Question

我有一个以下形式的简单数据库：

   Users{
    UserID (PK)
    Username
    Email
    FirstName
    SecondName
   }

   Groups{
    GroupID (PK)
    GroupName
   }

   Membership{
    UserID (FK)
    GroupID (FK)
   }

成员资格是其他两个表的“中间人”。当用户注册时，他们的用户名将插入到“用户和组”表中（自己创建一个组）。 UserID和GroupID应引用Users和Groups中的相应列。

当用户注册时，这是使用三个INSERT INTO语句执行此操作的最佳方法，如下所示：

if (db.Execute("INSERT INTO Users(Username, Email, FirstName, SecondName) VALUES(@0,@1,@2,@3)", username, email, firstName, secondName) < 1
                || db.Execute("INSERT INTO Groups(GroupName) VALUES(@0)", username) < 1
                || db.Execute("INSERT INTO Membership(UserID, GroupID) VALUES(@0, @1)",?????????????) < 1)
            {
                <p class="error">Wasn't able to insert User record</p>//insert failed
            }else {
            Response.Redirect("Success.cshtml"); //success
            }

我应该在第三个INSERT INTO语句中添加什么内容才能正确插入userID和相应的groupID？

Answer 1

这是数据库逻辑......把它放在数据库中。

CREATE PROCEDURE dbo.AddUserAndGroup
  @username   NVARCHAR(255),
  @email      VARCHAR(320),
  @firstname  NVARCHAR(32),
  @secondName NVARCHAR(32)
AS
BEGIN
  SET NOCOUNT ON;

  DECLARE @UserID INT, @GroupID INT;

  INSERT dbo.Users(Username, Email, FirstName, SecondName)
    SELECT @username, @email, @firstname, @secondname;

  SELECT @UserID = SCOPE_IDENTITY();

  -- could probably simply rest with OUTPUT, just keeping it simple/consistent

  INSERT dbo.Groups(GroupName) SELECT @username;

  SELECT @GroupID = SCOPE_IDENTITY();

  INSERT dbo.Membership(UserID, GroupID) SELECT @UserID, @GroupID;
END
GO

现在你应该可以说出这样的话（请原谅我，如果我没有正确的客户端语法，但我正试图接近）：

if (db.Execute("EXEC dbo.AddUserAndGroup @0,@1,@2,@3;", 
    username, email, firstName, secondName) < 1
{
  <p class="error">Wasn't able to insert User record</p>//insert failed
}
else
{
  Response.Redirect("Success.cshtml"); //success
}

将插入传播到多个数据库

1 个答案: