///<summary>
/// 论坛登陆信息更新
///</summary>
/// <param name="userId">用户ID</param>
/// <param name="ip">最后登陆IP</param>
/// <param name="truePassword">新的随机密码</param>
/// <returns>返回组名,返回空或null为无效</returns>
public string BBSLoginUpdate(int userId, string ip, string truePassword)
{
string groupName;
groupName = dal.BBSLoginUpdate(userId, ip, truePassword);
return(groupName);
}