我需要使用PHP代碼從ID中檢索特定數據。但我得到空值運行代碼時

Question

這裏是我的PHP代碼

$response = array(); 

include_once('../connections/connection.php'); 

$id = $_GET['id']; 

$result = mysql_query("SELECT * FROM vacancy_list WHERE 'id' = '$id'") or die(mysql_error()); 

//For each row, add the field to the corresponding column 
    $result = mysql_fetch_assoc($result); 

     $vacancy = array(); 
    $vacancy["id"] = $result["id"]; 
    $vacancy["title"] = $result["title"]; 
    $vacancy["date"] = $result["date"]; 
    $vacancy["country"] = $result["country"]; 
     $vacancy["description"] = $result["description"]; 
     // $vacancy["status"] = $row["status"]; 


    $response["success"] = 1; 

    $response["vacancy"] = array(); 
     array_push($response["vacancy"], $vacancy); 


// success 
    $response["success"] = 1; 

    // echoing JSON response 
    echo json_encode($response); 

    mysql_close($connection); 
    ?> 

結果：

{"success":1,"vacancy":[{"id":null,"title":null,"date":null,"country":null,"description":null}]} 

我每次傳遞的$ id = $ _GET [ '身份證']值;結果相同，它在所有字段中都顯示爲空。我試圖直接從它不工作的URL發送值..

我想要做的是從android單擊事件獲取ID。每次單擊列表視圖它去到另一個網頁，但顯示空值

這裏是我的Android代碼：在列表項

package com.acos.allcorniceoverseas; 

import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.List; 

import org.apache.http.NameValuePair; 
import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

import com.acos.allcorniceoverseas.lib.DatabaseSQLite; 
import com.acos.allcorniceoverseas.lib.JSONParser; 

import android.app.ListActivity; 
import android.app.ProgressDialog; 
import android.content.Intent; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.ListAdapter; 
import android.widget.ListView; 
import android.widget.SimpleAdapter; 
import android.widget.TextView; 
import android.widget.AdapterView.OnItemClickListener; 

    public class Vacancy extends ListActivity{ 

     DatabaseSQLite dataController = new DatabaseSQLite(this); 

     private ProgressDialog pDialog; 

      // Creating JSON Parser object 
      JSONParser jParser = new JSONParser(); 

      ArrayList<HashMap<String, String>> vacancyList; 

      // url to get all products list 
      private static String url_all_products = "http://hariyalihost.com/sql_to_pdf/vacancy.php"; 

      // JSON Node names 
      private static final String TAG_SUCCESS = "success"; 
      private static final String TAG_VACANCY = "vacancys"; 
      private static final String TAG_ID = "id"; 
      private static final String TAG_TITLE = "title"; 
      private static final String TAG_COUNTRY = "country"; 
      private static final String TAG_DESC = "description"; 
     // private static final String TAG_UPDATESTATUS = "status"; 
      private static final String TAG_DATE ="date"; 

      // products JSONArray 
      JSONArray products = null; 

      //MainActivity ma = new MainActivity(); 

     @Override 
     protected void onCreate(Bundle savedInstanceState) { 
      // TODO Auto-generated method stub 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.vacancy); 

      // Hashmap for ListView 
      vacancyList = new ArrayList<HashMap<String, String>>(); 
      //ma.checkInternetConnection(); 

      // Loading products in Background Thread 
      new LoadAllProducts().execute(); 

      // Get listview 
      ListView lv = getListView(); 

      // on seleting single product 
      // launching Edit Product Screen 
      lv.setOnItemClickListener(new OnItemClickListener() { 

       @Override 
       public void onItemClick(AdapterView<?> parent, View view, 
         int position, long id) { 
        // getting values from selected ListItem 
        String vid = ((TextView) view.findViewById(R.id.pid)).getText() 
          .toString(); 

        // Starting new intent 
        Intent in = new Intent(getApplicationContext(), 
          Vacancy_Detail.class); 
        // sending pid to next activity 
        in.putExtra(TAG_ID, vid); 

        // starting new activity and expecting some response back 
        startActivityForResult(in, 100); 
       } 
      }); 
      /*lv.setOnScrollListener(new OnScrollListener(){ 
       public void onScrollStateChanged(AbsListView view, int scrollState) {} 

       public void onScroll(AbsListView view, int firstVisibleItem, 
       int visibleItemCount, int totalItemCount) { 

       int lastInScreen = firstVisibleItem + visibleItemCount; 
      });*/ 

     } 

     // Response from Edit Product Activity 
     @Override 
     protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
      super.onActivityResult(requestCode, resultCode, data); 
      // if result code 100 
      if (resultCode == 100) { 
       // if result code 100 is received 
       // means user edited/deleted product 
       // reload this screen again 
       Intent intent = getIntent(); 
       finish(); 
       startActivity(intent); 
      } 

