java - 如何在android studio中使用sqlite获得多个外键的良好语法

Question

我尝试使用 android studio 将 2 个外键放入 sqlite，但出现以下错误:

多个外键错误

然而，当我只获得 1 个外键时，它对我有用，如下所示:

   @Override
public void onCreate(SQLiteDatabase db) {
    String TABLE_CREATE = "CREATE TABLE " + TABLE_NAME + " ("
            + RENDEZ_VOUS_ID  + " INTEGER PRIMARY KEY AUTOINCREMENT, "
            + DATE + " DATE, "
            + TIME + " TIME, "
            + STATUS + " INTEGER, "
            + COMMENT + " TEXT, "
            + CONTACT_ID + " INTEGER, FOREIGN KEY("+CONTACT_ID+") REFERENCES "+DatabaseManagerContact.TABLE_NAME+"("+CONTACT_ID+"));";

    db.execSQL(TABLE_CREATE);
    Log.i("DATABASE Rendez Vous", "onCreate invoked ");
}

你知道问题出在哪里吗？

问候

Answer 1

在语句末尾声明所有外键，如下所示:

String TABLE_CREATE = "CREATE TABLE " + TABLE_NAME + " ("
        + RENDEZ_VOUS_ID  + " INTEGER PRIMARY KEY AUTOINCREMENT, "
        + DATE + " DATE, "
        + TIME + " TIME, "
        + STATUS + " INTEGER, "
        + COMMENT + " TEXT, "
        + CONTACT_ID + " INTEGER, "
        + OTHER_ID +  " INTEGER, "
        + FOREIGN KEY("+CONTACT_ID+") REFERENCES "+DatabaseManagerContact.TABLE_NAME+"("+CONTACT_ID+"), "
        + FOREIGN KEY("+OTHER_ID+") REFERENCES "+DatabaseManagerContact.ANOTHER_TABLE_NAME+"("+ANOTHER_ID+"));";