Android Sqlite外键Unknwon列

我在数据库中添加了外键。我从我的设备重新安装了应用程序并增加了数据库版本。这里是我的代码：Android Sqlite外键Unknwon列

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

创建表：

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); 
    }

未知列 “孩子” 外键的定义（代码1）：在编译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，名称TEXT，erstelldatum LONG，截止期限LONG，完成INTEGER，值FLOAT，fortschritt FLOAT）;

激活外键：

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

编辑：还没工作

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 " + ");";

来源

2016-08-21 XxGoliathusxX

你CREATE TABLE为TABLE_ZIELE有两种问题：

实际上你需要指定您使用的外部列键，例如cid INTEGER。
诸如FOREIGN KEY之类的限制条件列在色谱柱规格部分之后。最后移动它们。

来源

2016-08-21 20:15:46 laalto

第一个是错误的，因为它的外键。而第二个没有帮助 – XxGoliathusxX

你需要他们两个。表约束不声明列，并且不能在列规范之间混合表约束。 – laalto

看编辑 – XxGoliathusxX

您必须实施FOREIGN KEY作为表或列约束。在您选择的第一种情况下，您需要引用您之前定义的列。

在documentation你找到了一些正确的做法。

在你的情况下，你需要使用列约束，而不是像你打算做的那样。

您只需更换线，如

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

与

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

来源

2016-08-21 20:21:30 tynn

我不明白。为什么我应该删除那个FOREIGN KEY（...）？ – XxGoliathusxX

因为这就是你如何定义一个引用外部表的列。 'FOREIGN KEY'仅用于表约束 – tynn

Android Sqlite外键Unknwon列

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