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This allows me to once again separate the database access from the forms The class methods having to do with issuing queries and retrieving results are a design from a choice of implementations I chose to implement an access iterator that permits the client to issue the query and then iterate through the results I also needed a method that tells the database that a book has been vended so that the database can reduce the quantity on hand value for that book Data retrieval is accomplished using three methods that return a character string, an integer, or a large text field I also added helper methods for getting a setting from the settings table, getting a field from the database (for the administrator interface), and a quick method to retrieve the quantity on hand Listing 6-12 shows the complete source code for the database class header.

References a DLL. The DLL is loaded dynamically when first required. Adds the given search path to that used to resolve referenced DLLs. Loads the given file(s) as if it had been compiled by the F# command-line compiler. Toggles timing information on/off. Exits F# Interactive.

Note The rationale for this is that using large, volatile discriminated unions freely in APIs will encourage

I named the class DBEngine Table 6-4 includes a description and use for each method in the class Listing 6-12 Database Engine Class Header (DBEngineh) #pragma once #pragma unmanaged #include <stdioh> class DBEngine { private: bool mysqlError; public: DBEngine(void); const char *GetError(); int Error();.

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Although F# Interactive is reminiscent of the read-eval-print loops of interpreted languages, it s substantially different because it compiles code rather than interprets it. Whenever a code fragment is typed at the top level, it s compiled on the fly as part of a dynamic assembly and evaluated for side effects. This is particularly important for types because you can create new ones at the top level and their dependencies may be tricky to understand fully. Let s start with an example of a nontrivial use of F# Interactive that shows these intricacies. You define the class APoint, which represents points using an angle and a radius: type APoint(angle,radius) = member x.Angle = angle member x.Radius = radius new() = APoint(angle=0.0, radius=0.0)

people to use pattern matching against these discriminated union values. This is appropriate for unions that do not change. However, if you reveal discriminated unions indiscriminately, you may find it very hard to version your library without breaking user code.

void Initialize(); void Shutdown(); char *GetSetting(char *Field); char *GetBookFieldStr(int Slot, char *Field); char *GetBookFieldText(int Slot, char *Field); int GetBookFieldInt(int Slot, char *Field); int GetQty(int Slot); void VendBook(char *ISBN); void StartQuery(char *QueryStatement); void RunQuery(char *QueryStatement); int GetNext(); char *GetField(int fldNum); ~DBEngine(void); }; #pragma managed Table 6-4. Database Engine Class Methods

One important tool in F# programming is pattern matching, a general construct that combines decomposition and control. In the previous sections, you got a taste of how you can use pattern matching with tuple, list, and option values. However, you can also use pattern matching in many other situations. You see many other examples of pattern matching in this book, but let s start with some simple pattern matching over strings and integers. As you ve already seen, pattern matches on explicit values are introduced using the match ... with ... construct: let urlFilter url agent = match (url,agent) with | "http://www.control.org", 99 -> true | "http://www.kaos.org" , _ -> false | _, 86 -> true | _ -> false The inferred type of the function is as follows: val urlFilter : string -> int -> bool The expression (url,agent) after the keyword match is a tuple of type (string*int). Each rule of the match is introduced with a | followed by a pattern, then ->, and then a result expression. When executed, the patterns of the rules are used one by one, and the first successful pattern match determines which result expression is used. In the previous example, the first pattern matches if url and agent are "http://www.control.org" and 99, respectively. The next matches if url is "http://www.kaos.org". The third pattern matches if agent is 86. The last three rules all use wildcard patterns represented by the underscore character; these match all inputs.

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