/// <summary> /// 使用已有的辅助类初始化 <see cref="Py.Sql.SqlHelper"/> 的新实例,新实例和参数使用同一个连接。 /// </summary> /// <param name="helper">The helper。</param> /// <exception cref="ArgumentNullException"><paramref name="helper" /> 为空。</exception> /// <exception cref="ArgumentException">传递的辅助类和当前实例的类型不相同。</exception> public MySqlHelper(DbHelper helper) { Thrower.ThrowArgumentNullExceptionIf(helper, "helper"); _connection = helper.Connection as MySqlConnection; Thrower.ThrowArgumentExceptionIf(_connection == null, "连接空"); }