更新行sql服務器中的特定屬性

Question

我需要一個查詢來更新用戶表。我寫下了一個，它工作正常。 但我需要根據Proc發送的參數更新特定屬性，任何人都有任何好主意？

--table 
users(userID,firstname,lastName,age,UserTypeID,classID,SectionID) 
--SP 

'CREATE Proc UpdateUsers 
    (
    @pUserID int , 
    @pFirstName varchar(50), 
    @pLastName varchar(50), 
    @pAge int, 
    @pUserTypeID int, 
    @pClassID int, 
    @pSectionID int 
) 
    as 
    if not exists (select 'true' from Users where UserID=@pUserID) 
    begin 
print ('operation cannot complete; No such User founded, please enter valid UserID') 
return 
    end 

    if exists (select 'true' from UserTypes where UserTypeID=@pUserTypeID) 
    begin 
if exists (select 'true' from SectionsClasses where ClassID=@pClassID and 
         SectionID=@pSectionID) 
    update users set FirstName=@pFirstName, 
          LastName=@pLastName, 
          Age=@pAge, 
          UserTypeID=@pUserTypeID, 
          ClassID=@pClassID, 
          SectionID=@pSectionID 

      where UserID=@pUserID 
     else 
    print ('operation cannot complete; No such Class OR Section founded, please enter valid ClassID AND DectionID') 
end 
else 
print ('operation cannot complete; No such UserType founded') 

GO' 

Answer 1

您可以使用COALESCE返回它的第一個非NULL表達式，讓您通過NULL你不想更新的任何值。你SET會是什麼樣子：

set FirstName=COALESCE(@pFirstName,FirstName), 
    LastName=COALESCE(@pLastName,LastName, 
    Age=COALESCE(@pAge,Age), 
    UserTypeID=COALESCE(@pUserTypeID,UserTypeID), 
    ClassID=COALESCE(@pClassID,ClassID), 
    SectionID=COALESCE(@pSectionID,SectionID) 

正如你可以看到希望，如果任何參數是NULL，我們只需設置列等於本身。