复制BST，不包括唯一值

Question

   

  public DBHelper(Context context) {
    super(context, DATABASE_NAME, null, DATABASE_VERSION);
    this.mContext = context;
    Log.e("Path 1", DB_PATH);
  }
  public void openDataBase() throws SQLException {
    String myPath = DB_PATH + DATABASE_NAME;
    myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READWRITE);

  }
  @Override
  public void onCreate(SQLiteDatabase database) {
    String createQuery1 = "CREATE TABLE " + COURSES_TABLE + "(" +
      COURSES_KEY_FIELD_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
      FIELD_ALPHA + " TEXT, " +
      FIELD_NUMBER + " TEXT, " +
      FIELD_TITLE + " TEXT," +
      FIELD_TITLE1 + " TEXT," +
      FIELD_TITLE2 + " TEXT " + ")";


    database.execSQL(createQuery1);



    String createQuery2 = "CREATE TABLE " + OFFERINGS_TABLE + "(" +
      OFFERINGS_KEY_FIELD_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
      FIELD_SEMESTER_CODE + " INTEGER, " +
      FIELD_COURSE_ID + " INTEGER, "

      +
      "FOREIGN KEY(" + FIELD_COURSE_ID + ") REFERENCES "

      +
      COURSES_TABLE + "(" + COURSES_KEY_FIELD_ID + ")" +
      ")";
    database.execSQL(createQuery2);



    String createQuery3 = "CREATE TABLE " + DATAALL_TABLE + "(" +
      COURSES_KEY_FIELD_ID1 + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
      FIELD_BARCODE + " TEXT, " +
      FIELD_MATERIALNUM + " TEXT, " +
      FIELD_MATERIALDESC + " TEXT, " +
      FIELD_CURRENTDATE + " TEXT, " +
      FIELD_PRODUCTIONDATE + " TEXT, " +
      FIELD_EXPIRYRATIO + " TEXT, " +
      FIELD_PRODUCTIONEXPIRY + " TEXT, " +
      FIELD_QTY + " TEXT " + ")";


    database.execSQL(createQuery3);
  }
  @Override
  public void onUpgrade(SQLiteDatabase database,
    int oldVersion,
    int newVersion) {
    database.execSQL("DROP TABLE IF EXISTS " + COURSES_TABLE);

    database.execSQL("DROP TABLE IF EXISTS " + OFFERINGS_TABLE);
    database.execSQL("DROP TABLE IF EXISTS " + DATAALL_TABLE);
    onCreate(database);
  }
  private boolean checkDataBase() {
    SQLiteDatabase checkDB = null;
    try {
      String myPath = DB_PATH + DATABASE_NAME;
      checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
    } catch (SQLiteException e) {}
    if (checkDB != null) {
      checkDB.close();
    }
    return checkDB != null ? true : false;
  }
  private void copyDataBase() throws IOException {
    InputStream myInput = mContext.getAssets().open(DATABASE_NAME);
    String outFileName = DB_PATH + DATABASE_NAME;
    OutputStream myOutput = new FileOutputStream(outFileName);
    byte[] buffer = new byte[10];
    int length;
    while ((length = myInput.read(buffer)) > 0) {
      myOutput.write(buffer, 0, length);
    }
    myOutput.flush();
    myOutput.close();
    myInput.close();

  }
  //******* ADDING THE DATA IN TO DATABASE
  public void insertlabel(String Material_Barcode, String Material_Number, String Material_Description, String Scanning_Date, String Production_Date, String Expiry_Ratio, String Product_Durability, String Qty) {
    SQLiteDatabase db = this.getWritableDatabase();
    ContentValues cv = new ContentValues();
    cv.put(FIELD_BARCODE, Material_Barcode);
    cv.put(FIELD_MATERIALNUM, Material_Number);
    cv.put(FIELD_MATERIALDESC, Material_Description);
    cv.put(FIELD_CURRENTDATE, Scanning_Date);
    cv.put(FIELD_PRODUCTIONDATE, Production_Date);
    cv.put(FIELD_EXPIRYRATIO, Expiry_Ratio);
    cv.put(FIELD_PRODUCTIONEXPIRY, Product_Durability);
    cv.put(FIELD_QTY, Qty);
    db.insert(DATAALL_TABLE, null, cv);
    db.close();
  }
  //********** COURSE TABLE OPERATIONS:  ADD, GETALL, EDIT, DELETE

当包含值15的节点是叶节点（没有childern）时，此函数有效，但是，如果此节点是父节点，则它不起作用。有人可以帮我调整指针，这样即使节点是父节点，它也会创建一个没有15的新树吗？