public void upgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
		for (TableHelper th : getTableHelpers()) {
			th.onUpgrade(db, oldVersion, newVersion);
		}
	}
public void upgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
		for (TableHelper th : getTableHelpers()) {
			th.onUpgrade(db, oldVersion, newVersion);
		}
	}
public void upgrade ( SQLiteDatabase db , int oldVersion , int newVersion ) { for ( TableHelper th : getTableHelpers ( ) ) { th . onUpgrade ( db , oldVersion , newVersion ) ; } }
Calls {@link TableHelper#onUpgrade(SQLiteDatabase, int, int)} for
each TableHelper. Override this method to implement your own
upgrade strategy.

@param db
@param oldVersion
@param newVersion
Calls { @link TableHelper#onUpgrade ( SQLiteDatabase int int ) } for each TableHelper . Override this method to implement your own upgrade strategy .