java - android:如何在哈希表中加载sqlite数据

Question

我是 java 和 android 新手。我想在哈希表中获取 sqlite 行，然后将它们像数据集一样发送到服务器。我以前从未使用过哈希表，因为哈希表需要两个参数键和值，我不知道如何传递键，有人可以告诉我实现此目的的正确方法是什么。

  public Hashtable<String,ChemOrderDetailTable> getDetail(){

       db = DBHelper.getWritableDatabase();
       Cursor c= db.query(DB_TABLE_CHEMIST_ORDERS_DETAIL, null, null, null, null, null, null, null);
       Hashtable<String,ChemOrderDetailTable> hashtable = 
             new Hashtable<String,ChemOrderDetailTable>();
       if (c != null) {
             while (c.moveToNext()) {

                 String orderNo = c.getString(c.getColumnIndex(CHEM_ORDERS_DETAIL_ORDERNO));
                 String prodCode = c.getString(c.getColumnIndex(CHEM_ORDERS_DETAIL_PRODCODE));
                 String qty= c.getString(c.getColumnIndex(CHEM_ORDERS_DETAIL_QTY));
                 String tp= c.getString(c.getColumnIndex(CHEM_ORDERS_DETAIL_TYP));
                 String total = c.getString(c.getColumnIndex(CHEM_ORDERS_DETAIL_AMOUNT));

                 ChemOrderDetailTable chemDetailTable = new ChemOrderDetailTable();
                 chemDetailTable.setOrderNo(orderNo);
                 chemDetailTable.setProdCode(prodCode);
                 chemDetailTable.setQTY(qty);
                 chemDetailTable.setOrderNo(tp);
                 chemDetailTable.setTotal(total);

                 hashtable.put(key, chemDetailTable);

             }
          } 
     return hashtable; 

 }

Answer 1

将哈希表发送到服务器

JSONObject json = new JSONObject();
json.putAll(hashtable);

将 json.toString() 作为 API 中的负载发送