我正在开发一个通过php脚本连接到远程mysql数据库的Android应用程序。该脚本应该查询数据库，并通过JSON数据返回结果。我正在尝试使用userID并返回与该用户相关的数据，例如fistname，company和position。
它返回JSON数据，但无论是搜索现有的userID，不存在的用户ID还是将editText字段留空，它总是一样的。基本上，这个if语句总是解析为false：if (!empty($result))所以这总是结果：$response["message"] = "User not found 2";
这是我的PHP脚本：
<?php
require("config.inc.php");
// array for JSON response
$response = array();
// check for post data
if (isset($_GET['userID'])) {
$userid = $_GET['userID'];
// get a product from products table
$result = mysql_query("SELECT * FROM users WHERE id = $userid");
if (!empty($result)) { //<-------This is always resovling to false even when I leave the editText field blank ----------
// check for empty result
if (mysql_num_rows($result) > 0) {
$result = mysql_fetch_array($result);
$user = array();
$user["userid"] = $result["userid"];
$user["firstname"] = $result["firstname"];
$user["company"] = $result["company"];
$user["position"] = $result["position"];
// success
$response["success"] = 1;
// user node
$response["user"] = array();
array_push($response["user"], $user);
// echoing JSON response
echo json_encode($response);
} else {
// no product found
$response["success"] = 0;
$response["message"] = "User not found 1";
// echo no users JSON
echo json_encode($response);
}
} else {
// no product found
$response["success"] = 0;
$response["message"] = "User not found 2"; //--------------THIS IS THE RESULT THAT IS ALWAYS RETURNED----------------
// echo no users JSON
echo json_encode($response);
}
} else {
// required field is missing
$response["success"] = 0;
$response["message"] = "Required field is missing";
// echoing JSON response
echo json_encode($response);
}
?>
这是我的android java文件：
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.view.Window;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.List;
public class SearchByUserID extends ActionBarActivity implements View.OnClickListener {
// Buttons
private Button mSubmitButton, mBackButton;
// EditText Field
EditText enterUserID;
// Progress Dialog
private ProgressDialog pDialog;
// JSON parser class
JSONParser jsonParser = new JSONParser();
// Variable for holding URL:
private static final String LOGIN_URL = "http://www.website.com/webservice/searchbyuserid.php";
//JSON element ids from response of php script:
private static final String TAG_SUCCESS = "success";
private static final String TAG_MESSAGE = "message";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.supportRequestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.search_by_user_id_layout);
mSubmitButton = (Button)findViewById(R.id.submit);
mBackButton = (Button)findViewById(R.id.back);
mSubmitButton.setOnClickListener(this);
mBackButton.setOnClickListener(this);
enterUserID = (EditText)findViewById(R.id.enterUserIdNumber);
enterUserID.addTextChangedListener(new TextWatcher() {
int keyDel;
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
enterUserID.setOnKeyListener(new View.OnKeyListener() {
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_DEL)
keyDel = 1;
return false;
}
});
if (keyDel == 0) {
int len = enterUserID.getText().length();
if(len == 2 || len == 6) {
enterUserID.setText(enterUserID.getText() + "-");
enterUserID.setSelection(enterUserID.getText().length());
}
} else {
keyDel = 0;
}
}
@Override
public void afterTextChanged(Editable editable) {
}
});
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.submit:
new SearchUserId().execute();
break;
case R.id.back:
finish();
break;
default:
break;
}
}
class SearchUserId extends AsyncTask<String, String, String> {
// Show progress dialog
boolean failure = false;
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(SearchByUserID.this);
pDialog.setMessage("Searching User ID...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected String doInBackground(String... args) {
// Check for success tag
int success;
String userID = enterUserID.getText().toString();
try {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("userID", userID));
Log.d("request!", "starting");
JSONObject json = jsonParser.makeHttpRequest(LOGIN_URL, "GET", params);
// check your log for json response
Log.d("Login attempt", json.toString());
// json success tag
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
Log.d("User ID Found!", json.toString());
Intent i = new Intent(SearchByUserID.this, HomeActivity.class);
finish();
startActivity(i);
return json.getString(TAG_MESSAGE);
}else{
Log.d("User ID not found.", json.getString(TAG_MESSAGE));
return json.getString(TAG_MESSAGE);
}
} 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();
if (file_url != null){
Toast.makeText(SearchByUserID.this, file_url, Toast.LENGTH_LONG).show();
}
}
}
}