在android中使用php web services插入和更新mysql数据库

Question

我有php webservices和android客户端应用程序..我想使用webservice将数据插入mysql数据库但我的问题是，当我试图从Android应用程序中的查询读取结果时我得到了这个错误

  04-19 16:00:16.330: W/System.err(27629): org.json.JSONException: End of input at character 2 of  
   04-19 16:00:16.330: W/System.err(27629):     at org.json.JSONTokener.syntaxError(JSONTokener.java:450)
04-19 16:00:16.330: W/System.err(27629):    at org.json.JSONTokener.nextValue(JSONTokener.java:97)
04-19 16:00:16.330: W/System.err(27629):    at org.json.JSONArray.<init>(JSONArray.java:87)
04-19 16:00:16.330: W/System.err(27629):    at org.json.JSONArray.<init>(JSONArray.java:103)
 04-19 16:00:16.340: W/System.err(27629):   at com.vtab.GetNetworkData.onPostExecute(GetNetworkData.java:95)
 04-19 16:00:16.340: W/System.err(27629):   at com.vtab.GetNetworkData.onPostExecute(GetNetworkData.java:1)
04-19 16:00:16.340: W/System.err(27629):    at android.os.AsyncTask.finish(AsyncTask.java:602)
04-19 16:00:16.340: W/System.err(27629):    at android.os.AsyncTask.access$600(AsyncTask.java:156)
04-19 16:00:16.340: W/System.err(27629):    at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:615)
 04-19 16:00:16.340: W/System.err(27629):   at android.os.Handler.dispatchMessage(Handler.java:99)
04-19 16:00:16.340: W/System.err(27629):    at android.os.Looper.loop(Looper.java:137)
04-19 16:00:16.340: W/System.err(27629):    at android.app.ActivityThread.main(ActivityThread.java:4424)
04-19 16:00:16.340: W/System.err(27629):    at java.lang.reflect.Method.invokeNative(Native Method)
04-19 16:00:16.340: W/System.err(27629):    at java.lang.reflect.Method.invoke(Method.java:511)  
04-19 16:00:16.350: W/System.err(27629):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
04-19 16:00:16.350: W/System.err(27629):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
 04-19 16:00:16.350: W/System.err(27629):   at dalvik.system.NativeStart.main(Native Method)
 04-19 16:03:51.860: W/ThrottleService(167): unable to find stats for iface rmnet0

这是webservices函数

 <php
        function    insert_order_item($order_id,$item_id,$quantity,$cat_id,$rest_id,$order_item_total)
   {
       mysql_connect("localhost","root","root");
    mysql_select_db("myhoteldb");
    $sql=mysql_query("INSERT INTO order_item     (order_id,item_id,quantity,cat_id,rest_id,order_item_total_price)
                        VALUES($order_id,$item_id,$quantity,$cat_id,$rest_id,$order_item_total)");  

      mysql_close();
  }
    ?>

这是android代码

public class GetNetworkData extends AsyncTask{
    String uri;
    private OnPostExecuteListener  mPostExecuteListener = null;
    public static interface OnPostExecuteListener
    {
        void onPostExecute(String result);
    }

    GetNetworkData(
            String Url,
            OnPostExecuteListener postExecuteListener) throws Exception {

        uri = Url;
        mPostExecuteListener = postExecuteListener;
        if (mPostExecuteListener == null)
            throw new Exception("Param cannot be null.");
    }

    @Override
    protected String  doInBackground(String... params) {
        // TODO Auto-generated method stub
        JSONObject param=null;
        String result = null;
        HttpClient httpClient = new DefaultHttpClient();
        HttpHost httpHost = new HttpHost("192.168.3.111",80);
        HttpPost httpPost = new HttpPost(uri);
        httpPost.addHeader("Content-Type", "application/json; charset=utf-8");

        try
        {
            //HttpEntity bodyEntity = new StringEntity(param.toString(), "utf8");
            //httpPost.setEntity(bodyEntity);
            HttpResponse response = httpClient.execute(httpPost);
            HttpEntity entity = response.getEntity();

            if (entity != null) {
                InputStream instream = entity.getContent();
                BufferedReader reader = new BufferedReader(
                     new InputStreamReader(instream));
                StringBuilder sb = new StringBuilder();
                String line = null;
                while ((line = reader.readLine()) != null)
                    sb.append(line + "\n");

                result = sb.toString();
                instream.close();
            }
        }
        catch (Exception e) {
            // TODO: handle exception
        }
        return result;
    }

    @Override
    protected void onPostExecute(String result) {
        // TODO Auto-generated method stub
        if (mPostExecuteListener != null)
        {
            try {
                JSONArray jArray = new JSONArray(result);
                mPostExecuteListener.onPostExecute(result);
            } catch (JSONException e){
                e.printStackTrace();
            }
        }
    }
}