如何使用ASP.NET在Access数据库中插入关系数据

Question

I have two relational tables: the Profiles table which contains 3 kinds of user roles (Manager, Developer, Common User) and the Users table which contains information about the user and their roles ID (Profile_ID field) in the Access 2010 database.

I created a Webform in ASP.NET which should simply register users, asking for their names, selecting their roles in a dropdown list and inserting it all in the Access database. As in the following code:

Dim cs As String = ConfigurationManager.ConnectionStrings("Access 2010").ConnectionString
    Dim cn As New OleDbConnection(cs)
    Dim cmd As New OleDbCommand
    With cmd
        .CommandText = "INSERT INTO Users (nome, Profile_ID) VALUES ('" & Me.txtNome.Text & "', " & Me.ddRoles.SelectedIndex & ")"
        .Connection = cn
        .Connection.Open()
        .ExecuteNonQuery()
        .Connection.Close()
        .Dispose()
    End With
    cn.Dispose()

It happens that I can't insert in the database because they have a relationship between each other, it gives me an error. Actually, I just need to insert data in the Users table 'cause the roles are fixed. How can I do it?

EDIT

The error I get is You can not add or change records, it is necessary that they have a related record in table 'Profiles'.

Answer 1

Change your command text to take the SelectedValue of the dropdown instead of the selected index.

.CommandText = "INSERT INTO Users (nome, Profile_ID) VALUES ('" & Me.txtNome.Text & "', " & Me.ddRoles.SelectedValue & ")"

If that doesn't work you need to make sure that the drop down is being bound properly to the Role name/id.

Answer 2

插入表名（papercode，paper type，semster，dato）中的值（'“＆textbox1.text＆”'，'“＆dropdownlist1.text＆”'）