我有这个使用JSON从数据库获取信息的android项目。现在，我的问题是如何更新数据库中的现有数据（假设我想要更新值为“0”的“status”列，并且我想将其设为“1”）。那可能吗？这是我的代码：
newsfeed_liip_pallet_purchase_order_update.php
<?php
//load and connect to MySQL database stuff
require("config.inc.php");
if (!empty($_POST)) {
//initial query
$query = "UPDATE pims_liip_pallet_purchase_order ( status ) VALUES ( :status ) ";
//Update query
$query_params = array(
':status' => $_POST['status'],
);
//execute query
try {
$stmt = $db->prepare($query);
$result = $stmt->execute($query_params);
}
catch (PDOException $ex) {
// For testing, you could use a die and message.
//die("Failed to run query: " . $ex->getMessage());
//or just use this use this one:
$response["success"] = 0;
$response["message"] = "Database Error. Couldn't update post!";
die(json_encode($response));
}
$response["success"] = 1;
$response["message"] = "Successfully Updated!";
echo json_encode($response);
} else {
?>
<?php
}
?>
PalletPurchaseOrder_Clicked.java
package com.pallet.pts;
public class PalletPurchaseOrder_Clicked extends Activity implements OnClickListener {
// Connection detector
ConnectionDetector cd;
// Alert dialog manager
AlertDialogManager alert = new AlertDialogManager();
// Progress Dialog
private ProgressDialog pDialog;
private Button bApprove, bDisapprove;
// Creating JSON Parser object
JSONParser jsonParser = new JSONParser();
// Newsfeed JSONArray
JSONArray mNewsfeed = null;
// Newsfeed id
String newsfeed_id = null;
// URL for data parsing
private static final String READ_COMMENTS_URL = "http://192.168.0.101/PMR_Drupal/sites/all/modules/eclipse/newsfeed_liip_pallet_purchase_order_update.php";
private static final String TAG_SUCCESS = "success";
private static final String TAG_MESSAGE = "message";
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.pallet_purchase_order_clicked);
getActionBar().setDisplayHomeAsUpEnabled(true);
cd = new ConnectionDetector(getApplicationContext());
// Check if Internet present
if (!cd.isConnectingToInternet()) {
// Internet Connection is not present
alert.showAlertDialog(PalletPurchaseOrder_Clicked.this, "Internet Connection Error",
"Please connect to working Internet connection", false);
// stop executing code by return
return;
}
// Approve and Disapprove Buttons
bApprove = (Button)findViewById(R.id.btnApprove);
bApprove.setOnClickListener(this);
bDisapprove = (Button)findViewById(R.id.btnApprove);
bDisapprove.setOnClickListener(this);
// Actionbar
ActionBar ab = getActionBar(); //need import android.app.ActionBar;
ColorDrawable colorDrawable = new ColorDrawable(Color.parseColor("#0089fd"));
ab.setBackgroundDrawable(colorDrawable);
// Get intent from the other page
Intent in = getIntent();
po_number = in.getStringExtra("po_number");
date_created = in.getStringExtra("date_created");
trans_name = in.getStringExtra("trans_name");
supplier = in.getStringExtra("supplier");
section_from = in.getStringExtra("section_from");
term_name = in.getStringExtra("term_name");
total_amount = in.getStringExtra("total_amount");
delivery_date = in.getStringExtra("delivery_date");
date_requested = in.getStringExtra("date_requested");
requested_by = in.getStringExtra("requested_by");
prepared_by = in.getStringExtra("prepared_by");
product_code = in.getStringExtra("product_code");
product_description = in.getStringExtra("product_description");
date_prepared = in.getStringExtra("date_prepared");
quantity = in.getStringExtra("quantity");
unit_price = in.getStringExtra("unit_price");
total_amount_paid = in.getStringExtra("total_amount_paid");
qty_delivered = in.getStringExtra("qty_delivered");
notes = in.getStringExtra("notes");
status = in.getStringExtra("status");
status_id = in.getStringExtra("status_id");
// calling background thread
new LoadClicked().execute();
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
new LoadClicked().execute();
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
switch (item.getItemId()) {
// Respond to the action bar's Up/Home button
case android.R.id.home:
NavUtils.navigateUpFromSameTask(this);
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* Background Async Task to get single song information
* */
class LoadClicked extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(PalletPurchaseOrder_Clicked.this);
pDialog.setMessage("Updating Content...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* getting song json and parsing
* */
protected String doInBackground(String... args) {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
