Question

我正在创建一个可以使用输入单词的最后一个字母检索单词的应用程序。例如，在我的现有数据库中，序列是Appl e ＆gt; E lephan t ＆gt; T rai n ＆gt; N erv e ＆gt; E ducatio n ＆gt; N ewspape r ＆gt;我会输入 R ecipe，因为那是前一个单词的最后一个字母。我的问题是我无法得到答复。应用程序必须提供一个单词，该单词以前一个单词的最后一个字母开头。所以在tblcheckword中，响应必须是 E mphasis或 E mpire，因为在我的查询中它是在rand（）和LIMIT到1

SELECT word FROM tblcheckword WHERE word LIKE '$word.%' ORDER BY rand() NOT IN (SELECT ig_word FROM tbltempgame) LIMIT 1;

我正在使用LIKE语句来获取输入单词的最后一个字母。但我仍然得到错误。

这是我的PHP文件“checkplsv2.php”

<?php
$con = mysqli_connect("localhost", "root", "1234", "check") or die ("Error ".mysqli_error($con));
$word = $_POST["word"];
$sql = "SELECT word FROM tblcheckword where word like '$word.%' order by rand() not in (select ig_word from tbltempgame) LIMIT 1";
$result = mysqli_query($con, $sql) or die("Error in selecting ".mysqli_error($con));

$response = array();
if(mysqli_num_rows($result) > 0){
    while($row = mysqli_fetch_array($result))
    {
        array_push($response, array("id"=>$row[0],"ig_word"=>$row[1],"meaning"=>$row[2]));
        $retrieve = $row[1];
    }
    echo json_encode(array("server_response" => $retrieve));
}else{
    echo "Retrieve failed";
}

mysqli_close($con);


?>

这是我的MainActivity.java

package com.example.keam.lastnato;

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

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

public class MainActivity extends Activity {

String id;
String word;
String ig_word;
InputStream is = null;
String result = null;
String line = null;
String data = "";
TextView disp;
String url = "http://192.168.22.16/checkplsv2.php";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    final EditText e_word = (EditText) findViewById(R.id.editText1);
    Button select = (Button) findViewById(R.id.button1);
    select.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            word = e_word.getText().toString();
            select();
        }
    });
}

void select() {

    class readThis extends AsyncTask<String, Void, String> {

        @Override
        protected String doInBackground(String... params) {

ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();

            nameValuePairs.add(new BasicNameValuePair("word", word));

            try {
                HttpClient httpclient = new DefaultHttpClient();
                HttpPost httppost = new HttpPost(params[0]);
                httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
                HttpResponse response = httpclient.execute(httppost);
                HttpEntity entity = response.getEntity();
                is = entity.getContent();
                Log.e("pass 1", "connection success ");
            } catch (Exception e) {
                Log.e("Fail 1", e.toString());
                Toast.makeText(getApplicationContext(), "Invalid IP Address",
                        Toast.LENGTH_LONG).show();
            }

            try {
                BufferedReader reader = new BufferedReader
                        (new InputStreamReader(is, "iso-8859-1"), 8);

                StringBuilder sb = new StringBuilder();
                while ((line = reader.readLine()) != null) {
                    sb.append(line);
                }
                is.close();
                result = sb.toString();
                Log.e("pass 2", "connection success ");
            } catch (Exception e) {
                Log.e("Fail 2", e.toString());
            }


            return result;
        }

        @Override
        protected void onPostExecute(String result) {

            try {
                JSONObject json_data = new JSONObject(result);
                ig_word = json_data.getString("server_response");
                Toast.makeText(getBaseContext(), "Name: " +   
                ig_word,Toast.LENGTH_SHORT).show();
                TextView disp = (TextView) findViewById(R.id.textView);
                disp.setText(ig_word);

            } catch (JSONException e) {
                Log.e("Fail 3", e.toString());
                Log.e("log_tag", "Failed data was: " + result);
            }

