Option Explicit
Const ConnectionString = "你的联接数据放这"
Private Sub Command1_Click()
    Dim conn As New ADODB.Connection
    Dim rs As ADODB.Recordset
    Dim fl As Field
    conn.Open ConnectionString
    Set rs = conn.Execute("select * from DbTable")
    For Each fl In rs.Fields
        Combo1.AddItem fl
    Next
End Sub