Checkbox in a custom adapter to update the database

I am trying to get the checkbox I created in a custom adapter for a list to update the database upon clicking on it. I implemented the onclicklistener on the checkbox inside the customAdapter (code below). I also added a Toast to check if it works. The problem is that the Toast displays the right information for each row (the name of the item i click on); however the database doesn't get updated.

 datasource = new MySQLiteHelper((AssTasksActivity) context);

    CB.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Task Ta = task; //Task is an object with a separate class that is stored in the sqlite db.

            if(CB.isChecked()){
                Ta.setState(0);
                datasource.updateTask(Ta);
                //Toast T;
                Toast.makeText(context, Ta.getTaskName(),
                        Toast.LENGTH_LONG).show();
            }
            else{

                Ta.setState(1);
                datasource.updateTask(Ta);
                Toast.makeText(context, Ta.getTaskName(),
                        Toast.LENGTH_LONG).show();
            }
        }
    });