     } 

     /** 
     * Background Async Task to Load all product by making HTTP Request 
     * */ 
     class LoadAllProducts extends AsyncTask<String, String, String> { 

      /** 
      * Before starting background thread Show Progress Dialog 
      * */ 
      @Override 
      protected void onPreExecute() { 
       super.onPreExecute(); 
       pDialog = new ProgressDialog(Vacancy.this); 
       pDialog.setMessage("Loading vacancy. Please wait..."); 
       pDialog.setIndeterminate(false); 
       pDialog.setCancelable(false); 
       pDialog.show(); 
      } 

      /** 
      * getting All products from url 
      * */ 
      protected String doInBackground(String... args) { 
       // Building Parameters 
       List<NameValuePair> params = new ArrayList<NameValuePair>(); 
       // getting JSON string from URL 
       JSONObject json = jParser.makeHttpRequest(url_all_products, "GET", params); 

       // Check your log cat for JSON reponse 
       Log.d("All Products: ", json.toString()); 

       try { 
        // Checking for SUCCESS TAG 
        int success = json.getInt(TAG_SUCCESS); 

        if (success == 1) { 
         // products found 
         // Getting Array of Products 
         products = json.getJSONArray(TAG_VACANCY); 

         // looping through All Products 
         for (int i = 0; i < products.length(); i++) { 
          JSONObject c = products.getJSONObject(i); 

          // Storing each json item in variable 
          String id = c.getString(TAG_ID); 
          String title = c.getString(TAG_TITLE); 
          String country = c.getString(TAG_COUNTRY); 
          String desc = c.getString(TAG_DESC); 
          // String uStatus = c.getString(TAG_UPDATESTATUS); 
          String udate = c.getString(TAG_DATE); 
          // creating new HashMap 
          HashMap<String, String> map = new HashMap<String, String>(); 

          // adding each child node to HashMap key => value 
          map.put(TAG_ID, id); 
          map.put(TAG_TITLE, title); 
          map.put(TAG_COUNTRY, country); 
          map.put(TAG_DESC, desc); 
          // map.put(TAG_UPDATESTATUS, uStatus); 
          map.put(TAG_DATE, udate); 
          // adding HashList to ArrayList 
          vacancyList.add(map); 

          // dataController.updateSyncStatus(c.get("id").toString(), c.getString("status").toString()); 
          // DatabaseSQLite ds = new DatabaseSQLite(getApplicationContext()); 
          // ds.getAllVacancy(); 
         } 
        } else { 
         // no products found 
         // Launch Add New product Activity 
         Intent i = new Intent(getApplicationContext(), 
           Vacancy.class); 
         // Closing all previous activities 
         i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 
         startActivity(i); 
        } 
       } catch (JSONException e) { 
        e.printStackTrace(); 
       } 


       return null; 
      } 

      /** 
      * After completing background task Dismiss the progress dialog 
      * **/ 
      protected void onPostExecute(String file_url) { 
       // dismiss the dialog after getting all products 
       pDialog.dismiss(); 
       // updating UI from Background Thread 
       runOnUiThread(new Runnable() { 
        public void run() { 
         /** 
         * Updating parsed JSON data into ListView 
         * */ 
         ListAdapter adapter = new SimpleAdapter(
          Vacancy.this, vacancyList, 
          R.layout.list_row, new String[]{ TAG_ID, TAG_TITLE, TAG_COUNTRY, TAG_DESC, TAG_DATE }, 
          new int[]{R.id.pid, R.id.title, R.id.country, R.id.desc, R.id.vdate}); 

         setListAdapter(adapter); 

         } 
       }); 

      } 

     } 
    } 

此代碼顯示值，每當我點擊進入名單的另一個「vacancy_detail 「
頁 這裏是vacancy_detail的代碼：

package com.acos.allcorniceoverseas; 

import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.List; 

import org.apache.http.NameValuePair; 
import org.apache.http.message.BasicNameValuePair; 
import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

import android.app.Activity; 
import android.app.ProgressDialog; 
import android.content.Intent; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.util.Log; 
import android.widget.TextView; 

import com.acos.allcorniceoverseas.lib.JSONParser; 

public class Vacancy_Detail extends Activity{ 

    TextView tv1, tv2, tv3, tv4; 

