char conversion [closed]

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I want to know what will be the best way for a char-char conversion.

I will create some data for the conversion for example teh letter "A" will be converted to "C" and so on.

Shall I use a MySQL DB or files or what?

Note: The application will be a web app and most likely be running ASP or PHP.

EDIT:

I want to create a website or a desktop app that will allow user who work on PCs that only support one language to be able to use any other language something like a translator, yet it is not a translator.

For example, arabic users cannot use the AR keyboard due to system restrictions, I want to help them write in the language without installing the language pack. I`m facing this problem myself, and can`t install language pack without admin access.

I can`t provide output at the moment as the PC I`m using doesn`t support AR.

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I guess you mean character / keyboard mapping (or an Input Method Editor as Ignacio Vazquez-Abrams said)...

In this case, create static hash maps / associative arrays that map keys to characters or strings.
That said, however, I think there are some keyboard mapping tools out there that hook into the operating system and can be customized to one's needs.

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What about JavaScript?

Here's a simple code for converting the infamous YZ keys to ZY (QWERTY <-> QWERTZ).

<textarea id="txt"></textarea>

<script language="JavaScript" type="text/JavaScript">
  document.getElementById("txt").onkeydown = InputKeyDown;
  function InputKeyDown(event) {
    var shift = event.shiftKey;
    var keyCode = (event.which == null) ? event.keyCode : event.which;

    //alert(String.fromCharCode(keyCode) + "\\n" + keyCode); return false;

    switch (keyCode) {
      case 89 /* Y */: InsertAtCursor(event.target, shift ? 'Z' : 'z'); return false;
      case 90 /* Z */: InsertAtCursor(event.target, shift ? 'Y' : 'y'); return false;
      default: return true;
    }
  }
</script>

I think you could start something with this. You can also use the event.ctrlKey or event.altKey flags for more complex languages.