當選擇光標SQL得到強制關閉

這是我的方法的高分當選擇光標SQL得到強制關閉

public void highscore(){ 

     Cursor gethighscorealter = highscoreDB.rawQuery("SELECT MIN(TIME) FROM HIGHSCORE3;" 
        , null); 
     gethighscorealter.moveToFirst(); 
     if(gethighscorealter!=null){ 
      timer= gethighscorealter.getInt(gethighscorealter.getColumnIndex("TIME")); 
      move = gethighscorealter.getInt(gethighscorealter.getColumnIndex("MOVE")); 
      grid = gethighscorealter.getInt(gethighscorealter.getColumnIndex("GRID")); 
      highscoreview(); 
     } 
    }

這是我的日誌貓

06-02 13:30:38.599: E/AndroidRuntime(32416): FATAL EXCEPTION: main 
06-02 13:30:38.599: E/AndroidRuntime(32416): java.lang.IllegalStateException: Couldn't read row 0, col -1 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it. 
06-02 13:30:38.599: E/AndroidRuntime(32416): at android.database.CursorWindow.nativeGetLong(Native Method) 
06-02 13:30:38.599: E/AndroidRuntime(32416): at android.database.CursorWindow.getLong(CursorWindow.java:507) 
06-02 13:30:38.599: E/AndroidRuntime(32416): at android.database.CursorWindow.getInt(CursorWindow.java:574) 
06-02 13:30:38.599: E/AndroidRuntime(32416): at android.database.AbstractWindowedCursor.getInt(AbstractWindowedCursor.java:69) 
06-02 13:30:38.599: E/AndroidRuntime(32416): at skripsi.slidame.PuzzleActivity.highscore(PuzzleActivity.java:253) 
06-02 13:30:38.599: E/AndroidRuntime(32416): at skripsi.slidame.PuzzleActivity.onOptionsItemSelected(PuzzleActivity.java:131)

他們說行0山坳 - 1 ??我無法理解

來源

2013-06-02 user2375628

您收到此錯誤的原因是你的查詢只返回TIME列。你必須修改你的查詢來說SELECT MIN(TIME), MOVE, GRID FROM HIGHSCORE3;返回你正在尋找的所有列。

希望這會有所幫助。 :)

來源

2013-06-02 07:19:49 kushyar

thx我知道了，當我在w3schools.com上測試時，我看到只有1列被選中，所以即時通過ASC使用順序，我得到了該表中的最小值，但現在我正在考慮獲得最小值2列參數'TIME'和'MOVE' – user2375628

我明白了，'select min（time），min（move）from highscore3' 但是，我不能像往常一樣調用name列，必須'getnameindex（0）';當我看到在w3school.com列名更改爲'expr1000' – user2375628

請更改表格中列time的名稱，然後檢索數據。因爲這是已存儲在database schema內部的密鑰。請更改列的名稱並再次檢查一切。我希望它能正常工作。

來源

2013-06-02 06:49:18

我厚光標沒有得到計數，然後拋出異常，

Cursor gethighscorealter = highscoreDB.rawQuery("SELECT MIN(TIME) FROM HIGHSCORE3;" 
       , null); 

    if(gethighscorealter.getCount() > 0){ 
     gethighscorealter.moveToFirst(); 
     timer= gethighscorealter.getInt(gethighscorealter.getColumnIndex("TIME")); 
     move = gethighscorealter.getInt(gethighscorealter.getColumnIndex("MOVE")); 
     grid = gethighscorealter.getInt(gethighscorealter.getColumnIndex("GRID")); 
     highscoreview(); 
     gethighscorealter.close(); 

    }

來源

2013-06-02 06:50:01

當選擇光標SQL得到強制關閉

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