的SQLite与Android错误

Question

我是比较新的编程和Android，以及我工作的一个小记事本程序。我学会了如何从Web上的教程中使用SQLite，但有些事情是错误的。当我运行应用程序时，它一直告诉我名称中没有列......但是有！我究竟做错了什么？我检查了几十次的语法，并且我像做了一个一个的教程一样。我知道这个问题在不止一次之前在这里，但是在阅读答案时，我仍然无法找到解决我的具体问题的方法。基本上我只是添加了2个带有标题和文本的注释，并且希望将它们呈现在ListView的主要活动中，但由于数据库问题没有任何显示。
帮助是非常非常感谢:)提前

这THX是类：

import java.util.ArrayList; 

import android.content.ContentValues; 
import android.content.Context; 
import android.database.Cursor; 
import android.database.sqlite.SQLiteDatabase; 
import android.database.sqlite.SQLiteDatabase.CursorFactory; 
import android.database.sqlite.SQLiteOpenHelper; 

public class DatabaseManager extends SQLiteOpenHelper{ 

    private static final String DATABASE_NAME = "notesDb"; 
    private static final int DATABASE_VERSION = 1; 

    private static final String TABLE_NAME = "notes"; 
    private static final String NOTE_ID = "_id"; 
    private static final String NOTE_TITLE = "title"; 
    private static final String NOTE_TEXT = "text"; 
    private static final String NOTE_CREATION_DATE = "creationDate"; 

    public DatabaseManager(Context context){ 

     super(context, DATABASE_NAME, null, DATABASE_VERSION); 

    } 

    @Override 
    public void onCreate(SQLiteDatabase db) { 
     String CREATE_NOTES_TABLE = "CREATE TABLE "+TABLE_NAME+"(" + NOTE_ID +" INTEGER PRIMARY KEY,"+ NOTE_TITLE + "TEXT," 
       + NOTE_TEXT + "TEXT," + NOTE_CREATION_DATE + "TEXT" + ")"; 
     db.execSQL(CREATE_NOTES_TABLE); 

    } 

    @Override 
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
     db.execSQL("DROP TABLE IF EXISTS" + TABLE_NAME); 
     onCreate(db); 

    } 

    public void addNote(Note note){ 
     SQLiteDatabase db = this.getWritableDatabase(); 

     ContentValues values = new ContentValues(); 
     values.put(NOTE_TITLE, note.getTitle()); 
     values.put(NOTE_TEXT, note.getText()); 
     values.put(NOTE_CREATION_DATE, note.getCurrentTime()); 

     db.insert(TABLE_NAME, null, values); 
     db.close(); 

    } 

    public void deleteNote(Note note){ 
     SQLiteDatabase db = this.getWritableDatabase(); 

     db.delete(TABLE_NAME, NOTE_ID + "?=",new String[]{String.valueOf(note.getId())}); 
     db.close(); 
    } 

    public String[] listNotes(){ 
     ArrayList<String> tempArray = new ArrayList<String>(); 
     String[]notesArray = new String[0]; 
     String sqlQuery = "SELECT * FROM " + TABLE_NAME; 
     SQLiteDatabase db = this.getReadableDatabase(); 
     Cursor c = db.rawQuery(sqlQuery,null); 

     if(c.moveToFirst()){ 
      do{ 
       tempArray.add(c.getString(c.getColumnIndex(NOTE_TITLE))); 
      } 
      while(c.moveToNext()); 
     } 
     c.close(); 
     notesArray = tempArray.toArray(notesArray); 
     return notesArray; 
    } 



} 

注对象：

import java.util.Calendar; 

public class Note { 

    private int id; 
    private String text; 
    private String title; 
    private String creationTime; 
    private String currentTime; 


    public Note(){ 


    } 


    public String getCurrentTime(){ 
     return getDayOfMonth()+"/"+getMonth()+"/"+getYear()+" "+getDay()+", "+getHour()+":"+getMinutes(); 
    } 

