Cannot insert the value NULL into column 'UserId'

问题

I am getting this exception and can not figure out why: Cannot insert the value NULL into column 'UserId'

This is my code:

<asp:TextBox ID="FirstNameBox" runat="server" />
<br />
<br />
<asp:TextBox ID="LastNameBox" runat="server" />
<asp:SqlDataSource
    ID="InsertText"
    runat="server"
    ConnectionString="<%$ ConnectionStrings:DefaultConnection %>"
    InsertCommand="INSERT INTO UserForm (UserId,FirstName,LastName) VALUES  (@UserId,@FiName,@LaName)">

   <InsertParameters>
      <asp:ControlParameter Name="FiName" ControlID="FirstNameBox" PropertyName="Text" />
      <asp:ControlParameter Name="LaName" ControlID="LastNameBox" PropertyName="Text" />
      <asp:Parameter Name="UserId" />
   </InsertParameters>
 </asp:SqlDataSource>

This is what I have in my code behind file:

public void button1_Click(object sender, System.EventArgs e)
{
   InsertText.Insert();
}

回答1:

Currently you have set your table in way, that you HAVE TO supply a value for UserId. If that isn't an intended behavior, I'd suggest to change the column in SQL server to auto-incremented...

It should look like this for instance:

[UserId]       INT            IDENTITY (1, 1) NOT NULL

EDIT based on comments:

I set the UserId Column to be the primary and foreign key. I set the UserId to be the GUID. When I checked the table the UserId is already there. I just want to add a users first or last name.

Not sure what's your problem then, first you're talking about INSERT, now you're talking about setting values for the existing record. If you want to update the existing record, you need to get the id first and update the values accordingly

An example SQL command may look similar to this:

UPDATE UserForm SET FirstName = @FirstName, LastName = @LastName WHERE UserId = @UserId

Insert does what it says - inserts a new record to the table.

回答2:

you do not set any value for the userId column. if it already has been set identity. you can remove the userid when you insert the data.

回答3:

I just grabbed the userid and performed an update command.

Guid userGuid = (Guid)Membership.GetUser(User.Identity.Name).ProviderUserKey;

UserIdLabel.Text = userGuid.ToString();

来源：https://stackoverflow.com/questions/15346608/cannot-insert-the-value-null-into-column-userid

标签

sql-insert

sqldatasource