Java 更新查询以设置其他表中的值

有谁能告诉我这个问题出了什么问题吗

String squery="update Room set GuestDetails.GuestCode=Room.GuestCode, GuestDetails.Title=Room.Title, GuestDetails.FirstName=Room.FirstName, GuestDetails.LastName=Room.LastName, GuestDetails.Country=Room.Country, GuestDetails.State=Room.State, GuestDetails.City=Room.City, GuestDetails.ContactNo=Room.ContactNo from GuestDetails inner join Room on Room.RoomNo="+rn+" and GuestCode="+gc+"";       

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我正在尝试更新房间并从GuestDetails中设置值。如果我输入GuestCode=1，则GuestCode为1的客人应设置在RoomNo say 101。请帮助我。

我没有您的表结构或数据，但请尝试以下操作

UPDATE Room
   SET GuestDetails.GuestCode = Room.GuestCode,
       GuestDetails.Title = Room.Title,
       GuestDetails.FirstName = Room.FirstName,
       GuestDetails.LastName = Room.LastName,
       GuestDetails.Country = Room.Country,
       GuestDetails.State = Room.State,
       GuestDetails.City = Room.City,
       GuestDetails.ContactNo = Room.ContactNo
 where GuestDetails inner join Room on Room.RoomNo="+rn+" and GuestCode="+gc+

使用where而不是from