Android 无法在使用后续查询时打开数据库文件错误

我有下面的代码，第一个cursor对象工作正常，但是当我执行另一个查询并将其分配给flightCursor时，它会给出错误

Cursor cursor = database.query( CityAndAirportsTable.notificationsTable, new String[] { CityAndAirportsTable.notifyFlightId },
                null, null, null, null, "Id DESC" );
        cursor.moveToFirst();
        while( !cursor.isAfterLast() ){
            String id = String.valueOf( cursor.getInt( 0 ) );
            Cursor flightCursor = database.query( CityAndAirportsTable.flightTable, new String[] { CityAndAirportsTable.fromDestinationCode,
            CityAndAirportsTable.toDestinationCode, CityAndAirportsTable.currentPrice }, CityAndAirportsTable.flightId + "=" + id,
                    null, null, null, null );
}

在flightCursor=database.query中，我得到了错误

Cursor cursor = database.query( CityAndAirportsTable.notificationsTable, new String[] { CityAndAirportsTable.notifyFlightId },
                null, null, null, null, "Id DESC" );
        cursor.moveToFirst();
        while( !cursor.isAfterLast() ){
            String id = String.valueOf( cursor.getInt( 0 ) );
            Cursor flightCursor = database.query( CityAndAirportsTable.flightTable, new String[] { CityAndAirportsTable.fromDestinationCode,
            CityAndAirportsTable.toDestinationCode, CityAndAirportsTable.currentPrice }, CityAndAirportsTable.flightId + "=" + id,
                    null, null, null, null );
}

日志

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关于stackoverflow也有类似的问题，但在我的例子中，第一个查询有效，但第二个查询失败。

完成后关闭光标！我想你打开的光标对象太多了

Cursor cursor = database.query( CityAndAirportsTable.notificationsTable, new String[] { CityAndAirportsTable.notifyFlightId },
                null, null, null, null, "Id DESC" );
cursor.moveToFirst();
while( !cursor.isAfterLast() ){
  String id = String.valueOf( cursor.getInt( 0 ) );
  Cursor flightCursor = database.query(
    CityAndAirportsTable.flightTable,
    new String[] { CityAndAirportsTable.fromDestinationCode,
      CityAndAirportsTable.toDestinationCode,
      CityAndAirportsTable.currentPrice },
    CityAndAirportsTable.flightId + "=" + id,
    null, null, null, null );

  /* Close the cursor here! */
  flightCursor.close();
  /* ---------------------- */
}

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希望这能解决您的问题

谢谢，我忘记了这一点。