Android Sqlite外鍵Unknwon列

我在數據庫中添加了外鍵。我從我的設備重新安裝了應用程序並增加了數據庫版本。這裏是我的代碼：Android Sqlite外鍵Unknwon列

恆：private static final String COLUMN_K_ID = "kid";

創建表：

private static final String CREATE_TABLE_ZIELE_KOERPER = "CREATE TABLE " + TABLE_ZIELE_KOERPER + "(" + 
      COLUMN_ID   + " INTEGER PRIMARY KEY AUTOINCREMENT, " + 
      COLUMN_OPTION  + " INTEGER, " + 
      COLUMN_TENDENZ  + " INTEGER);"; 

    private static final String CREATE_TABLE_ZIELE_CARDIO = "CREATE TABLE " + TABLE_ZIELE_CARDIO + "(" + 
      COLUMN_ID   + " INTEGER PRIMARY KEY AUTOINCREMENT, " + 
      COLUMN_EXTRA  + " TEXT);"; 

    private static final String CREATE_TABLE_ZIELE_TRAINING = "CREATE TABLE " + TABLE_ZIELE_TRAINING + "(" + 
      COLUMN_ID   + " INTEGER PRIMARY KEY AUTOINCREMENT, " + 
      COLUMN_EXTRA  + " TEXT, "  + 
      COLUMN_MUSKEL  + " TEXT, "  + 
      COLUMN_WIEDERHOLUNGEN + " INTEGER)"; 

    private static final String CREATE_TABLE_ZIELE = "CREATE TABLE " + TABLE_ZIELE + "(" + 
      COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + 
      "FOREIGN KEY(" + COLUMN_K_ID + ") REFERENCES " + TABLE_ZIELE_KOERPER  + "(" + COLUMN_ID + ") ON DELETE CASCADE, " + 
      "FOREIGN KEY(" + COLUMN_C_ID + ") REFERENCES " + TABLE_ZIELE_CARDIO  + "(" + COLUMN_ID + ") ON DELETE CASCADE, " + 
      "FOREIGN KEY(" + COLUMN_T_ID + ") REFERENCES " + TABLE_ZIELE_TRAINING  + "(" + COLUMN_ID + ") ON DELETE CASCADE, " + 
      COLUMN_NAME   + " TEXT, "  + 
      COLUMN_ERSTELLDATUM + " LONG, "  + 
      COLUMN_DEADLINE  + " LONG, "  + 
      COLUMN_DONE   + " INTEGER, " + 
      COLUMN_VALUE  + " FLOAT, "  + 
      COLUMN_FORTSCHRITT + " FLOAT "  + 
      ");"; 

@Override 
    public void onCreate(SQLiteDatabase db) { 
     db.execSQL(CREATE_TABLE_ZIELE_KOERPER); 
     db.execSQL(CREATE_TABLE_ZIELE_CARDIO); 
     db.execSQL(CREATE_TABLE_ZIELE_TRAINING); 
     db.execSQL(CREATE_TABLE_ZIELE); 
    }

登錄：

未知列「孩子」外鍵的定義（代碼1）：在編譯CREATE TABLE ziele（id INTEGER PRIMARY KEY AUTOINCREMENT，FOREIGN KEY（kid）REFERENCES koerperziele（id）ON DELETE CASCADE，FOREIGN KEY（cid）REFERENCES cardioziele（id）ON DELETE CASCADE，FOREIGN KEY（t_id）REFERENCES trainingsziele（id）ONDELETE CASCADE，名稱TEXT，erstelldatum LONG，截止期限LONG，完成INTEGER，值FLOAT，fortschritt FLOAT）;

激活外鍵：

@Override 
    public void onOpen(SQLiteDatabase db) { 
     super.onOpen(db); 
     db.execSQL("PRAGMA foreign_keys=ON"); 
    }

編輯：還沒工作

private static final String CREATE_TABLE_ZIELE = "CREATE TABLE " + TABLE_ZIELE + "(" + 
      COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + 
      COLUMN_NAME   + " TEXT, "  + 
      COLUMN_ERSTELLDATUM + " LONG, "  + 
      COLUMN_DEADLINE  + " LONG, "  + 
      COLUMN_DONE   + " INTEGER, " + 
      COLUMN_VALUE  + " FLOAT, "  + 
      COLUMN_FORTSCHRITT + " FLOAT, "  + 
      "FOREIGN KEY(" + COLUMN_K_ID + " INTEGER) REFERENCES " + TABLE_ZIELE_KOERPER  + "(" + COLUMN_ID + ") ON DELETE CASCADE, " + 
      "FOREIGN KEY(" + COLUMN_C_ID + " INTEGER) REFERENCES " + TABLE_ZIELE_CARDIO  + "(" + COLUMN_ID + ") ON DELETE CASCADE, " + 
      "FOREIGN KEY(" + COLUMN_T_ID + " INTEGER) REFERENCES " + TABLE_ZIELE_TRAINING  + "(" + COLUMN_ID + ") ON DELETE CASCADE " + ");";

來源

2016-08-21 XxGoliathusxX

你CREATE TABLE爲TABLE_ZIELE有兩種問題：

實際上你需要指定您使用的外部列鍵，例如cid INTEGER。
諸如FOREIGN KEY之類的限制條件列在色譜柱規格部分之後。最後移動它們。

來源

2016-08-21 20:15:46 laalto

第一個是錯誤的，因爲它的外鍵。而第二個沒有幫助 – XxGoliathusxX

你需要他們兩個。表約束不聲明列，並且不能在列規範之間混合表約束。 – laalto

看編輯 – XxGoliathusxX

您必須實施FOREIGN KEY作爲表或列約束。在您選擇的第一種情況下，您需要引用您之前定義的列。

在documentation你找到了一些正確的做法。

在你的情況下，你需要使用列約束，而不是像你打算做的那樣。

您只需更換線，如

"FOREIGN KEY(" + COLUMN_K_ID + ") REFERENCES " + TABLE_ZIELE_KOERPER + "(" + COLUMN_ID + ") ON DELETE CASCADE, " +

與

COLUMN_K_ID + " REFERENCES " + TABLE_ZIELE_KOERPER + "(" + COLUMN_ID + ") ON DELETE CASCADE, " +

來源

2016-08-21 20:21:30 tynn

我不明白。爲什麼我應該刪除那個FOREIGN KEY（...）？ – XxGoliathusxX

因爲這就是你如何定義一個引用外部表的列。 'FOREIGN KEY'僅用於表約束 – tynn

Android Sqlite外鍵Unknwon列

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