Question

这是java的源代码：

package com.example.entrepreneurexpress;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONException;
import org.json.JSONObject;

import android.annotation.TargetApi;
import android.app.ActionBar;
import android.app.Activity;
import android.os.Build;
import android.os.Bundle;
import android.os.StrictMode;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class InvestorRegister extends Activity {

    EditText YourName;
    EditText email;
    EditText password;
    EditText confirmPassword;
    Button btnClear, btnRegister;

    String nm, emailAdd, cnfPass, pwd, result = null;
    int code;

    InputStream is = null;


    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.investors_registration);

        if(Build.VERSION.SDK_INT >= 9) {
            StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
            StrictMode.setThreadPolicy(policy);
        }

        ActionBar aBar = getActionBar();
        aBar.setDisplayHomeAsUpEnabled(true);

        YourName = (EditText) findViewById(R.id.invRegName);
        email = (EditText) findViewById(R.id.invRegEmail);
        password = (EditText) findViewById(R.id.invRegPassword);
        confirmPassword = (EditText) findViewById(R.id.invRegConfPassword);

        btnRegister = (Button) findViewById(R.id.btnInvRegRegister);
        btnRegister.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {

                if(
                    (YourName.getText().toString().equals("")) &&
                    (email.getText().toString().equals("")) &&
                    (password.getText().toString().equals(""))
                  ) {
                    Toast.makeText(getApplicationContext(), "Please Fill In All The Details", Toast.LENGTH_LONG).show();
                } else {
                    nm = YourName.getText().toString();
                    emailAdd = email.getText().toString();
                    pwd = password.getText().toString();

                    ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
                    nameValuePairs.add(new BasicNameValuePair(nm, email.getText().toString()));
                    nameValuePairs.add(new BasicNameValuePair(emailAdd, emailAdd));
                    nameValuePairs.add(new BasicNameValuePair(pwd, password.getText().toString()));

                     try{
                         HttpClient httpclient = new DefaultHttpClient();
                         HttpPost httppost = new HttpPost("http://www.bijukathemovie.com/insert.php");
                         httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
                         HttpResponse response = httpclient.execute(httppost);
                         HttpEntity entity = response.getEntity();
                         is = entity.getContent();

                         Log.e("log_tag", "connection success ");
                         Toast.makeText(getApplicationContext(), "pass", Toast.LENGTH_SHORT).show();
                     } catch(Exception e) {
                        Log.e("log_tag", "Error in http connection "+e.toString());
                        Toast.makeText(getApplicationContext(), "Connection fail", Toast.LENGTH_SHORT).show();
                     }

                     try{
                         BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8);
                         StringBuilder sb = new StringBuilder();
                         String line = null;
                         while ((line = reader.readLine()) != null) {
                             sb.append(line + "\n");                                
                         }
                         is.close();
                         result=sb.toString();
                     } catch(Exception e) {
                        Log.e("log_tag", "Error converting result "+e.toString());
                     }

                     try {
                         JSONObject json_data = new JSONObject(result);
                         CharSequence w = (CharSequence) json_data.get("re");
                         Toast.makeText(getApplicationContext(), w, Toast.LENGTH_SHORT).show();
                     } catch (JSONException e) {
                         Log.e("log_tag", "Error parsing data "+e.toString());
                         Toast.makeText(getApplicationContext(), "JsonArray fail", Toast.LENGTH_SHORT).show();
                     }
                }
            }
        });
    }
}

这是PHP代码：

<?php

require_once("storescripts/dbconnect.php");

    $name=$_POST['nm'];
    $emailAdd=$_POST['emailAdd'];
    $pwd=$_POST['pwd'];

    $q="INSERT INTO Investors(invName, invEmail, invPassword) VALUES('".$name."', '".$emailAdd."', '".$pwd."')";
    $s= mysqli_query($con, $q);

    if(!$s) {
        $r["re"]="Inserting problem in database";
        print(json_encode($r));
    } else {
        $r["re"]="Record inserted successfully";
        print(json_encode($r));
    }

mysqli_close($con);
?>

您可以看到图片here

我正在关注this教程来完成我的工作。但是当我在我的设备上运行应用程序时，它工作正常，当在数据库中检查交叉时，我在数据库中获得NULL值。 NULL含义 - 数据库中没有输入。它是空白的。

请帮助我。感谢。

Answer 1

这是因为你定义的nameValuePairs

nameValuePairs.add(new BasicNameValuePair("invName", 
                                          YourName.getText().toString()));
nameValuePairs.add(new BasicNameValuePair("invEmail", 
                                          email.getText().toString()));
nameValuePairs.add(new BasicNameValuePair("invPassword", 
                                          password.getText().toString()));

BasicNameValuePair构造函数接受参数

name作为查询参数的名称
value作为上述参数

您提供的姓名为invName，invEmail和invPassword。

但是在你的脚本中，你正在阅读查询参数

$name=$_POST['nm'];
$emailAdd=$_POST['emailAdd'];
$pwd=$_POST['pwd'];

由于nm，emailAdd和pwd不是使用BasicNameValuePair设置的名称，因此从_POST读取NULL会产生nameValuePairs.add(new BasicNameValuePair("nm", YourName.getText().toString())); nameValuePairs.add(new BasicNameValuePair("emailAdd", email.getText().toString())); nameValuePairs.add(new BasicNameValuePair("pwd", password.getText().toString())); 。

并将相同的内容传递给数据库，因此您会看到插入的NULL数据。

在应用代码中进行如下更改：

$name=$_POST['invName'];
$emailAdd=$_POST['invEmail'];
$pwd=$_POST['invPassword'];

或更改脚本文件以将查询参数读取为：

{{1}}

然后运行你的程序。

Android：在mysql表中注册时插入空值

1 个答案: