如何使用rawquery方法在Android中使用SQLite对行进行排序？

Question

我正在使用以下方法从表中获取数据：

Cursor c = ourDatabase.rawQuery("SELECT " + KEY_SWIMMERLAPS + " * "
  + KEY_SPONSOR + " AS result FROM " + DATABASE_TABLE, null);

我想知道是否可以将其编辑为按KEY_SWIMMERLAPS 对结果进行排序。我认为以下内容可行：

Cursor c = ourDatabase.rawQuery("SELECT " + KEY_SWIMMERLAPS + " * "
  + KEY_SPONSOR + " AS result FROM " + DATABASE_TABLE, KEY_SWIMMERLAPS + " DESC");

但是，我收到错误，因为KEY_SWIMMERLAPS不是字符串：

SQLiteDatabase类型中的方法rawQuery（String，String []）不适用于参数（String，String）

Answer 1

您在rawQuery方法上使用了第二个参数，并期望用作订单子句。事实并非如此。第二个参数用于为SQL查询字符串中的?占位符提供值。使用以下应该可以做到这一点：

Cursor c = ourDatabase.rawQuery("SELECT " + KEY_SWIMMERLAPS + " * "
            + KEY_SPONSOR + " AS result FROM " + DATABASE_TABLE + " ORDER BY "+ KEY_SWIMMERLAPS+" DESC", null);