無法在sqlite中使用外鍵創建表

如果運行時，我的應用程序保持代碼行db.execSQL(createOrderTable);和db.execSQL(createOrderDetail);（它們使用外鍵創建兩個表），請刪除應用程序運行OK。無法在sqlite中使用外鍵創建表

這是我對onCreate()方法：

String createUserTable = "create table " + USER_TABLE + 
      "(userID INTEGER PRIMARY KEY AUTOINCREMENT," + 
      "userName TEXT NOT NULL," + 
      "phoneNumber INTEGER);"; 
    String createProductTable = "create table " + PRODUCT_TABLE + 
      "(productID INTEGER PRIMARY KEY AUTOINCREMENT," + 
      "department TEXT,"+ 
      "name TEXT," + 
      "price REAL," + 
      "status NUMERIC);"; 
    String createOrderTable = "create table " + ORDER_TABLE + 
      "(orderID INTEGER PRIMARY KEY AUTOINCREMENT," + 
      "FOREIGN KEY(userID) REFERENCES User(userID)," + 
      "FOREIGN KEY(productID) REFERENCES Product(productID));"; 
    String createOrderDetail = "create table " + ORDER_DETAIL_TABLE + 
      "(FOREIGN KEY(orderID) REFERENCES Order(orderID)," + 
      "customerName TEXT," + 
      "address TEXT," + 
      "totalPrice REAL," + 
      "quantity INTEGER);"; 
    db.execSQL(createUserTable); 
    db.execSQL(createProductTable); 
    db.execSQL(createOrderTable); 
    db.execSQL(createOrderDetail);

這是我爲onUpgrade()：

db.execSQL("DROP TABLE IF EXISTS " + USER_TABLE); 
    db.execSQL("DROP TABLE IF EXISTS " + PRODUCT_TABLE); 
    db.execSQL("DROP TABLE IF EXISTS " + ORDER_TABLE); 
    db.execSQL("DROP TABLE IF EXISTS " + ORDER_DETAIL_TABLE); 
    onCreate(db);

如何我現在可以創建其他兩個表？任何人都可以幫忙感謝！

來源

2015-06-21 Du Tran

是否有錯誤訊息？ –

'AdbCommandRejectedException獲取設備模擬器-5554的屬性：設備脫機'我得到這個，但我不知道它是否與數據庫相關聯 –

您沒有在createOrderTable查詢中創建列userId和productId，但試圖創建外鍵引用。首先創建一個列，然後引用它。

如：

String createOrderTable = "create table " + ORDER_TABLE + 
     "(orderID INTEGER PRIMARY KEY AUTOINCREMENT," + 
     "userID INTEGER,"+ 
     "productID INTEGER,"+ 
     "FOREIGN KEY(userID) REFERENCES User(userID)," + 
     "FOREIGN KEY(productID) REFERENCES Product(productID));"; 
String createOrderDetail = "create table " + ORDER_DETAIL_TABLE + 
     "(orderID INTEGER,"+ 
     "customerName TEXT," + 
     "address TEXT," + 
     "totalPrice REAL," + 
     "quantity INTEGER," + 
     "FOREIGN KEY(orderID) REFERENCES Order(orderID));";

來源

2015-06-21 06:28:24

它仍然在創建訂單表查詢時出現語法錯誤。我嘗試使用db.execSQL（「PRAGMA foreign_keys = ON;」）啓用外鍵支持;'但沒有結果 –

你必須定義你的用戶ID和ProductID列，然後設置就可以了外鍵。

String createOrderTable = "create table " + ORDER_TABLE + 
     "(orderID INTEGER PRIMARY KEY AUTOINCREMENT," + 
     " userID integer," + 
     "FOREIGN KEY(userID) REFERENCES User(userID)," + 
     "productID integer" 
     "FOREIGN KEY(productID) REFERENCES Product(productID));";

來源

2015-06-21 06:29:36 sajjan

無法在sqlite中使用外鍵創建表

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