的Android SQLiteOpenHelper

Question

我與

java.lang.RuntimeException: Unable to start activity ComponentInfo{...}: 
    java.lang.IllegalStateException: Couldn't read row 0, col 1 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it. 
    ... 

這裏應用程序崩潰是導致錯誤的方法：

public int getWeek(int yearAndWeek) throws CursorIndexOutOfBoundsException { 
    SQLiteDatabase db = this.getReadableDatabase(); 

    String selectQuery = "SELECT * FROM " + TABLE_WEEKS + " WHERE " 
      + KEY_WEEK + " = " + yearAndWeek; 

    Cursor c = db.rawQuery(selectQuery, null); 

    if (c.getCount() > 0) 
     c.moveToFirst(); 

    return c.getInt(c.getColumnIndex(KEY_WEEK_NUMBER)); 
} 

在此行return c.getInt(c.getColumnIndex(KEY_WEEK_NUMBER));出現的錯誤。請幫我解決這個錯誤。

Answer 1

要保持從方法的正確答覆，您可以嘗試使用以下代碼。

public int getWeek(int yearAndWeek) throws CursorIndexOutOfBoundsException { 

    SQLiteDatabase db = this.getReadableDatabase(); 
    String selectQuery = "SELECT * FROM " + TABLE_WEEKS + " WHERE " + KEY_WEEK + " = " + yearAndWeek; 
    Cursor c = db.rawQuery(selectQuery, null); 

    if (c.getCount() > 0) { 
     c.moveToFirst(); 
     return c.getInt(c.getColumnIndex(KEY_WEEK_NUMBER)); 
    } 
    return -1;   
}