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你好我很新的android开发。 我目前有两张桌子,需要加入这些桌子才能进行PK/FK比赛吗?你需要连接表在android sqlite中有一个forign键/主键匹配吗?
我试图按照这样的设计:绿色= PK,橙= FK
目前,我有这个代码,但我不认为它的权利。
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);
}
任何帮助将是巨大的 感谢
我知道,但我想有一个与这些表fk/pk匹配,所以我可以查询他们 –
谢谢!但我有没有这样做过? –
我认为你需要首先创建TEAM_TABLE,因为你正在引用它的主键。 –