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The best way to see the handler work is to watch it in action Therefore, let s examine a real storage engine in use before we start building one You can follow along by compiling your server with debug if you haven t already Go ahead and start your server and debugger, and then attach your debugging tool to the running server as described in 5 I want to show you a simple storage engine in action In this case, I ll use the archive storage engine With the debugger open and the server running, open the ha_archivecc file and place a breakpoint on the first executable line for the following methods: int ha_archive::create(..) static ARCHIVE_SHARE *ha_archive::get_share(..) int ha_archive::write_row(..)int ha_tina::rnd_next(..) int ha_archive::rnd_next(...

This data structure would be suitable for representing arithmetic expressions of the forms var, expr + expr, and bind var = expr in expr. s 9 and 11 are dedicated to techniques for representing and processing languages of this kind. As with all tree structures, most traversal algorithms over this type of abstract syntax trees aren t naturally tail recursive. For example, here is a simple evaluator: type env = Map<string,int> let rec eval (env: env) expr match expr with | Add (e1,e2) -> | Bind (var,rhs,body) -> | Var var -> | Num n -> = eval env e1 + eval env e2 eval (env.Add(var, eval env rhs)) body env.[var] n

You start your control by inheriting from the UserControl class: 2 open open open open System System.Drawing System.Windows.Forms System.ComponentModel

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) Once the breakpoints are set, launch the command-line MySQL client, change to the test database, and issue this command: CREATE TABLE testarc (a int, b varchar(20), c int) ENGINE=ARCHIVE; You should immediately see the debugger halt in the create() method This method is where the base data table is created Indeed, it is one of the first things to execute The my_create() method is called to create the file Notice in this method that the field iterator loops through all of the fields in the table This is important because it shows that the fields are already created They are stored in the testarcfrm file in the data folder Notice that the code is looking for a field with the AUTO_INCREMENT_FLAG set (at the top of the method); if the field is found, the code sets an error and exits.

The recursive call eval env rhs isn t tail recursive. For the vast majority of applications, you never need to worry about making this algorithm tail recursive. However, stack overflow may be a problem if bindings are nested to great depth, such as in bind v1 = (bind v2 = . . . (bind v1000000 = 1. . .)) in v1+v1. If the syntax trees come from human-written programs, you can safely assume this won t be the case. But if you need to make the implementation tail recursive, you can use continuations, as shown in Listing 8-12. Listing 8-12. A Tail-Recursive Expression Evaluator Using Continuations let rec evalCont (env: env) expr cont = match expr with | Add (e1,e2) -> evalCont env e1 (fun v1 -> evalCont env e2 (fun v2 -> cont (v1+v2))) | Bind (var,rhs,body) -> evalCont env rhs (fun v1 -> evalCont (env.Add(var,v1)) body cont) | Num n -> cont n | Var var -> cont (env.[var]) let eval env expr = evalCont env expr (fun x -> x)

type OwnerDrawButton() = inherit UserControl() You then define the state of the control in terms of the fields of the class: let mutable text = "" let mutable pressed = false let fireClick,clickEvent = IEventcreate() The text field will contain the label of the button As you did for the movingPoint variable in the Curves example, the pressed field is responsible for remembering whether the button is currently pressed, allowing the paint handler to behave appropriately The fireClick and clickEvent fields remember the listeners registered to be notified of the click event of the button by using the F# events described in 8 You override the OnPaint method to handle the paint event You allocate the pens and the brush required to draw and invert the role of the border colors in order to achieve the raised effect when the button is not pressed and the depressed look otherwise.

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