有没有办法在使用JOIN子句时停止列的自动排序

Question

I'm setting up this datagridview with lots of data from different data tables so I used JOIN. However, the datagridview seems to display the columns in order of the table.

This is my code:

 Using conn As New MySqlConnection(connString)
            conn.Open()
            Using cmd As New MySqlCommand("SELECT * FROM tblclientprofile LEFT JOIN tblbusinessinfo ON tblbusinessinfo.B_IdNo = tblclientprofile.IdNo 
                                            LEFT JOIN tblownerprofile ON tblownerprofile.O_IdNo = tblbusinessinfo.B_IdNo
                                            LEFT JOIN tblbusinessprofile ON tblbusinessprofile.BP_IdNo = tblownerprofile.O_IdNo
                                            LEFT JOIN tblbusinessoperations ON tblbusinessoperations.BO_IdNo = tblbusinessprofile.BP_IdNo
                                            LEFT JOIN tblbfs ON tblbfs.BF_IdNo = tblbusinessoperations.BO_IdNo
                                            LEFT JOIN tblcapitalstructure ON tblcapitalstructure.IdNo = tblbfs.BF_IdNo
                                            LEFT JOIN tblassetsize ON tblassetsize.IdNo = tblcapitalstructure.IdNo
                                            LEFT JOIN tblsaleshistory ON tblsaleshistory.IdNo = tblassetsize.IdNo
                                            LEFT JOIN tbldomesticmarket ON tbldomesticmarket.IdNo = tblsaleshistory.IdNo
                                            LEFT JOIN tblexportmarket ON tblexportmarket.IdNo = tbldomesticmarket.IdNo
                                            LEFT JOIN tblprodservline ON tblprodservline.IdNo = tblexportmarket.IdNo
                                            ", conn)
                With cmd
                    .CommandType = CommandType.Text
                End With
                Using da As New MySqlDataAdapter
                    da.SelectCommand = cmd
                    Using dt As New DataTable
                        da.Fill(dt)
                        dgv2.DataSource = dt
                    End Using
                End Using
            End Using
        End Using

tblclientprofile has fields such as: IdNo, Status, Name, Position, etc tblbusinessinfo has fields such as: BusinessRegNo, BusinessName, BusinessType etc.

datagridview's results is IdNo, Status, Name, Position, BusinessRegNo, BusinessName, BusinessType in order.

What i want is to display this in order of: IdNo, Name, Position, BusinessRegNo, BusinessName, BusinessType, Status

Answer 1

My simple solution to the columns being out of order is to add this loop that sets the DisplayIndex to the Index . Put this loop right after your call dgv2.DataSource = dt

For Each col As DataGridViewColumn In dgv2.Columns 
    col.DisplayIndex = col.Index
Next

The Index is assigned to each column as they are added. I'm not sure why the DisplayIndex becomes out of order, but the above script will fix it.

Also, I'd like to point out that this has nothing to do with the SQL. This is the result of something going on in the DataGridView. With that said, you should still select your columns instead of using *.