Mysql主键id问题

Question

Basically I'm doing a system where the user enters a Name,E-mail,password & User type and these inputs are to be saved into my local database. I am trying to create a Primary Key ID that automatically generates and increments the ID, so for the first input 1, second 2, third 3, etc.

Instead I'm getting a bunch of letters and random numbers such as the following; d7a8675a-c7cf-406a-983f-370d5b96fa62

Here's what I've written on the Visual Studio Database Designer

CREATE TABLE [dbo].[Users] (
    [Id]       int IDENTITY(1,1) PRIMARY KEY,
    [UserName] NCHAR (50)    NULL,
    [Email]    NCHAR (50)    NULL,
    [Password] NCHAR (50)    NULL,
    [Role]     NCHAR (15)    NULL
);

Also I forgot to mention that when I am accessing my Register.aspx page where the user is able to fill in the fields to be inserted into the DB i am calling the following on Click of the Register Button, could it be causing a problem wih my SQL code?

String insertQuery = "insert into Users (Id,UserName,Email,Password,Role) values (@Id ,@Uname ,@email ,@password ,@role)";
SqlCommand com = new SqlCommand(insertQuery, conn);
com.Parameters.AddWithValue("@Id", newGUID.ToString());
com.Parameters.AddWithValue("@Uname",TextBoxUN.Text);
com.Parameters.AddWithValue("@email", TextBoxEmail.Text);
com.Parameters.AddWithValue("@password", TextBoxPass.Text);
com.Parameters.AddWithValue("@role", DropDownListRole.SelectedItem.ToString());

Answer 1

First change table definition to:

CREATE TABLE [dbo].[Users] (
    [Id]       int IDENTITY(1,1) PRIMARY KEY NOT NULL,
    [UserName] NCHAR (50)    NULL,
    [Email]    NCHAR (50)    NULL,
    [Password] NCHAR (50)    NULL,
    [Role]     NCHAR (15)    NULL
);

and your code:

String insertQuery = "insert into Users (UserName,Email,Password,Role) values (@Uname ,@email ,@password ,@role)";
SqlCommand com = new SqlCommand(insertQuery, conn);
com.Parameters.AddWithValue("@Uname",TextBoxUN.Text);
com.Parameters.AddWithValue("@email", TextBoxEmail.Text);
com.Parameters.AddWithValue("@password", TextBoxPass.Text);
com.Parameters.AddWithValue("@role", DropDownListRole.SelectedItem.ToString());

You need to skip saving com.Parameters.AddWithValue("@Id", newGUID.ToString()); and allow IDENTITY to fill the values.

Answer 2

Your primary key definition is wrong Try this:

CREATE TABLE [dbo].[Users] (
    [Id]       int NOT NULL AUTO_INCREMENT,
    [UserName] NCHAR (50)    NULL,
    [Email]    NCHAR (50)    NULL,
    [Password] NCHAR (50)    NULL,
    [Role]     NCHAR (15)    NULL,
    PRIMARY KEY (id)
);

Edit after your edit:

Why are you filling in a new GUID as the id parameter?

Its pretty clear why you're getting these random strings as your id... If you define the id to automatically increment the number, you dont have to specify the id parameter