使用 vb.net 更新 SQL Server 数据库中的表

Question

I have a SQL Server database with two tables:

tblEmp with columns:

EmpNum, EmpName, EmpAge, EmpAdress, EmpDegree, EmpJobTitle, EmpPhone 

and the column UnitID that used to set the relationship between the two tables

tblUnits with columns:

UnitID, UnitName

In VB the code is:

Public Class Form1
    Dim con As New SqlConnection("server=.....etc")
    Dim adapter As SqlDataAdapter
    Dim dt As New DataTable
    Dim cmdb As New SqlCommandBuilder

    Private Sub btnUpdate_Click.......
        Dim row As DataRow = dt.Rows.Find(txtNum.Text)
        row(0) = txtNum.Text
        row(1) = txtName.Text
        row(2) = txtAge.Text
        row(3) = txtAdress.Text
        row(4) = txtDegree.Text
        row(5) = txtJob.Text
        row(6) = txtPhone.Text
        row(7) = cmbunits.Text
        cmdb = New SqlCommandBuilder(adapter)
        adapter.Update(dt)

I get this error:

Additional information: Dynamic SQL generation is not supported against multiple base tables.

Answer 1

A command builder uses the query in the SelectCommand of your data adapter to generate the other commands. That can only happen under certain circumstances. One of those circumstances is that the query does not involve multiple tables. The error message indicates that that is not true in your case. You need to create the UpdateCommand , etc, yourself.