Android。 SQLite的例外：没有这样的列_ingredients

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林有一些麻烦，试图获取存储在我的数据库中的信息，并显示它在ListView。当我启动应用程序时，它崩溃。Android。 SQLite的例外：没有这样的列_ingredients

我的MainActivity：

private ListViewAdapter adapter; 
private ArrayList<ListItem> itemList; 
private ListView list; 
private DatabaseAdapter receptDB; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_list); 
    setupButton(); 
    setupListView(); 
    setupDatabase(); 
    addObject(); 


} 

private void setupDatabase() { 
    receptDB = new DatabaseAdapter(this); 
    receptDB.open(); 
    refreshListView(); 
} 


private void setupButton() { 
    Button addItemButton = (Button) findViewById(R.id.addItemButton); 
    addItemButton.setOnClickListener(new View.OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      buttonClicked(); 
     } 
    }); 
} 

private void buttonClicked() { 
    //get EditText 
    Intent newItemIntent = new Intent(List_Page.this, Add_Object.class); 
    startActivity(newItemIntent); 
    finish(); 
} 

private void setupListView() { 
    itemList = new ArrayList<ListItem>(); 
    adapter = new ListViewAdapter(List_Page.this, itemList); 
    list = (ListView) findViewById(R.id.listItem); 
    list.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() { 
     @Override 
     public boolean onItemLongClick(AdapterView<?> parent, View view, 
             int position, long id) { 
      return true; 
     } 
    }); 
    View header = ((LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE)).inflate(R.layout.activity_list_item, null); 
    list.addHeaderView(header); 
    list.setAdapter(adapter); 

} 

private void addObject(){ 
    Intent intent = getIntent(); 
    if (intent.hasExtra(Constants.KEY_RECEPT_NAME)) { 
     String name = intent.getExtras().getString(Constants.KEY_RECEPT_NAME); 
     String kategory = intent.getExtras().getString(Constants.KEY_KATEGORY); 
     String ingredients = intent.getExtras().getString(Constants.KEY_INGREDIENTS); 
     String directions = intent.getExtras().getString(Constants.KEY_DIRECTIONS); 
     Bitmap image = (Bitmap) intent.getParcelableExtra(Constants.KEY_IMAGE); 
     //byte[] imageBytes = getBytes(image); 
     ListItem newObject = new ListItem(name,kategory,ingredients,directions, image); 
     //itemList.add(newObject); 
     receptDB.insertReceptItem(newObject); 
     refreshListView(); 
    } 
} 
    private void refreshListView() { 
    Cursor cursor = receptDB.getAllRows(); 
    String[] fromFieldNames = new String[] {DatabaseAdapter.KEY_NAME, DatabaseAdapter.KEY_KATEGORY}; 
    int[] toViewIDs = new int[] {R.id.receptName, R.id.kategory}; 
    SimpleCursorAdapter myCursorAdapter; 
    myCursorAdapter = new SimpleCursorAdapter(getBaseContext(), R.layout.activity_list_item, cursor, fromFieldNames, toViewIDs, 0); 
    ListView myList = (ListView) findViewById(R.id.listItem); 
    myList.setAdapter(myCursorAdapter); 
} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 

    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.main, menu); 
    return true; 
} 

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

数据库：

公共类DatabaseAdapter {

private static final String TAG = "DBAdapter"; 
private static final String DATABASE_NAME = "receptlist.db"; 
private static final int DATABASE_VERSION = 2; 

private static final String DATABASE_TABLE = "receptlistitems"; 

public static final String KEY_ID = "_id"; 
public static final String KEY_NAME = "name"; 
public static final String KEY_KATEGORY = "kategory"; 
public static final String KEY_INGREDIENTS = "ingredients"; 
public static final String KEY_DIRECTIONS = "directions"; 
//bitmap? 

public static final int COLUMN_NAME_INDEX = 1; 
public static final int COLUMN_KATEGORY_INDEX = 2; 
public static final int COLUMN_INGREDIENTS_INDEX = 3; 
public static final int COLUMN_DIRECTIONS_INDEX = 4; 

public static final String[] ALL_KEYS = new String[] {KEY_ID, KEY_NAME, KEY_KATEGORY, KEY_INGREDIENTS, KEY_DIRECTIONS}; 

private static final String DATABASE_CREATE = "create table " 
     + DATABASE_TABLE + " (" + KEY_ID 
     + " integer primary key autoincrement, " + KEY_NAME 
     + " text not null, " + KEY_KATEGORY 
     + " text, " + KEY_INGREDIENTS 
     + " text not null, " + KEY_DIRECTIONS 
     + " text not null);"; 

private final Context context; 
private DatabaseHelper DBHelper; 
private SQLiteDatabase db; 

public DatabaseAdapter(Context context) { 
    this.context = context; 
    DBHelper = new DatabaseHelper(context); 
} 

public DatabaseAdapter open(){ 
    db = DBHelper.getWritableDatabase(); 
    return this; 
} 

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

//Neue Liste von Daten in Datenbank 
public long insertReceptItem(ListItem item) { 
    ContentValues itemValues = new ContentValues(); 
    itemValues.put(KEY_NAME, item.getName()); 
    itemValues.put(KEY_KATEGORY,item.getKategory()); 
    itemValues.put(KEY_INGREDIENTS, item.getIngredients()); 
    itemValues.put(KEY_DIRECTIONS, item.getDirection()); 

