delete_product.php
<?php
/*
* Following code will delete a product from table
* A product is identified by product id (pid)
*/
// array for JSON response
$response = array();
// check for required fields
if (isset($_POST['id'])) {
$id = $_POST['id'];
// include db connect class
require_once __DIR__ . '/config.inc.php';
// connecting to db
$db = new DB_CONNECT();
// mysql update row with matched pid
$result = mysql_query("DELETE FROM foodordered WHERE id = $id");
// check if row deleted or not
if (mysql_affected_rows() > 0) {
// successfully updated
$response["success"] = 1;
$response["message"] = "Product successfully deleted";
// echoing JSON response
echo json_encode($response);
} else {
// no product found
$response["success"] = 0;
$response["message"] = "No product found";
// echo no users JSON
echo json_encode($response);
}
} else {
// required field is missing
$response["success"] = 0;
$response["message"] = "Required field(s) is missing";
// echoing JSON response
echo json_encode($response);
}
?>
Food.java
package com.yiqiexample.cc;
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.annotation.SuppressLint;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ListActivity;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
//import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
public class Food extends ListActivity
implements OnClickListener {
// Progress Dialog
private ProgressDialog pDialog;
private ListAdapter adapter;
//testing on Emulator:
private static final String READ_COMMENTS_URL = "http://10.0.2.2/pbda2/foodordered.php";
private static final String url_delete_product = "http://10.0.2.2/pbda2/delete_product.php";
// my ip add 192.168.43.176
//private CheckBox chkFood, chkDrinks, chkServices;
//private Button btnDisplay, chkClear, deliever, chkClearFood, fooddeliever, drinksdeliever, servicesdeliever, chkClearDrinks, chkClearServices;
//private TextView clearThis,orderdisplay, clearThisFood, foodorderdisplay, drinksorderdisplay, servicesorderdisplay, clearThisDrinks, clearThisServices;
private static final String TAG_SUCCESS = "success";
private static final String TAG_POSTS = "posts";
private static final String TAG_SEATNUMBER = "seatnumber";
private static final String TAG_FOODORDERED = "foodordered";
//it's important to note that the message is both in the parent branch of
//our JSON tree that displays a "Post Available" or a "No Post Available" message,
//and there is also a message for each individual post, listed under the "posts"
//category, that displays what the user typed as their message.
//An array of all of our comments
private JSONArray mComments = null;
//manages all of our comments in a list.
private ArrayList<HashMap<String, String>> mCommentList;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setContentView(R.layout.food);
View v = findViewById(R.id.backmain);
//set event listener
v.setOnClickListener(this);
View z = findViewById(R.id.drinksbtn);
//set event listener
z.setOnClickListener(this);
View x = findViewById(R.id.servicebtn);
//set event listener
x.setOnClickListener(this);
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
//loading the comments via AsyncTask
new LoadComments().execute();
}
/**
* Retrieves recent post data from the server.
*/
public void updateJSONdata() {
// Instantiate the arraylist to contain all the JSON data.
// we are going to use a bunch of key-value pairs, referring
// to the json element name, and the content, for example,
// message it the tag, and "I'm awesome" as the content..
mCommentList = new ArrayList<HashMap<String, String>>();
// Bro, it's time to power up the J parser
JSONParser jParser = new JSONParser();
// Feed the beast our comments url, and it spits us
//back a JSON object. Boo-yeah Jerome.
JSONObject json = jParser.getJSONFromUrl(READ_COMMENTS_URL);
//when parsing JSON stuff, we should probably
//try to catch any exceptions:
try {
//I know I said we would check if "Posts were Avail." (success==1)
//before we tried to read the individual posts, but I lied...
//mComments will tell us how many "posts" or comments are
//available
mComments = json.getJSONArray(TAG_POSTS);
// looping through all posts according to the json object returned
for (int i = 0; i < mComments.length(); i++) {
JSONObject c = mComments.getJSONObject(i);
//gets the content of each tag
String seatnumber = c.getString(TAG_SEATNUMBER);
String foodordered = c.getString(TAG_FOODORDERED);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
map.put(TAG_SEATNUMBER, seatnumber);
map.put(TAG_FOODORDERED, foodordered);
// adding HashList to ArrayList
mCommentList.add(map);
//annndddd, our JSON data is up to date same with our array list
}
} catch (JSONException e) {
e.printStackTrace();
}
}
@Override
public void onClick(View arg0) {
if(arg0.getId() == R.id.backmain){
//define a new Intent for the second Activity
Intent intent = new Intent(this,MainActivity.class);
//start the second Activity
this.startActivity(intent);
}
if(arg0.getId() == R.id.drinksbtn){
//define a new Intent for the second Activity
Intent intent = new Intent(this,Drinks.class);
//start the second Activity
this.startActivity(intent);
}
if(arg0.getId() == R.id.servicebtn){
//define a new Intent for the second Activity
Intent intent = new Intent(this,Services.class);
//start the second Activity
this.startActivity(intent);
}
}
/**
* Inserts the parsed data into the listview.
*/
private void updateList() {
// For a ListActivity we need to set the List Adapter, and in order to do
//that, we need to create a ListAdapter. This SimpleAdapter,
//will utilize our updated Hashmapped ArrayList,
//use our single_post xml template for each item in our list,
//and place the appropriate info from the list to the
//correct GUI id. Order is important here.
