如何判断数据库字段的值是否为空?
Dim itemX As ListItem
ListView1.ListItems.Clear
rs.Open "select * from " + tv1.SelectedItem.Text, conn
For icol = 0 To rs.Fields.Count - 1
Set itemX = ListView1.ListItems.Add(, , icol + 1)
itemX.SubItems(1) = rs.Fields(icol).Name
itemX.SubItems(2) = rs.Fields(icol).Type
itemX.SubItems(3) = rs.Fields(icol).DefinedSize
Next icol
rs.Close