不可能吧。你是怎么打开这个表的呀。
Dim cnn As New ADODB.Connection
cnn.Open "Provider=Microsoft.Jet.OLEDB.3.51;Persist Security Info=False;Data Source=C:\aa\aa.mdb;Jet OLEDB:Database Password=aa"
Dim rs As New ADODB.Recordset
rs.Open "select * from aa", cnn, adOpenKeyset, adLockOptimistic
dim i as Integer
i=rs.Fields("字段名").ActualSize