    public String getMonth(){ 
     int currentMonth = Calendar.getInstance().get(Calendar.MONTH); 
     String month = new String(); 
     switch(currentMonth){ 
     case 0: 
      month = "01"; 
      break; 
     case 1: 
      month = "02"; 
      break; 
     case 3: 
      month = "04"; 
      break; 
     case 4: 
      month = "05"; 
      break; 
     case 5: 
      month = "06"; 
      break; 
     case 6: 
      month = "07"; 
      break; 
     case 7: 
      month = "08"; 
      break; 
     case 8: 
      month = "09"; 
      break; 
     case 9: 
      month = "10"; 
      break; 
     case 10: 
      month = "11"; 
      break; 
     case 11: 
      month = "12"; 
      break; 
     } 
     return month; 
    } 

    public String getDayOfMonth(){ 
     int currentDayOfMonth = Calendar.getInstance().get(Calendar.DAY_OF_MONTH); 
     String dayOfMonth = new String(); 
     if(currentDayOfMonth<10){ 
      dayOfMonth = "0"+currentDayOfMonth; 
     } 
     else{ 
      dayOfMonth = ""+currentDayOfMonth; 
     } 
     return dayOfMonth; 
    } 

    public String getYear(){ 
     String year = ""+Calendar.getInstance().get(Calendar.YEAR); 
     return year; 
    } 

    public String getDay(){ 
     int currentDay = Calendar.getInstance().get(Calendar.DAY_OF_WEEK); 
     String day = new String(); 
     switch(currentDay){ 
     case 1: 
      day = "Sun"; 
      break; 
     case 2: 
      day = "Mon"; 
      break; 
     case 3: 
      day = "Tue"; 
      break; 
     case 4: 
      day = "Wed"; 
      break; 
     case 5: 
      day = "Thu"; 
      break; 
     case 6: 
      day = "Fri"; 
      break; 
     case 7: 
      day = "Sat"; 
      break; 

     } 
     return day; 
    } 

    public String getHour(){ 
     int currentHour = Calendar.getInstance().get(Calendar.HOUR_OF_DAY); 
     String hour = new String(); 
     if(currentHour<10){ 
      hour = "0"+currentHour; 
     } 
     else{ 
      hour = ""+currentHour; 
     } 
     return hour; 
    } 

    public String getMinutes(){ 
     int currentMinutes = Calendar.getInstance().get(Calendar.MINUTE); 
     String minutes = new String(); 
     if(currentMinutes<10){ 
      minutes = "0"+currentMinutes; 
     } 
     else{ 
      minutes = ""+currentMinutes; 
     } 
     return minutes; 
    } 


    public void setText(String text){ 
     this.text = text; 
    } 

    public String getText(){ 
     return this.text; 
    } 

    public void setTitle(String title){ 
     this.title = title; 
    } 

    public String getTitle(){ 
     return this.title; 
    } 

    public void setId(int id){ 
     this.id = id; 
    } 

    public int getId(){ 
     return this.id; 
    } 

} 

主要活动：

import android.os.Bundle; 
import android.app.Activity; 
import android.view.Menu; 
import android.widget.ArrayAdapter; 
import android.widget.ListView; 

public class MainActivity extends Activity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     DatabaseManager db = new DatabaseManager(this); 
     Note n1 = new Note(); 
     Note n2 = new Note(); 
     n1.setTitle("n1 title"); 
     n1.setText("n1 text"); 
     n2.setTitle("n2 title"); 
     n2.setText("n2 text"); 
     db.addNote(n1); 
     db.addNote(n2); 
     String[]notes = db.listNotes(); 
     ArrayAdapter<String>adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,notes); 
     ListView lv = (ListView)findViewById(R.id.notes_list); 
     lv.setAdapter(adapter); 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.activity_main, menu); 
     return true; 
    } 

}

和XML文件：

<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" 
    tools:context=".MainActivity" > 

    <ImageView 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:src="@drawable/board" 
     android:scaleType="fitXY"/> 

    <ImageButton 
     android:id="@+id/add_note" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_marginTop="10dp" 
     android:layout_alignParentRight="true" 
     android:layout_marginRight="10dp" 
     android:src="@drawable/note" 
     android:background="@android:color/transparent"/> 

    <ListView 
     android:id="@+id/notes_list" 
     android:layout_width="wrap_content" 
     android:layout_height="match_parent" 
     android:layout_alignParentTop="true"/> 

Answer 1

在查询的分号缺少您的表创建的字符串CREATE_NOTES_TABLE字符串。在紧跟最后一个“）”后面的字符串中包含一个分号（;）;即。做了 ”）;”;