在现有的sqlite数据库中插入json数据？

Question

我在资产文件夹中有sqlite文件，并将其复制到sqlite数据库中，在安装应用程序时，它会显示给用户。 现在我想从服务器json文件插入新数据。我从服务器获取了json数据并成功完成了解析部分，但它没有插入到现有数据库中。 用于解析json数据并在列表中显示的代码。代码中没有任何错误。但是我无法将其插入到现有的sqlite数据库中。

    public void get_data(String data)
        {

            try {
                JSONArray data_array=new JSONArray(data);

                for (int i = 0 ; i < data_array.length() ; i++)
                {
                    JSONObject obj=new JSONObject(data_array.get(i).toString());

                    Message add=new Message();


                    add.category = obj.getString("category");
                    add.status = obj.getString("status");
                    add.imagelink=obj.getString("imglink");
                    objlist.add(add);
                    db1.addSMS(add);
                }

                new ListAdapter(CatagoryActivity.this, objlist).notifyDataSetChanged();

            } catch (JSONException e) {
                e.printStackTrace();
            }

        }
        public ArrayList<Message> getMessages() {
            ArrayList<Message> objlist_msg = new ArrayList<Message>();
            Message obj;
            adp.open();
            Cursor c = adp.Catagorylist();
            c.moveToFirst();
            /*
             * Toast.makeText(CatagoryActivity.this, "" + c.getCount(),
             * Toast.LENGTH_LONG) .show();
             */

            for (int i = 0; i < c.getCount(); i++) {
                obj = new Message();

                String msg = c
                        .getString(c.getColumnIndex(MessagesAdapter.CATEGORY));
                String imagelink = c.getString(c
                        .getColumnIndex(MessagesAdapter.Imagelink));

                obj.setImagelink(imagelink);
                Cursor c1 = adp.getcount(msg);
                c1.moveToFirst();
                int count = c1.getCount();
                obj.setCategory(msg);
                obj.setCount(String.valueOf(count));
                objlist_msg.add(obj);

                c.moveToNext();
            }

            adp.close();
            return objlist_msg;
        }

        public class ListAdapter extends BaseAdapter {
            private Context context;
            private ArrayList<Message> objlist;

            public ListAdapter(Context context, ArrayList<Message> objlist) {
                this.context = context;
                this.objlist = objlist;
            }

            public View getView(int position, View convertView, ViewGroup parent) {

                ViewHolder holder=null;
                if(convertView==null){
                LayoutInflater inflater = (LayoutInflater) context
                        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                holder=new ViewHolder();
                convertView = inflater.inflate(R.layout.catagory_list_raw, null);
                holder.txt = (TextView) convertView.findViewById(R.id.text);
                holder.count = (TextView) convertView.findViewById(R.id.count);
                convertView.setTag(holder);
                }else{
                    holder=(ViewHolder)convertView.getTag();
                }
                holder.txt.setText(objlist.get(position).getCategory().toString());

                return convertView;
            }

            @Override
            public int getCount() {
                return objlist.size();
            }

            @Override
            public Object getItem(int position) {
                return objlist.get(position);
            }

            @Override
            public long getItemId(int position) {
                return position;
            }


        }

        class ViewHolder{
            TextView txt,count;
        }


     //This function in Database.java file



    public void addSMS(Message sms) {
            SQLiteDatabase db123 = this.getWritableDatabase();
            try{
                ContentValues values = new ContentValues();
                values.put(MessagesAdapter.CATEGORY, sms.getCategory());
                values.put(MessagesAdapter.Status, sms.getStatus());
                values.put(MessagesAdapter.Imagelink,sms.getImagelink());
                db123.insert(MessagesAdapter.TBL_CATEGORY, null, values);
                //Log.e("TAG","JSON DATA INSERTED");
                db123.close();
            }catch (Exception e){
                Log.e("problem",e+"");
            }
        }