SQLite自动增量不起作用

Question

好吧,这不是垃圾邮件,它应该是简单的我不知道为什么它不工作这是我的代码:

gamesdatabase = openOrCreateDatabase("GamesDatabase", MODE_PRIVATE, null);
gamesdatabase.execSQL("CREATE TABLE IF NOT EXISTS Games (ID INTEGER PRIMARY KEY, Name
VARACHAR, NPlayers INT(1), NRounds INT(2), WinScore INT(2));");

gamesdatabase.execSQL("INSERT INTO Games 
(ID, Name, NPlayers, NRounds, WinScore ) VALUES ( NULL, 'TAWLA',2,0,0 );");

gamesdatabase.execSQL("INSERT INTO Games 
(ID, Name, NPlayers, NRounds, WinScore ) VALUES ( NULL, 'DOMANA',4,0,0 );");


Cursor c = gamesdatabase.rawQuery("SELECT * FROM Games", null);
c.moveToFirst();
while (c.isAfterLast() == false) {
Log.d("BEZRA", String.valueOf(c.getInt(c.getColumnIndex("ID"))));
c.moveToNext();
}

这有什么问题？所有记录的日志显示为0

Answer 1

SQLite表的主键称为_id.它是自动递增的,您不应该尝试在其中插入值.

gamesdatabase = openOrCreateDatabase("GamesDatabase", MODE_PRIVATE, null);
gamesdatabase.execSQL("CREATE TABLE IF NOT EXISTS Games (_id INTEGER PRIMARY KEY, Name
VARACHAR, NPlayers INT(1), NRounds INT(2), WinScore INT(2));");

gamesdatabase.execSQL("INSERT INTO Games 
(Name, NPlayers, NRounds, WinScore ) VALUES ('TAWLA',2,0,0 );");

gamesdatabase.execSQL("INSERT INTO Games 
(Name, NPlayers, NRounds, WinScore ) VALUES ('DOMANA',4,0,0 );");


Cursor c = gamesdatabase.rawQuery("SELECT * FROM Games", null);
c.moveToFirst();
while (c.isAfterLast() == false) {
Log.d("BEZRA", String.valueOf(c.getInt(c.getColumnIndex("_id"))));
c.moveToNext();
}

Answer 2

对我有用的是将我的创建类型从INT重命名为INTEGER并开始工作.

由此:

CREATE TABLE IF NOT EXISTS foo (id INT PRIMARY KEY, bar INT)

对此:

CREATE TABLE IF NOT EXISTS foo (id INTEGER PRIMARY KEY, bar INT)

Answer 3

你可以看到 http://alvinalexander.com/android/sqlite-autoincrement-serial-identity-primary-key 示例 CRETAE_TABLE

  CREATE TABLE salespeople (
  id INTEGER PRIMARY KEY,
  first_name TEXT NOT NULL,
  last_name TEXT NOT NULL,
  commission_rate REAL NOT NULL
);

插入数据

 INSERT INTO salespeople VALUES (null, 'Fred', 'Flinstone', 10.0);

- -或者 - -

INSERT INTO salespeople (first_name, last_name, commission_rate) VALUES ('Fred', 'Flinstone', 10.0);