我怎样才能减少SQLite表的int列

Question

我的数据库中有一个表有三列:Screen,Icon和Rank:我试图找到最简洁的方法来实现以下功能.

我想找到所有行WHERE Screen ="myScreen"和Rank> 5 //然后使排名低于当前值...我在Java中通过SQLite Manager类在以下函数中执行此操作:

public void DeleteScreenIcon (int id, String screenName, int rank){
        int screenID = getScreenID(screenName);
        SQLiteDatabase db=this.getWritableDatabase();
        db.delete(isLookUp, colScreenID + "=" + screenID + " and " +colIconID+ "="+id, null);
        // HERE IS WHERE I NOW WANT TO DO THAT..
        db.execSQL("update "+ isLookUp +" set "+colRank+ "=" +colRank+ " -1 "+" where " + colScreenID +  "='"  +screenName + "' and " + colRank +">" +rank);
        db.close();
    }

对不起,我不熟悉SQL任何帮助表示赞赏

Answer 1

此更新应该可以解决问题:

UPDATE myTable 
SET Rank = Rank - 1
WHERE Screen = "myScreen"
AND Rank > 5;