    String vid; 

    // Progress Dialog 
    private ProgressDialog pDialog; 

    // Creating JSON Parser object 
    JSONParser jParser = new JSONParser(); 

    ArrayList<HashMap<String, String>> vacancyList; 

    // url to get all products list 
    private static String url_vacancy_detail = "http://hariyalihost.com/sql_to_pdf/vacancy_detail.php"; 

    // JSON Node names 
    private static final String TAG_SUCCESS = "success"; 
    private static final String TAG_VACANCY = "vacancy"; 
    private static final String TAG_PID = "id"; 
    private static final String TAG_TITLE = "title"; 
    private static final String TAG_COUNTRY = "country"; 
    private static final String TAG_DESC = "description"; 
    private static final String TAG_DATE ="date"; 

    // products JSONArray 
    JSONArray vacancy = null; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     // TODO Auto-generated method stub 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.vacancy_detail); 

     // getting product details from intent 
      Intent i = getIntent(); 

      // getting product id (id) from intent 
      vid = i.getStringExtra(TAG_PID); 

      new GetVacancyDetails().execute(); 
    } 

    /** 
    * Background Async Task to Get complete vacancy details 
    * */ 
    class GetVacancyDetails extends AsyncTask<String, String, String> { 

     /** 
     * Before starting background thread Show Progress Dialog 
     * */ 
     @Override 
     protected void onPreExecute() { 
      super.onPreExecute(); 
      pDialog = new ProgressDialog(Vacancy_Detail.this); 
      pDialog.setMessage("Loading vacancy details. Please wait..."); 
      pDialog.setIndeterminate(false); 
      pDialog.setCancelable(true); 
      pDialog.show(); 

     } 

     /** 
     * Getting product details in background thread 
     * */ 
     protected String doInBackground(String... params) { 

      // updating UI from Background Thread 
      runOnUiThread(new Runnable() { 
       public void run() { 
        // Check for success tag 
        int success; 
        try { 
         // Building Parameters 
         List<NameValuePair> params = new ArrayList<NameValuePair>(); 
         params.add(new BasicNameValuePair("id", vid)); 

         // getting product details by making HTTP request 
         // Note that product details url will use GET request 
         JSONObject json = jParser.makeHttpRequest(
           url_vacancy_detail, "GET", params); 

         // check your log for json response 
         Log.d("Single Product Details", json.toString()); 

         // json success tag 
         success = json.getInt(TAG_SUCCESS); 
         if (success == 1) { 
          // successfully received product details 
          JSONArray productObj = json 
            .getJSONArray(TAG_VACANCY); // JSON Array 

          // get first product object from JSON Array 
          JSONObject product = productObj.getJSONObject(0); 

          // vacancy with this pid found 

          tv1 = (TextView) findViewById(R.id.tvTitle); 
          tv2 = (TextView) findViewById(R.id.tvDate); 
          tv3 = (TextView) findViewById(R.id.tvCountry); 
          tv4 = (TextView) findViewById(R.id.tvDesc); 

          // display product data in EditText 
          tv1.setText(product.getString(TAG_TITLE)); 
          tv2.setText(product.getString(TAG_DATE)); 
          tv3.setText(product.getString(TAG_COUNTRY)); 
          tv4.setText(product.getString(TAG_DESC)); 

         }else{ 
          // product with pid not found 
          tv1.setText("No details found"); 
         } 
        } catch (JSONException e) { 
         e.printStackTrace(); 
        } 
       } 
      }); 

      return null; 
     } 

     /** 
     * After completing background task Dismiss the progress dialog 
     * **/ 
     protected void onPostExecute(String file_url) { 
      // dismiss the dialog once got all details 
      pDialog.dismiss(); 
     } 
    } 
} 

Answer 1

第一echo your sql和see.I認爲你是無法接收$_GET['id']。看看你是否使用post or get方法。

和改變這種$result = mysql_fetch_assoc($result);到

$res = mysql_fetch_assoc($result);

$vacancy = array(); 
    $vacancy["id"] = $res["id"]; 
    $vacancy["title"] = $res["title"]; 
    $vacancy["date"] = $res["date"]; 
    $vacancy["country"] = $res["country"]; 
     $vacancy["description"] = $res["description"];