besides the performance implications of using a client-side cache, certain types of result sets are not feasible for certain kinds of queries. If you specify an infeasible result set type or concurrency type for the query you execute, the JDBC driver follows a set of downgrade rules to select the next best ResultSet type. In this section, we ll look at the various limitations of ResultSet.