How to access a stored HTML5 database from the Objective C part of my app

I'll try to be as clear and direct as possible in the following description: I have to develop an 开发者_开发问答iPad-App that consists of four parts. Three of them have to be written with Objective C, but for the fourth, I considered using a UIWebView in combination with a HTML5 database, if possible.

The question I have is: Is it possible to access a HTML5 database stored locally and used in a UIWebView from outside the UIWebView, i.e. with code written in Objective-C?

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I didn't try it, but something like this should work :

NSString *myDB = [myWebView stringByEvaluatingJavaScriptFromString:@"
    var database = openDatabase(\"My DB\", \"DB Version\");
    database.executeSql(\"SELECT * FROM table\", function(result) {
        document.write(result);
    });
"];