0
你好我很新的android開發。 我目前有兩張桌子,需要加入這些桌子才能進行PK/FK比賽嗎?你需要連接表在android sqlite中有一個forign鍵/主鍵匹配嗎?
我試圖按照這樣的設計:綠色= PK,橙= FK
目前,我有這個代碼,但我不認爲它的權利。
public void onCreate(SQLiteDatabase db) {
// SQL statement to create book table
String CREATE_PLAYER_TABLE = "CREATE TABLE " + TABLE_PLAYER_INFO + "("
+ KEY_PLAYER_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
+ KEY_FNAME + " TEXT,"
+ KEY_LNAME + " TEXT,"
+ KEY_POSITION + " TEXT,"
+ KEY_HEIGHT + " TEXT,"
+ KEY_AGE + " TEXT,"
+ KEY_WEIGHT + " TEXT,"
+ KEY_TEAM + " TEXT,"
+ FORIGN_KEY + " TEXT,"
+ " FOREIGN KEY ("+FORIGN_KEY+") REFERENCES " + TABLE_TEAM_INFO + " ("+KEY_TEAM_ID+"))";
String CREATE_TEAM_TABLE = "CREATE TABLE " + TABLE_TEAM_INFO + "("
+ KEY_TEAM_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
+ KEY_TEAMNAME + " TEXT" + ")";
// create books table
db.execSQL(CREATE_PLAYER_TABLE);
db.execSQL(CREATE_TEAM_TABLE);
}
任何幫助將是巨大的 感謝
我知道,但我想有一個與這些表fk/pk匹配,所以我可以查詢他們 –
謝謝!但我有沒有這樣做過? –
我認爲你需要首先創建TEAM_TABLE,因爲你正在引用它的主鍵。 –