//ListAdapter
adapter = new SimpleAdapter(this, mCommentList,
R.layout.single_comment,
new String[] { TAG_SEATNUMBER, TAG_FOODORDERED
//TAG_DRINKSORDERED, TAG_SERVICES
}, new int[] { R.id.seatnumber, R.id.orders
//R.id.drinkstv, R.id.servicestv,
//adapter = new SimpleAdapter(this, mCommentList,
//R.layout.single_comment, new String[] { TAG_SEATNUMBER, TAG_FOODORDERED
//TAG_DRINKSORDERED, TAG_SERVICES
// }, new int[] { R.id.seatnumber, R.id.orders
//R.id.drinkstv, R.id.servicestv,
});
setListAdapter(adapter);
ListView lv = getListView();
lv.setOnItemClickListener(new OnItemClickListener() {
@SuppressLint("NewApi")
@Override
public void onItemClick(AdapterView<?> arg0, View arg1,
final int arg2, long arg3) {
// TODO Auto-generated method stub
AlertDialog.Builder alt = new AlertDialog.Builder(
Food.this,
android.R.style.Theme_DeviceDefault_Dialog);
alt.setMessage("Order delivered??");
alt.setPositiveButton("Yes",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
// TODO Auto-generated method stub
mCommentList.remove(arg2);
((BaseAdapter) adapter).notifyDataSetChanged();
//new
new DeleteProduct().execute();
//end new
}
});
alt.setNegativeButton("No",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
// TODO Auto-generated method stub
dialog.dismiss();
}
});
AlertDialog dialog = alt.create();
dialog.show();
return;
}
});
}
// I shouldn't have to comment on this one:
//etListAdapter(adapter);
// Optional: when the user clicks a list item we
//could do something. However, we will choose
//to do nothing...
//ListView lv = getListView();
//lv.setOnItemClickListener(new OnItemClickListener() {
//@Override
//public void onItemClick(AdapterView<?> parent, View view,
// int position, long id) {
// This method is triggered if an item is click within our
// list. For our example we won't be using this, but
// it is useful to know in real life applications.
//}
//});
// }
public class LoadComments extends AsyncTask<Void, Void, Boolean> {
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(Food.this);
pDialog.setMessage("Loading orders...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected Boolean doInBackground(Void... arg0) {
//we will develop this method in version 2
updateJSONdata();
return null;
}
@Override
protected void onPostExecute(Boolean result) {
super.onPostExecute(result);
pDialog.dismiss();
//we will develop this method in version 2
updateList();
}
}
//new
/*****************************************************************
* Background Async Task to Delete Product
* */
class DeleteProduct extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(Food.this);
pDialog.setMessage("Deleting Product...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Deleting product
* */
protected String doInBackground(String... args) {
// Check for success tag
int success;
try {
// Building Parameters
//List<NameValuePair> params = new ArrayList<NameValuePair>();
//params.add(new BasicNameValuePair("pid", pid));
// getting product details by making HTTP request
//JSONObject json = jsonParser.makeHttpRequest(
// url_delete_product, "POST", params);
JSONParser jParser = new JSONParser();
// Feed the beast our comments url, and it spits us
//back a JSON object. Boo-yeah Jerome.
JSONObject json = jParser.getJSONFromUrl(url_delete_product);
// check your log for json response
Log.d("Delete Product", json.toString());
// json success tag
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// product successfully deleted
// notify previous activity by sending code 100
Intent i = getIntent();
// send result code 100 to notify about product deletion
setResult(100, i);
finish();
}
} 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 product deleted
pDialog.dismiss();
}
}
}
foodordered.php
<?php
/*
Our "config.inc.php" file connects to database every time we include or require
it within a php script. Since we want this script to add a new user to our db,
we will be talking with our database, and therefore,
let's require the connection to happen:
*/
require("config.inc.php");
//initial query
$query = "Select * FROM foodordered";
//execute query
try {
$stmt = $db->prepare($query);
$result = $stmt->execute();
}
catch (PDOException $ex) {
$response["success"] = 0;
$response["message"] = "Database Error!";
die(json_encode($response));
}
// Finally, we can retrieve all of the found rows into an array using fetchAll
$rows = $stmt->fetchAll();
if ($rows) {
$response["success"] = 1;
$response["message"] = "Post Available!";
$response["posts"] = array();
foreach ($rows as $row) {
$post = array();
$post["seatnumber"] = $row["seatnumber"];
$post["foodordered"] = $row["foodordered"];
//$post["drinksordered"] = $row["drinksordered"];
//$post["services"] = $row["services"];
//update our repsonse JSON data
array_push($response["posts"], $post);
}
// echoing JSON response
echo json_encode($response);
} else {
$response["success"] = 0;
$response["message"] = "No Post Available!";
die(json_encode($response));
}
?>
如果您需要我的其他java，xml或php代码，请告诉我。 我选择项目时添加删除功能，它将删除该项目，但它不会从数据库中删除。请帮我查一下我的php代码或java代码是否有错误。 我是java编程的初学者，请尽可能帮忙。谢谢
答案 0 :(得分：0)
您根本不会发布id：
JSONObject json = jParser.getJSONFromUrl(url_delete_product);
您可以使用GET变量，并将其附加到网址，或执行有效的POST。
使用GET可能会这样：
JSONObject json = jParser.getJSONFromUrl(
url_delete_product+"?id="+idOfYourFoodItem);
并在PHP中获取ID，如下所示：
$id = $_GET['id'];