没有这样的表 - 在 SQLite Android 中插入值时出错 [重复]

Question

我想开发一个需要在 Android 中使用 SQLite 数据库的应用程序。下面是显示的代码，它使用随机数据实现数据库及其应用程序所需的所有操作（只是为了首先成功实现逻辑）。

这段代码是用 DBHelperDisplay.java 编写的，它由 MainActivity.java 通过 Intent 调用。

我的 DBHelperDisplay.java ：

package course.examples.jumboquest;

import java.util.Random;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
//import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
//import android.content.Intent;
import android.os.CountDownTimer;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.DatabaseUtils;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteDatabase;

public class DBHelperDisplay extends ActionBarActivity {

TextView tv; 
DBHelper myDB;
RadioGroup radioChoices;
RadioButton rbtChoice; 
Button btSubmit;
String choice1;
String choice2;
String choice3;
String choice4;
String strAns;
CustomTimer cdt;

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

    cdt = new CustomTimer(20000, 1000);
    cdt.start();

    myDB = new DBHelper(this);

    myDB.insertQuestion(1, "who is the team member whose name starts with s?", "Vinita", "Akanksha", "Swati", "Megha", "Swati");
    myDB.insertQuestion(2, "who is the team member whose name starts with m?", "Vinita", "Akanksha", "Swati", "Megha", "Megha");
    myDB.insertQuestion(3, "who is the team member whose name starts with a?", "Vinita", "Akanksha", "Swati", "Megha", "Akanksha");
    myDB.insertQuestion(4, "who is the team member whose name starts with v?", "Vinita", "Akanksha", "Swati", "Megha", "Vinita");
    myDB.insertQuestion(5, "who is the team member whose name ends with i?", "Vinita", "Akanksha", "Swati", "Megha", "Swati");

    Cursor rs = myDB.getData();
    String Question = rs.getString(rs.getColumnIndex(DBHelper.Col_Ques));
    choice1 = rs.getString(rs.getColumnIndex(DBHelper.Col_Choice1));
    choice2 = rs.getString(rs.getColumnIndex(DBHelper.Col_Choice2));
    choice3 = rs.getString(rs.getColumnIndex(DBHelper.Col_Choice3));
    choice4 = rs.getString(rs.getColumnIndex(DBHelper.Col_Choice4));
    strAns = rs.getString(rs.getColumnIndex(DBHelper.Col_Ans));


    tv = (TextView) findViewById(R.id.timertxt);

    final TextView quest = (TextView) findViewById(R.id.quest);
    quest.setText(Question);

    //final TextView ans = (TextView) findViewById(R.id.ans);

    Button btClear = (Button)findViewById(R.id.btClear);
    btClear.setText("CLEAR");

   addListenerRadioChoices() ;

   btClear.setOnClickListener(new View.OnClickListener(){
     public void onClick(View v) {
        //ans.setText("");

       }
  });
 }
    public void addListenerRadioChoices(){ 

    radioChoices = (RadioGroup) findViewById(R.id.radioChoices);

    ((RadioButton) radioChoices.getChildAt(0)).setText(choice1); 
    ((RadioButton) radioChoices.getChildAt(1)).setText(choice2);
    ((RadioButton) radioChoices.getChildAt(2)).setText(choice3);
    ((RadioButton) radioChoices.getChildAt(3)).setText(choice4);

    btSubmit = (Button)findViewById(R.id.btSubmit); 
    btSubmit.setText("SUBMIT");
    btSubmit.setOnClickListener(new View.OnClickListener(){
     public void onClick(View v) {

        int selected = radioChoices.getCheckedRadioButtonId();
        rbtChoice = (RadioButton) findViewById(selected); 
        String Ans = rbtChoice.getText().toString();
         if(Ans.equalsIgnoreCase(strAns)){

            cdt.cancel();
            //ans.setText(" ANSWER");

