相关疑难解决方法(0)

在我的DBHelper的getEvents方法中有这行代码.

    int year, month, day;
    String[] columns = new String[] { KEY_EVENTNAME, KEY_DESCRIPTION,
            KEY_HOUR, KEY_MINUTE, KEY_DAY, KEY_MONTH, KEY_YEAR,
            KEY_REMINDER };
    Cursor c = database.query(DATABASE_TABLE, columns, 
            KEY_YEAR + "=?"+ " AND " + KEY_MONTH + "=?" + " AND "+ KEY_DAY + "=?",
            new String[] {String.valueOf(year), String.valueOf(month), String.valueOf(day)}, 
            null, null, KEY_MONTH + " AND "
            + KEY_DAY);

它总是什么都不返回.当我删除以下内容时

    int year, month, day;
    String[] columns = new String[] { KEY_EVENTNAME, KEY_DESCRIPTION,
            KEY_HOUR, KEY_MINUTE, KEY_DAY, KEY_MONTH, KEY_YEAR,
            KEY_REMINDER };
    Cursor c = database.query(DATABASE_TABLE, …