Question

希望这个问题有意义。

基本上，我正在为单人作业制作手术系统。

我已经用用户名和密码等制作了一个基于服务的数据库和用户表。

登录名已全部排序。控制台会打印正确的RoleType并将用户登录到。

我疯了一个名为RoleType的枚举，我试图根据用户在

中的角色来更改

这是我目前为止的位置...

登录表单

    //Declare an enum to store roletypes
    public enum RoleTypes
    {
        practiceManager, 
        doctor,
        receptionist
    }

    private void btnLogin_Click(object sender, EventArgs e)
    {

        //Try and open a connection with database and run the code
        try
        {

            //Create new instance of sql connection, pass in the connection string for BayOneSurgerySystem.mdf to connect to database.
            SqlConnection conn = new SqlConnection(@"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=C:\Users\davie\Documents\UniWork\Software Engineering\SurgerySystem\SurgeryDatabase\BayOneLoginSystem.mdf;Integrated Security=True;Connect Timeout=30");

            //Create new instance of SQlCommand and pass in a query to be called to retrieve table data for username and passwords aswell as the connection object.
            SqlCommand cmd = new SqlCommand("SELECT * FROM Users WHERE Username = @username and Password = @password", conn);
            //This passes user input into @username and @password
            cmd.Parameters.AddWithValue("@username", txtBoxUsername.Text);
            cmd.Parameters.AddWithValue("@password", txtBoxPassword.Text);

            //Open connection with database
            conn.Open();

            //Create new instance of dataSet to hold the data retrieved from sql query
            DataSet ds = new DataSet();
            //Create new instance of DataAdpater to retrieve the data pass in Sql command
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            //using DataAdapter fill in dataSet wiht data if user input and stored data matches
            da.Fill(ds);

            //Close the connection now data table is filled with username and password
            conn.Close();

            //declare bool, true if there is a match with database and user input
            bool loginSuccess =  (ds.Tables[0].Rows.Count == 1);


            //if login success is true then open menu
            if (loginSuccess)
            {
                //Change state of enum RoleTypes bases on result from dataSet Role column.
                Console.WriteLine(ds.Tables[0].Rows[0]["Role"].ToString());

                try
                {
                    switch (ds.Tables[0].Rows[0]["Role"])
                    {
                        case "Doctor":
                            {
                                RoleTypes roleType = RoleTypes.doctor;
                                Console.WriteLine("Role type chnage to" + roleType.ToString());
                            }
                            break;
                        case "Practice Manager":
                            {
                                RoleTypes roleType = RoleTypes.practiceManager;
                                Console.WriteLine("Role type chnage to" + roleType.ToString());
                            }
                            break;
                        case "receptionist":
                            {
                                RoleTypes roleType = RoleTypes.receptionist;
                                Console.WriteLine("Role type chnage to" + roleType.ToString());
                            }
                            break;
                        default:
                            break;

                    }
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex);
                }


                Console.WriteLine("Logged in.");
                FrmMenu menu = new FrmMenu();
                this.Close();
                menu.Show();
            }
            else
            {
                MessageBox.Show("Invalid username or password.", "Error!", MessageBoxButtons.RetryCancel);
                Console.WriteLine("Not logged in");
            }

         }

        //If connection cant be opened diplsay error message and catch exception and print to console
        catch(Exception ex)
        {
            Console.WriteLine(ex);
            MessageBox.Show("Sorry can't connect");
        }
    }
}

}

这个想法是，可以在FrmMenu中引用公共枚举，并且将基于该枚举显示不同的控件。

它只是使用switch语句忽略了tryCatch，没有捕获任何异常？知道为什么吗？还是有一种更有效的方法？

预先感谢！

Answer 1

我已经做了类似的事情。我已经创建了角色和用户角色表。

CREATE TABLE [dbo].[Role](
    [RoleID] [nvarchar](10) NOT NULL,
    [RoleName] [nvarchar](50) NOT NULL,
    [Memo] [nvarchar](50) NOT NULL,
 CONSTRAINT [PK_SYS_Role] PRIMARY KEY NONCLUSTERED 
(
    [RoleID] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

GO

UserRole表

CREATE TABLE [dbo].[UserRole](
    [UserRoleID] [nvarchar](10) NOT NULL,
    [UserID] [nvarchar](10) NOT NULL,
    [RoleID] [nvarchar](10) NOT NULL,
 CONSTRAINT [PK_UserRole] PRIMARY KEY CLUSTERED 
(
    [UserRoleID] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

GO

ALTER TABLE [dbo].[UserRole]  WITH CHECK ADD  CONSTRAINT [FK_UserRole_REF_Role] FOREIGN KEY([RoleID])
REFERENCES [dbo].[Role] ([RoleID])
GO

ALTER TABLE [dbo].[UserRole] CHECK CONSTRAINT [FK_UserRole_REF_Role]
GO

ALTER TABLE [dbo].[UserRole]  WITH CHECK ADD  CONSTRAINT [FK_UserRole_REF_USER] FOREIGN KEY([UserID])
REFERENCES [dbo].[User] ([UserID])
GO

ALTER TABLE [dbo].[UserRole] CHECK CONSTRAINT [FK_UserRole_REF_USER]
GO

在您的表单上，根据您的登录用户调用查询

如何显示基于访问级别的菜单选项？

1 个答案: