Синтаксис кода SQLiteException Android 1

Question

Я сделал базу данных в приложении, код содержит синтаксис таблицы (код 1). Я прочитал почти все вопросы об этом исключении, сделал все, что было сказано. но все же это не сработает. Я не мог найти, в чем проблема. есть ли кто-нибудь, кто может мне помочь?

Мой код здесь:

public class NotesDatabaseAdapter { 

    public static final String KEY_NAME = "name"; 
    public static final String KEY_IMAGE = "icon"; 
    public static final String KEY_DATE_TIME = "when"; 
    public static final String KEY_ROWID = "_id"; 
    private static final String TAG = "NotesDatabaseAdapter"; 
    private DatabaseHelper mDbHelper; 
    private SQLiteDatabase mDatabase; 
    private static final String DATABASE_TABLE = "downloads"; 

    /** 
    * Khởi tạo Cơ sở dữ liệu 
    */ 
    private static final String DATABASE_NAME = "blogradio.db"; 
    private static final int DATABASE_VERSION = 1; 
    private static final String CREATE_DOWNLOAD_TABLE = "create table " 
      + DATABASE_TABLE + "(" + KEY_ROWID 
      + " INTEGER PRIMARY KEY AUTOINCREMENT, " + KEY_NAME 
      + " TEXT NOT NULL, " + KEY_IMAGE + " TEXT NOT NULL, " 
      + KEY_DATE_TIME + " TEXT NOT NULL);"; 

    private final Context mCtx; 

    private static class DatabaseHelper extends SQLiteOpenHelper { 

     DatabaseHelper(Context context) { 
      super(context, DATABASE_NAME, null, DATABASE_VERSION); 
     } 

     @Override 
     public void onCreate(SQLiteDatabase db) { 
      Log.i("", "abc " + CREATE_DOWNLOAD_TABLE); 
      db.execSQL(CREATE_DOWNLOAD_TABLE); 
     } 

     @Override 
     public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
      Log.w(TAG, "Upgrading database from version " + oldVersion + " to " 
        + newVersion + ", which will destroy all old data"); 
      db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE); 
      onCreate(db); 
     } 
    } 

    /** 
    * Constructor - takes the context to allow the database to be 
    * opened/created 
    * 
    * @param ctx 
    *   the Context within which to work 
    */ 
    public NotesDatabaseAdapter(Context ctx) { 
     this.mCtx = ctx; 
    } 

    /** 
    * Open the notes database. If it cannot be opened, try to create a new 
    * instance of the database. If it cannot be created, throw an exception to 
    * signal the failure 
    * 
    * @return this (self reference, allowing this to be chained in an 
    *   initialization call) 
    * @throws SQLException 
    *    if the database could be neither opened or created 
    */ 
    public NotesDatabaseAdapter open() throws SQLException { 
     mDbHelper = new DatabaseHelper(mCtx); 
     mDatabase = mDbHelper.getWritableDatabase(); 
     return this; 
    } 

    public void close() { 
     mDbHelper.close(); 
    } 

    /** 
    * Create a new note using the title and body provided. If the note is 
    * successfully created return the new rowId for that note, otherwise return 
    * a -1 to indicate failure. 
    * 
    * @param title 
    *   the title of the note 
    * @param body 
    *   the body of the note 
    * @return rowId or -1 if failed 
    */ 

    public long createNote(ItemDownload item) { 
     ContentValues initialValues = new ContentValues(); 
     initialValues.put(KEY_NAME, item.getName()); 
     initialValues.put(KEY_IMAGE, item.getIcon()); 
     initialValues.put(KEY_DATE_TIME, item.getWhen()); 
     return mDatabase.insert(DATABASE_TABLE, null, initialValues); 
    } 

    /** 
    * Delete the note with the given rowId 
    * 
    * @param rowId 
    *   id of note to delete 
    * @return true if deleted, false otherwise 
    */ 
    public boolean deleteNote(long rowId) { 
     return mDatabase.delete(DATABASE_TABLE, KEY_ROWID + "=" + rowId, null) > 0; 
    } 

    /** 
    * Return a Cursor over the list of all notes in the database 
    * 
    * @return Cursor over all notes 
    */ 
    // Lây toàn bộ các Ghi Chú để hiển thị lên Listview 
    public Cursor fetchAllNotes() { 

     return mDatabase.query(DATABASE_TABLE, new String[] { KEY_ROWID, 
       KEY_NAME, KEY_IMAGE, KEY_DATE_TIME }, null, null, null, null, 
       null); 
    } 

    /** 
    * Return a Cursor positioned at the note that matches the given rowId 
    * 
    * @param rowId 
    *   id of note to retrieve 
    * @return Cursor positioned to matching note, if found 
    * @throws SQLException 
    *    if note could not be found/retrieved 
    */ 
    public Cursor fetchNote(long rowId) throws SQLException { 

     Cursor mCursor = 

     mDatabase.query(true, DATABASE_TABLE, new String[] { KEY_ROWID, 
       KEY_NAME, KEY_IMAGE, KEY_DATE_TIME }, KEY_ROWID + "=" + rowId, 
       null, null, null, null, null); 
     if (mCursor != null) { 
      mCursor.moveToFirst(); 
     } 
     return mCursor; 

    } 

    /** 
    * Update the note using the details provided. The note to be updated is 
    * specified using the rowId, and it is altered to use the title and body 
    * values passed in 
    * 
    * @param rowId 
    *   id of note to update 
    * @param title 
    *   value to set note title to 
    * @param body 
    *   value to set note body to 
    * @return true if the note was successfully updated, false otherwise 
    */ 
    public boolean updateNote(long rowId, ItemDownload item) { 
     ContentValues args = new ContentValues(); 
     args.put(KEY_NAME, item.getName()); 
     args.put(KEY_IMAGE, item.getIcon()); 

     args.put(KEY_DATE_TIME, item.getWhen()); 

     return mDatabase.update(DATABASE_TABLE, args, KEY_ROWID + "=" + rowId, 
       null) > 0; 
    } 
} 

MainActivity:

public class RequestClass extends Activity implements OnClickListener { 
    Button start, stop, startActivity; 
    int btnStart, btnStop; 
    public static final String STATE = "start"; 
    private Intent intent; 
    NotesDatabaseAdapter db; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.request_layout); 
     db = new NotesDatabaseAdapter(RequestClass.this); 
     db.open(); 
     start = (Button) findViewById(R.id.btnStartService); 
     stop = (Button) findViewById(R.id.btnStopService); 
     startActivity = (Button) findViewById(R.id.btnStartActivity); 
     start.setOnClickListener(this); 
     stop.setOnClickListener(this); 
     startActivity.setOnClickListener(this); 

    } 

    @Override 
    public void onClick(View view) { 
     switch (view.getId()) { 
     case R.id.btnStartService: 
      intent = new Intent(this, ServiceClass.class); 
      intent.putExtra(STATE, "http://media3.nhacvietplus.com.vn/Upload/CMS/Nam_2015/Thang_5/Ngay_7/Images/blog-radio389-5.jpg"); 
//   ItemDownload item = new ItemDownload("BLOGRADIO", "xxx", "http://media3.nhacvietplus.com.vn/Upload/CMS/Nam_2015/Thang_5/Ngay_7/Images/blog-radio389-5.jpg"); 
//   db.createNote(item); 
//   db.close(); 
      startService(intent); 

      break; 
     case R.id.btnStopService: 
      stopService(intent); 
      break; 
     case R.id.btnStartActivity: 
      Intent i = new Intent(RequestClass.this, ResponseClass.class); 
      startActivity(i); 
      break; 
     } 
    } 

    @Override 
    protected void onResume() { 
     super.onResume(); 
    } 

    @Override 
    protected void onPause() { 
     super.onPause(); 
    } 

    @Override 
    protected void onDestroy() { 
     super.onDestroy(); 
    } 
} 

Logcat:

05-14 14:08:41.152: E/SQLiteLog(1979): (1) near "when": syntax error 
05-14 14:08:41.152: D/AndroidRuntime(1979): Shutting down VM 
05-14 14:08:41.152: W/dalvikvm(1979): threadid=1: thread exiting with uncaught exception (group=0xa61fe908) 
05-14 14:08:41.156: E/AndroidRuntime(1979): FATAL EXCEPTION: main 
05-14 14:08:41.156: E/AndroidRuntime(1979): java.lang.RuntimeException: Unable to start activity ComponentInfo{android.tadev.demodownloadservice/android.tadev.downloadservice.temp.RequestClass}: android.database.sqlite.SQLiteException: near "when": syntax error (code 1): , while compiling: create table downloads(_id INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT NOT NULL, icon TEXT NOT NULL, when TEXT NOT NULL); 
05-14 14:08:41.156: E/AndroidRuntime(1979):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 
05-14 14:08:41.156: E/AndroidRuntime(1979):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 
05-14 14:08:41.156: E/AndroidRuntime(1979):  at android.app.ActivityThread.access$600(ActivityThread.java:141) 
05-14 14:08:41.156: E/AndroidRuntime(1979):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 
05-14 14:08:41.156: E/AndroidRuntime(1979):  at android.os.Handler.dispatchMessage(Handler.java:99) 
05-14 14:08:41.156: E/AndroidRuntime(1979):  at android.os.Looper.loop(Looper.java:137) 
05-14 14:08:41.156: E/AndroidRuntime(1979):  at android.app.ActivityThread.main(ActivityThread.java:5041) 
05-14 14:08:41.156: E/AndroidRuntime(1979):  at java.lang.reflect.Method.invokeNative(Native Method) 
05-14 14:08:41.156: E/AndroidRuntime(1979):  at java.lang.reflect.Method.invoke(Method.java:511) 
05-14 14:08:41.156: E/AndroidRuntime(1979):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
05-14 14:08:41.156: E/AndroidRuntime(1979):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
05-14 14:08:41.156: E/AndroidRuntime(1979):  at dalvik.system.NativeStart.main(Native Method) 
05-14 14:08:41.156: E/AndroidRuntime(1979): Caused by: android.database.sqlite.SQLiteException: near "when": syntax error (code 1): , while compiling: create table downloads(_id INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT NOT NULL, icon TEXT NOT NULL, when TEXT NOT NULL); 
05-14 14:08:41.156: E/AndroidRuntime(1979):  at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method) 
05-14 14:08:41.156: E/AndroidRuntime(1979):  at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:882) 
05-14 14:08:41.156: E/AndroidRuntime(1979):  at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:493) 
05-14 14:08:41.156: E/AndroidRuntime(1979):  at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588) 
05-14 14:08:41.156: E/AndroidRuntime(1979):  at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58) 
05-14 14:08:41.156: E/AndroidRuntime(1979):  at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31) 
05-14 14:08:41.156: E/AndroidRuntime(1979):  at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1663) 
05-14 14:08:41.156: E/AndroidRuntime(1979):  at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1594) 
05-14 14:08:41.156: E/AndroidRuntime(1979):  at android.tadev.downloadservice.temp.NotesDatabaseAdapter$DatabaseHelper.onCreate(NotesDatabaseAdapter.java:44) 
05-14 14:08:41.156: E/AndroidRuntime(1979):  at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:252) 
05-14 14:08:41.156: E/AndroidRuntime(1979):  at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:164) 
05-14 14:08:41.156: E/AndroidRuntime(1979):  at android.tadev.downloadservice.temp.NotesDatabaseAdapter.open(NotesDatabaseAdapter.java:79) 
05-14 14:08:41.156: E/AndroidRuntime(1979):  at android.tadev.downloadservice.temp.RequestClass.onCreate(RequestClass.java:23) 
05-14 14:08:41.156: E/AndroidRuntime(1979):  at android.app.Activity.performCreate(Activity.java:5104) 
05-14 14:08:41.156: E/AndroidRuntime(1979):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 
05-14 14:08:41.156: E/AndroidRuntime(1979):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 
05-14 14:08:41.156: E/AndroidRuntime(1979):  ... 11 more 

Answer 1

Вы не можете назвать столбец "КОГДА", так как это ключевое слово в sqlite

Answer 2

'when' - ключевое слово sqlite.

public static final String KEY_DATE_TIME = "when"; 

Изменить это следующим образом: -

public static final String KEY_DATE_TIME = "date_and_time";