无法使用php+android从mysql检索数据
我正在尝试使用JSON和php从mysql获取一个简单的数据。我做了谷歌搜索到的一切。我可以插入数据,但无法检索。帮助我。提前谢谢 我已经完成了以下php代码来检索 获取_all_products.php 在JsonParsor之后,以下java代码在android中无法使用php+android从mysql检索数据,php,android,mysql,json,Php,Android,Mysql,Json,我正在尝试使用JSON和php从mysql获取一个简单的数据。我做了谷歌搜索到的一切。我可以插入数据,但无法检索。帮助我。提前谢谢 我已经完成了以下php代码来检索 获取_all_products.php 在JsonParsor之后,以下java代码在android中 您需要使用标题将其作为json响应,默认情况下,php将返回带有text/html的响应 不要使用mysql_*API,因为它已经被弃用了,使用起来非常灵活和安全 使用PDO 我认为这个链接对于那些完全是初学者的开发者来说是非常有
您需要使用标题将其作为json响应,默认情况下,php将返回带有text/html的响应 不要使用mysql_*API,因为它已经被弃用了,使用起来非常灵活和安全 使用PDO
我认为这个链接对于那些完全是初学者的开发者来说是非常有用的 Arockia遵循本教程。我相信这肯定会有帮助。 在这里,请查看此链接: [
注意:php和MYSQL教程将从17开始。从php代码中检索到的JSON数据是什么?我不完全了解php的概念,基本上是java开发人员。array\u push$response[产品],$product;这行代码是将数据推送到JSOon对象吗?它在Java端,products=json.getJSONArrayTAG_products;。感谢您的响应。检查您的logcat以获取代码的json响应。特别是这行代码:Log.dAll products:,json.toString;我没有得到响应。但接下来是错误解析ta org.json.JSONException:Value{products:[{pid:1akn9d0uul73q0d37u1jqnkbqj,名称:华硕手机,价格:10000,描述:预算知道,创建时间:2014年12月4日上午9:02:08,更新时间:2014年12月4日上午9:02:08},成功时间:1}当我运行那个php文件时,它给出了这个消息。但是没有得到输出。@SaqueibI在我的php代码中添加了标题'Content-type:application/json';Content。谢谢。这很好。但是我缺少一些东西。我没有得到输出。最后它帮助了我,并做了一些更正。标题'Content-type:application/json';需要一次'ur_db_配置ion“;$query_params[]=;$query=Select*FROM products;try{$stmt=$db->prepare$query;$result=$stmt->execute$query_params;}捕获异常$ex{$response[success]=0;$response[message]=数据库错误!;diejson_encode$response;}
<?php
$response = array();
require_once __DIR__ . '/db_connect.php';
$db = new DB_CONNECT();
$result = mysql_query("SELECT name,pid FROM products") or die(mysql_error());
if (mysql_num_rows($result) > 0) {
// looping through all results
// products node
$response["products"] = array();
while ($row = mysql_fetch_array($result)) {
// temp user array
$product = array();
$product["name"] = $row["name"];
$product["pid"] = $row["pid"];
// push single product into final response array
array_push($response["products"], $product);
}
$response["success"] = 1;
// echoing JSON response
echo json_encode($response);
} else {
$response["success"] = 0;
$response["message"] = "No products found";
// echo no users JSON
echo json_encode($response);
}
?>
public class AllProductsActivity extends ListActivity {
// Progress Dialog
private ProgressDialog pDialog;
// Creating JSON Parser object
JSONParser jParser = new JSONParser();
ArrayList<HashMap<String, String>> productsList;
// url to get all products list
private static String url_all_products = "http://10.0.2.2/android_connect/get_all_products.php";
// JSON Node names
private static final String TAG_SUCCESS = "success";
private static final String TAG_PRODUCTS = "products";
private static final String TAG_PID = "pid";
private static final String TAG_NAME = "name";
// products JSONArray
JSONArray products = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.all_products);
// Hashmap for ListView
productsList = new ArrayList<HashMap<String, String>>();
// Loading products in Background Thread
new LoadAllProducts().execute();
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 pid = ((TextView) view.findViewById(R.id.pid)).getText()
.toString();
// Starting new intent
Intent in = new Intent(getApplicationContext(),
EditProductActivity.class);
// sending pid to next activity
in.putExtra(TAG_PID, pid);
// starting new activity and expecting some response back
startActivityForResult(in, 100);
}
});
}
// 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(AllProductsActivity.this);
pDialog.setMessage("Loading products. 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_PRODUCTS);
// 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_PID);
String name = c.getString(TAG_NAME);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_PID, id);
map.put(TAG_NAME, name);
// adding HashList to ArrayList
productsList.add(map);
}
} else {
// no products found
// Launch Add New product Activity
Intent i = new Intent(getApplicationContext(),
NewProductActivity.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(
AllProductsActivity.this, productsList,
R.layout.list_item, new String[] { TAG_PID,
TAG_NAME},
new int[] { R.id.pid, R.id.name });
// updating listview
setListAdapter(adapter);
}
});
}
}
}
header('Content-type: application/json');
// echo no users JSON
echo json_encode($response);
$db = new PDO('mysql:host=localhost;dbname=testdb;charset=utf8', 'username', 'password');
try {
//connect as appropriate as above
$db->query('SELECT name,pid FROM products'); //invalid query!
$stmt = $db->query("SELECT * FROM table");
$result = $stmt->fetchAll(PDO::FETCH_ASSOC);
//Build your result here and response
} catch(PDOException $ex) {
echo "An Error occured!"; //user friendly message
some_logging_function($ex->getMessage());
}