// post id as GET parameters
params.add(new BasicNameValuePair("po_number", po_number));
// getting JSON string from URL
JSONParser jParser = new JSONParser();
JSONObject json = jParser.getJSONFromUrl(READ_COMMENTS_URL);
try {
JSONObject jObj = new JSONObject();
if(jObj != null){
date_created = jObj.getString(TAG_DATE_CREATED);
po_number = jObj.getString(TAG_PO);
trans_name = jObj.getString(TAG_TITLE);
supplier = jObj.getString(TAG_SUPPLIER);
section_from = jObj.getString(TAG_SECTION);
term_name = jObj.getString(TAG_TERM);
total_amount = jObj.getString(TAG_TOTAL_AMOUNT);
delivery_date = jObj.getString(TAG_DELIVERY_DATE);
date_requested = jObj.getString(TAG_DATE_REQUESTED);
requested_by = jObj.getString(TAG_REQUESTED_BY);
prepared_by = jObj.getString(TAG_PREPARED_BY);
product_code = jObj.getString(TAG_PRODUCT_CODE);
product_description = jObj.getString(TAG_PRODUCT_DESCRIPTION);
quantity = jObj.getString(TAG_QUANTITY);
unit_price = jObj.getString(TAG_UNIT_PRICE);
total_amount_paid = jObj.getString(TAG_TOTAL_AMOUNT_PAID);
qty_delivered = jObj.getString(TAG_QTY_DELIVERED);
notes = jObj.getString(TAG_NOTES);
status = jObj.getString(TAG_STATUS);
status_id = jObj.getString(TAG_STATUS_ID);
}
} 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 song information
pDialog.dismiss();
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
TextView txt_ref_number = (TextView) findViewById(R.id.tvPTRef);
TextView txt_po_number = (TextView) findViewById(R.id.tvPONumber);
TextView txt_trans_name = (TextView) findViewById(R.id.title);
TextView txt_date_created = (TextView) findViewById(R.id.tvDateCreated);
TextView txt_supplier = (TextView) findViewById(R.id.tvSupplier);
TextView txt_section = (TextView) findViewById(R.id.tvShipTo);
TextView txt_term_name = (TextView) findViewById(R.id.tvTerm);
TextView txt_total_amount = (TextView) findViewById(R.id.tvTotalAmount);
TextView txt_delivery_date = (TextView) findViewById(R.id.tvDeliveryDate);
TextView txt_date_requested = (TextView) findViewById(R.id.tvDateRequested);
TextView txt_requested_by = (TextView) findViewById(R.id.tvRequestedBy);
TextView txt_prepared_by = (TextView) findViewById(R.id.tvPreparedBy);
TextView txt_product_code = (TextView) findViewById(R.id.tvProductCode);
TextView txt_product_description = (TextView) findViewById(R.id.tvProductDescription);
TextView txt_quantity = (TextView) findViewById(R.id.tvQuantity);
TextView txt_unit_price = (TextView) findViewById(R.id.tvUnitPrice);
TextView txt_total_amount_paid = (TextView) findViewById(R.id.tvTotalAmountPaid);
TextView txt_qty_delivered = (TextView) findViewById(R.id.tvQtyDelivered);
TextView txt_notes = (TextView) findViewById(R.id.tvNotes);
TextView txt_status = (TextView) findViewById(R.id.tvStatus);
TextView txt_status_id = (TextView) findViewById(R.id.tvStatusID);
//displaying data in view
txt_ref_number.setText(ref_number);
txt_po_number.setText(po_number);
txt_trans_name.setText(trans_name);
txt_date_created.setText(date_created);
txt_supplier.setText(supplier);
txt_section.setText(section_from);
txt_term_name.setText(term_name);
txt_total_amount.setText(total_amount);
txt_delivery_date.setText(delivery_date);
txt_date_requested.setText(date_requested);
txt_requested_by.setText(requested_by);
txt_prepared_by.setText(prepared_by);
txt_product_code.setText(product_code);
txt_product_description.setText(product_description);
txt_quantity.setText(quantity);
txt_unit_price.setText(unit_price);
txt_total_amount_paid.setText(total_amount_paid);
txt_qty_delivered.setText(qty_delivered);
txt_notes.setText(notes);
txt_status.setText(status);
txt_status_id.setText(status_id);
// Condition for Status
if (status.equals("For Approval")){
Button b1 = (Button) findViewById (R.id.btnApprove);
b1.setVisibility(View.VISIBLE);
Button b2 = (Button) findViewById (R.id.btnDisApprove);
b2.setVisibility(View.VISIBLE);
} else {
Button b1 = (Button) findViewById (R.id.btnApprove);
b1.setVisibility(View.GONE);
Button b2 = (Button) findViewById (R.id.btnDisApprove);
b2.setVisibility(View.GONE);
}
// Change Activity Title with preferred title
setTitle(po_number);
}
});
}
}
}
如何更新状态？我希望你能帮助我：D提前谢谢！
答案 0 :(得分：0)
您可以向网页发送HTTP请求（GET或POST，敏感数据的POST）。然后，服务器将解析数据，就好像它来自html＆lt; form＆gt;。
根据这个（相当过时）blog post，对于Android 2.3及更高版本，首选方法是HttpUrlConnection。对于较旧的系统，请查看org.apache.http包甚至android.net.http。
在SO上也有类似的问题使用HttpUrlConnection（PHP HTTP POST on Android device using HttpURLConnection）。