VB.NET更新Access不会更新所有字段

Question

我目前遇到更新命令（OleDb）的问题。描述，类型和汇编字段正在更新;但是，部件号不是。部件号不是主键。我的代码如下。

Dim con As New OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\Office\Documents\SORINEX.accdb")
    Dim DataInsert As String = "UPDATE Product SET [Product Type] = @ProductType, [Description] = @Description, [Assembly] = @Assy_Yes WHERE [Part Number] = @PartNumber"
    con.Open()

    Using cmd As New OleDbCommand(DataInsert, con)
        cmd.Parameters.AddWithValue("@ProductType", Part_Type.Text)
        cmd.Parameters.AddWithValue("@Description", Part_Description.Text)
        cmd.Parameters.AddWithValue("@Assy_Yes", Assy_Yes)
        cmd.Parameters.AddWithValue("@PartNumber", Part_Number.Text)
        cmd.ExecuteNonQuery()
        MessageBox.Show("Part Updated.")
    End Using

    con.Close()

谢谢！