         }
        /* else{
            //  ans.setText("WRONG ANSWER");
         }*/

    }
   });
  } 

public class CustomTimer extends CountDownTimer{
    //TextView ed;
    public CustomTimer(long millisInFuture, long countDownInterval){
        super(millisInFuture, countDownInterval);
    }
    @Override
    public void onTick(long millisUntilFinished){
        //current = millisUntilFinished/1000;
        tv.setText("Time Left:" + millisUntilFinished/1000);
    }
    @Override
    public void onFinish() {
        tv.setText("Time Up - lost the game!");
    }
}

public class DBHelper extends SQLiteOpenHelper {

    public static final String Database_Name = "Questions.db"; 
    public static final String Table_Name = "Comics"; 
    public static final String Col_ID = "id"; 
    public static final String Col_Ques = "question"; 
    public static final String Col_Choice1 = "choice1"; 
    public static final String Col_Choice2 = "choice2"; 
    public static final String Col_Choice3 = "choice3"; 
    public static final String Col_Choice4 = "choice4"; 
    public static final String Col_Ans = "answer"; 

    public DBHelper(Context context){
        super(context, Database_Name, null, 1);
    }
    @Override 
    public void onCreate(SQLiteDatabase db){
        // TODO Auto-generated method stub  
       db.execSQL(
       "CREATE TABLE Comics" +
       "(id integer primary key, question text, choice1 text, choice2 text, choice3 text, choice4 text, answer text)");

    }   
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
          // TODO Auto-generated method stub
          db.execSQL("DROP TABLE IF EXISTS Comics");
          onCreate(db);
    }

    public boolean insertQuestion(int id, String question, String choice1, String choice2, String choice3, String choice4, String answer){
        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues contentValues = new ContentValues();

        contentValues.put("id",id);
        contentValues.put("question",question);
        contentValues.put("choice1",choice1);
        contentValues.put("choice2",choice2);
        contentValues.put("choice3",choice3);
        contentValues.put("choice4",choice4);
        contentValues.put("answer",answer);
        db.insert("Comics", null, contentValues);
        db.close();
        return true;
    }
    public Cursor getData(){
        SQLiteDatabase db = this.getReadableDatabase();
        int numRows = (int)DatabaseUtils.queryNumEntries(db,Table_Name);
        int min = 1;
        int max = numRows;
        Random r = new Random();
        int id = r.nextInt(max - min + 1) + min;
        Cursor res= db.rawQuery("Select * from Comics where id = " + id + "", null);
        return res;
    }
}

}

我的 AndroidManifest.xml 文件：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="course.examples.jumboquest"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="21" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name=".MainActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name=".DBHelperDisplay"></activity>
</application>

</manifest>

在执行上述代码时，我收到以下错误：

我搜索了很多，发现很多堆栈溢出链接都有同样的问题，但仍然没有解决。我是这个话题的新手。请帮帮我。

Answer 1

我有两个适配器：

公共类 DBController_for_drivinglicense 扩展 SQLiteOpenHelper {

public DBController_for_drivinglicense(Context applicationcontext) {
    super(applicationcontext,"nozadb", null, 1);

}
//Creates Table
@Override
public void onCreate(SQLiteDatabase database) {

    String query;
    query = "CREATE TABLE if not exists drivinglicense ( id INTEGER PRIMARY KEY, comment TEXT,rates float,names TEXT,date DEFAULT CURRENT_TIMESTAMP, udpateStatus TEXT)";
    database.execSQL(query);
}

第一个适配器是：

public DBController_for_landregistration(Context applicationcontext) {
    super(applicationcontext,"nozadb", null, 1);
}

@Override
public void onCreate(SQLiteDatabase database) {
    String query;

    query = "CREATE TABLE if not exists landregistration ( id INTEGER PRIMARY KEY, comment TEXT,rates float,names TEXT,date DEFAULT CURRENT_TIMESTAMP, udpateStatus TEXT)";
    database.execSQL(query);

}

当我将第二个更改为：

公共类 DBController_for_drivinglicense 扩展 SQLiteOpenHelper {

public DBController_for_drivinglicense(Context applicationcontext) {
    super(applicationcontext,"nozadb", null, 2);
}
//Creates Table
@Override
public void onCreate(SQLiteDatabase database) {

    String query;
    query = "CREATE TABLE if not exists drivinglicense ( id INTEGER PRIMARY KEY, comment TEXT,rates float,names TEXT,date DEFAULT CURRENT_TIMESTAMP, udpateStatus TEXT)";
    database.execSQL(query);

}