Force the installation script


I just typed this places fast, it should help you get going in the right direction. You will need to tweak it accordingly for your project if

//Define our variables
private var dbVSO:SharedObject = SharedObject.getLocal("DBVersion"); //Persist the database version
private var installedDBVersion:Number = dbVSO.data.dbV; //Pull the database version from localstorage
private var currentDBVersion:Number = 2; //Used to check in the event of an app upgrade
private var dbFile:File = File.applicationStorageDirectory.resolvePath("sweetDB.db");

//Check if we need to create dbFile:
if(!dbFile.exists) {
    createDB();
} else {
    checkUpdates();
}

//Put this in checkUpdates function.
//Check if the database is already created, but localstorage hasn't been setup...
if(installedDBVersion == undefined) {
    dbVSO.data.dbV = 2; //Current install considered version 1
    dbVSO.flush(); //Saves the information to localstorage
    installedDBVersion = dbVSO.data.dbV; //Updates our variable to reflect the correct status

    //Run the update function
    version2Update();
    return; //We don't want to go any further.
}

//Check if the database version currently running is
if(installedDBVersion < currentDBVersion) {
    //We need to do a database update.
}

/*
    You're probably making the additions to your database now. Meaning fresh installs will get the
    latest version of the database, so you won't need to run the update on them. Only existing users.
*/

//In your createDB function you'll want to handle setting the localstorage up:
private function createDB():void {
    dbVSO.data.dbV = 2; //Current installs out there would be version 1?
    dbVSO.flush(); //Saves the information to localstorage
    installedDBVersion = dbVSO.data.dbV; //Updates our variable to reflect the correct status

    //Rest of your SQL database creation stuff....
    // ...
}

Here's a pastebin if it makes it easier to read: http://pastebin.com/f2siDhfD

Tags: BlackBerry Developers

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