        }

        @Override
        protected void onPreExecute() {
        }

        @Override
        protected void onProgressUpdate(Void... values) {
        }

    }

    readThis hello = new readThis();
    hello.execute(new String[]{url});
    }
}

这是我的activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.keam.lastnato.MainActivity">

<EditText
    android:id="@+id/editText1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="39dp"
    android:padding="11dp"
    android:hint="Player's Turn"
    android:ems="10"
    android:inputType="text">

    <requestFocus />
</EditText>

<Button
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/editText1"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="24dp"
    android:onClick="parseJSON"
    android:padding="11dp"
    android:text="Select" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="New Text"
    android:id="@+id/textView"
    android:layout_centerVertical="true"
    android:layout_centerHorizontal="true" />
</RelativeLayout>

这是我在WAMP phpmyadmin中的tblcheckword和tbltempgame

数据库名称=“检查”

这是我的logcat错误。

09-04 19:23:52.051 11820-11820/com.example.keam.lastnato E/dalvikvm: Could not find class 'android.os.PersistableBundle', referenced from method com.example.keam.lastnato.MainActivity.access$super
09-04 19:23:52.051 11820-11820/com.example.keam.lastnato E/dalvikvm: Could not find class 'android.os.PersistableBundle', referenced from method com.example.keam.lastnato.MainActivity.access$super
09-04 19:23:52.051 11820-11820/com.example.keam.lastnato E/dalvikvm: Could not find class 'android.media.session.MediaController', referenced from method com.example.keam.lastnato.MainActivity.access$super
09-04 19:23:52.051 11820-11820/com.example.keam.lastnato E/dalvikvm: Could not find class 'android.widget.Toolbar', referenced from method com.example.keam.lastnato.MainActivity.access$super
09-04 19:23:52.061 11820-11820/com.example.keam.lastnato E/dalvikvm: Could not find class 'android.app.ActivityManager$TaskDescription', referenced from method com.example.keam.lastnato.MainActivity.access$super
09-04 19:23:52.071 11820-11820/com.example.keam.lastnato E/dalvikvm: Could not find class 'android.app.SharedElementCallback', referenced from method com.example.keam.lastnato.MainActivity.access$super
09-04 19:23:52.071 11820-11820/com.example.keam.lastnato E/dalvikvm: Could not find class 'android.os.PersistableBundle', referenced from method com.example.keam.lastnato.MainActivity.access$super
09-04 19:23:52.071 11820-11820/com.example.keam.lastnato E/dalvikvm: Could not find class 'android.app.SharedElementCallback', referenced from method com.example.keam.lastnato.MainActivity.access$super
09-04 19:23:52.081 11820-11820/com.example.keam.lastnato E/dalvikvm: Could not find class 'android.app.assist.AssistContent', referenced from method com.example.keam.lastnato.MainActivity.access$super
09-04 19:23:52.091 11820-11820/com.example.keam.lastnato E/dalvikvm: Could not find class 'android.view.SearchEvent', referenced from method com.example.keam.lastnato.MainActivity.access$super
09-04 19:23:52.091 11820-11820/com.example.keam.lastnato E/dalvikvm: Could not find class 'android.os.PersistableBundle', referenced from method com.example.keam.lastnato.MainActivity.access$super
09-04 19:24:01.960 11820-12003/com.example.keam.lastnato E/pass 1: connection success 
09-04 19:24:01.960 11820-12003/com.example.keam.lastnato E/pass 2: connection success 
09-04 19:24:01.960 11820-11820/com.example.keam.lastnato E/Fail 3: org.json.JSONException: Value Retrieve of type java.lang.String cannot be converted to JSONObject
09-04 19:24:01.960 11820-11820/com.example.keam.lastnato E/log_tag: Failed data was: Retrieve failed

Answer 1

你的sql不正确。

试试这个：

 $sql = "SELECT `word` FROM `tblcheckword`WHERE `word` LIKE ".$word."% NOT IN(select ig_word from tbltempgame)  ORDER BY RAND()  LIMIT 1";

如何在PHP Query中编写LIKE语句？

1 个答案: