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If you find that the native SQL commands do not meet your needs and you cannot solve your problems with user-defined functions, you may have to add a new SQL command to the server. This section shows you how to add your own SQL commands to the server. Adding new SQL commands is considered by many to be the most difficult extension of all to the MySQL server source code. As you will see, the process isn t as complicated as it is tedious. To add new SQL commands, you must modify the parser (in sql\sql_yacc.yy) and add the commands to the SQL command processing code (in sql\sql_parse.cc). When a client issues a query, a new thread is created and the SQL statement is forwarded to the parser for syntactic validation (or rejection due to errors). The MySQL parser is implemented using a large Lex-YACC script that is compiled with Bison. The parser constructs a query structure used to represent the query statement (SQL) in memory as a data structure that can be used to execute the query. Thus, to add a new command to the parser, you will need a copy of GNU Bison. You can download Bison from the GNU web site2 and install it.

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Let s look at this signature first, because it represents the design of the type. The worker constructor is given a function of type 'State -> 'State to compute successive iterations of the computation, plus an initial state and the number of iterations to compute. For example, you can compute the Fibonacci numbers using the following iteration function: let fibOneStep (fibPrevPrev:bigint,fibPrev) = (fibPrev, fibPrevPrev+fibPrev);; The type of this function is as follows: val fibOneStep : bigint * bigint -> bigint * bigint The RunWorkerAsync and CancelAsync members follow the BackgroundWorker design pattern, as do the events, except that you expand the RunWorkerCompleted event into three events to correspond to the three termination conditions and modify the ProgressChanged to include the state. You can instantiate the type as follows: > let worker = new IterativeBackgroundWorker<_>( fibOneStep,(1I,1I),100);; val worker : IterativeBackgroundWorker<bigint * bigint> > worker.WorkerCompleted.Add(fun result -> MessageBox.Show(sprintf "Result = %A" result) |> ignore);; val it : unit = () > worker.ProgressChanged.Add(fun (percentage, state) -> printfn "%d%% complete, state = %A" percentage state);; val it : unit = () > worker.RunWorkerAsync();; 1% complete, state = (1I, 1I) 2% complete, state = (1I, 2I) 3% complete, state = (2I, 3I) 4% complete, state = (3I, 5I) ... 98% complete, state = (135301852344706746049I, 218922995834555169026I) 99% complete, state = (218922995834555169026I, 354224848179261915075I) 100% complete, state = (354224848179261915075I, 573147844013817084101I) val it : unit = () One difference here is that cancellation and percentage progress reporting are handled automatically based on the iterations of the computation. This is assuming each iteration takes roughly the same amount of time. Other variations on the BackgroundWorker design pattern are possible. For example, reporting percentage completion of fixed tasks such as installation is often performed by timing sample executions of the tasks and adjusting the percentage reports appropriately.

Lex stands for lexical analyzer generator and is used as a parser to identify tokens and literals as well as syntax of a language. YACC stands for yet another compiler compiler and is used to identify and act on the semantic definitions of the language. The use of these tools together with Bison (a YACC-compatible parser generator that generates C source code from the Lex/YACC code) provides a rich mechanism of creating subsystems that can parse and process language commands. Indeed, that is exactly how MySQL uses these technologies.

Note You implement IterativeBackgroundWorker via delegation rather than inheritance. This is because its

The presentation layer, often authored using visual editing tools. These files include ASP.NET control declarations and embedded HTML tags. They may also include fragments of other languages such as CSS and scripts written in F#. Similar to the .aspx file but is used for writing elementary building blocks that can be reused on multiple pages in the application. The programmatic portion of the website logic. Typically makes extensive use of the System.Data and System.Web namespaces. Compiled DLLs referenced by your server-side code. Configuration files that may be located in every application directory and are used to specify aspects such as security or compilation options.

2. Linux/Unix users can download it from the GNU web site (www.gnu.org/software/bison). Windows users can download a Win32 version from http://gnuwin32.sourceforge.net/packages/bison.htm.

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