如何确定有多少人登陆数据库

ShowUserRosterMultipleUsers()

　　 Dim cn As New ADODB.Connection

　　 Dim cn2 As New ADODB.Connection

　　 Dim rs As New ADODB.Recordset

　　 Dim i, j As Long

　　 cn.Provider = "Microsoft.Jet.OLEDB.4.0"

　　 cn.Open "Data Source=c:Northwind.mdb"

　　 cn2.Open "Provider=Microsoft.Jet.OLEDB.4.0;" _

　　 & "Data Source=c:Northwind.mdb"

　　 " The user roster is exposed as a provider-specific schema rowset

　　 " in the Jet 4 OLE DB provider. You have to use a GUID to

　　 " reference the schema, as provider-specific schemas are not

　　 " listed in ADO"s type library for schema rowsets

　　 Set rs = cn.OpenSchema(adSchemaProviderSpecific, _

　　 , "{947bb102-5d43-11d1-bdbf-00c04fb92675}")

　　 "Output the list of all users in the current database.

　　 Debug.Print rs.Fields(0).Name, "", rs.Fields(1).Name, _

　　 "", rs.Fields(2).Name, rs.Fields(3).Name

　　 While Not rs.EOF

　　 Debug.Print rs.Fields(0), rs.Fields(1), _

　　 rs.Fields(2), rs.Fields(3)

　　 rs.MoveNext

　　 Wend

　　　　End Sub