@Override
 public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
   MatchDb.onUpgrade(db, oldVersion, newVersion);
   PerformanceDb.onUpgrade(db, oldVersion, newVersion);
 }
 @Override
 public void onCreate(SQLiteDatabase db) {
   MatchDb.onCreate(db);
   PerformanceDb.onCreate(db);
 }