Question

I am trying to upgrade a certain table by adding a column to a Sqlite table in my android app.I have added an alter table statement in the onUpgrade method of my DBHelper.

Here are the problems that I am seeing
I changed the value of Database version from 1 to 2, so ideally now the onUpgrade should get called.It does get called, but it gets called everytime I instantiate the class.As a result I get a column already exists error.

Here is the onUpgrade method

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, 
    int newVersion) 
    {
        Log.d("old Version",oldVersion+"");
        Log.d("New Version",newVersion+"");
        db.beginTransaction();

        try
        {           
            String DATABASE_UPGRADE;
            DATABASE_UPGRADE="alter table "+DATABASE_TABLE_MESSAGES+" ADD COLUMN  "+ IS_READ+ " integer DEFAULT 0;";
            db.execSQL(DATABASE_UPGRADE);
            Log.d("upgrade", "Successful");
            db.setTransactionSuccessful();
        } 


    finally 
    {
        db.endTransaction();
    }

    }
}    

I am wondering why the onUpgrade gets called each time!!!

Answer 1

In the constructor of your database helper are you correctly passing the new version number?

EDIT: should look like this

DatabaseHelper(Context context)
        {
            super(context, DATABASE_NAME, null, DATABASE_VERSION);
        }

and DATABASE_VERSION should be 2.