SQLite的自动递增不工作

问题描述：

确定这是不是垃圾邮件，它应该是简单的，我不知道为什么它不工作
这是我的code：

ok this isn't spamming and it's supposed to be simple I don't know why it's not working this is my code:

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();
}

这有什么错呢？所有记录的日志显示0

what's wrong with this ? the log displays 0 for all records

答

SQLite的表的主键被称为_id。它是自动递增，你不应该试图插入值到它。

The primary key for SQLite tables is called _id. It is auto incrementing, and you should not be trying to insert values into it.

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();
}

SQLite的自动递增不工作

相关推荐