    //Speichern in die Datenbank 
    return db.insert(DATABASE_TABLE, null, itemValues); 
} 

//Löschen eines Items durch den primary Key 
public boolean deleteItem(long itemID){ 
    String where = KEY_ID + "=" + itemID; 
    return db.delete(DATABASE_TABLE, where, null) != 0; 
} 

public void deleteAll() { 
    Cursor c = getAllRows(); 
    long rowId = c.getColumnIndexOrThrow(KEY_ID); 
    if (c.moveToFirst()) { 
     do { 
      deleteItem(c.getLong((int) rowId)); 
     } while (c.moveToNext()); 
    } 
    c.close(); 
} 

//Zurückgeben aller Daten in der Datenbank 
public Cursor getAllRows(){ 
    String where = null; 
    Cursor c = db.query(true, DATABASE_TABLE, ALL_KEYS, where, null,null,null,null,null); 
    if (c != null) c.moveToFirst(); 
    return c; 
} 

//Auf bestimmte Reihe zugreifen 
public Cursor getRow(long rowId){ 
    String where = KEY_ID + "=" + rowId; 
    Cursor c = db.query(true, DATABASE_TABLE, ALL_KEYS, where, null,null,null,null,null); 
    if (c != null) c.moveToFirst(); 
    return c; 
} 

private static class DatabaseHelper extends SQLiteOpenHelper{ 

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

    @Override 
    public void onCreate(SQLiteDatabase db) { 
     db.execSQL(DATABASE_CREATE); 
    } 

    @Override 
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 

    } 

}

的logcat：

08-12 16:41:11.161 20386-20386/de.ur.mi.android.excercises.starter E/SQLiteLog: (1) no such column: ingredients 
08-12 16:41:11.163 20386-20386/de.ur.mi.android.excercises.starter D/AndroidRuntime: Shutting down VM 
08-12 16:41:11.164 20386-20386/de.ur.mi.android.excercises.starter E/AndroidRuntime: FATAL EXCEPTION: main 
                        Process: de.ur.mi.android.excercises.starter, PID: 20386 
                        java.lang.RuntimeException: Unable to start activity ComponentInfo{de.ur.mi.android.excercises.starter/de.ur.mi.android.excercises.starter.List_Page}: android.database.sqlite.SQLiteException: no such column: ingredients (code 1): , while compiling: SELECT DISTINCT _id, name, kategory, ingredients, directions FROM receptlistitems 
                         at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2720) 
                         at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2781) 
                         at android.app.ActivityThread.-wrap12(ActivityThread.java) 
                         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1508) 
                         at android.os.Handler.dispatchMessage(Handler.java:102) 
                         at android.os.Looper.loop(Looper.java:241) 
                         at android.app.ActivityThread.main(ActivityThread.java:6274) 
                         at java.lang.reflect.Method.invoke(Native Method) 
                         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) 
                         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776) 
                         Caused by: android.database.sqlite.SQLiteException: no such column: ingredients (code 1): , while compiling: SELECT DISTINCT _id, name, kategory, ingredients, directions FROM receptlistitems 
                         at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method) 
                         at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:895) 
                         at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:506) 
                         at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588) 
                         at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58) 
                         at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37) 
                         at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44) 
                         at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1318) 
                         at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1165) 
                         at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1036) 
                         at de.ur.mi.android.excercises.starter.DatabaseAdapter.getAllRows(DatabaseAdapter.java:96) 
                         at de.ur.mi.android.excercises.starter.List_Page.refreshListView(List_Page.java:109) 
                         at de.ur.mi.android.excercises.starter.List_Page.setupDatabase(List_Page.java:51) 
                         at de.ur.mi.android.excercises.starter.List_Page.onCreate(List_Page.java:42) 
                         at android.app.Activity.performCreate(Activity.java:6720) 
                         at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119) 
                         at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2673) 
                         at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2781)  
                         at android.app.ActivityThread.-wrap12(ActivityThread.java)  
                         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1508)  
                         at android.os.Handler.dispatchMessage(Handler.java:102)  
                         at android.os.Looper.loop(Looper.java:241)  
                         at android.app.ActivityThread.main(ActivityThread.java:6274)  
                         at java.lang.reflect.Method.invoke(Native Method)  
                         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)  
                         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)

提前感谢！

来源

2017-08-12 Alexander strejtschek

您是否在第一次安装应用程序后在模式中添加了“成分”这一列？ – Bob

我不确定。如果情况并非如此，我该怎么办？ –

如果更改数据库中的任何内容（如添加列），则必须增加“SQLiteOpenHelper”中的数据库版本并处理onUpgrade（）中的更改。或者简单的解决方案是卸载并重新安装应用程序。 – Bob

如果更改数据库模式中的任何内容（如添加列），则必须增加SQLiteOpenHelper中的数据库版本。如果你增加版本的价值，你会得到回调到onUpgrade，你必须在那里处理数据库的变化。

private static class DatabaseHelper extends SQLiteOpenHelper{ 

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

    @Override 
    public void onCreate(SQLiteDatabase db) { 
     db.execSQL(DATABASE_CREATE); 
    } 

    @Override 
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
     // Either add the column, or drop and create the table again. 
    } 

}

或简单的解决方案是卸载并重新安装应用程序。

来源

2017-08-12 15:27:03 Bob

Android。 SQLite的例外：没有这样的列_ingredients

回答

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