/// <summary>
/// 将用户的未读短信息数量减小一个指定的值
/// </summary>
/// <param name="uid">用户ID</param>
/// <param name="subval">短消息将要减小的值,负数为加</param>
/// <returns>更新记录个数</returns>
public static int DecreaseNewPMCount(int uid, int subval)
{
if (appDBCache)
IUserService.DecreaseNewPMCount(uid, subval);
return DatabaseProvider.GetInstance().DecreaseNewPMCount(uid, subval);
}