[转载]如何确定有多少人登陆数据库
信息来源：邪恶八进制信息安全团队（[url]www.eviloctal.com[/url]）Sub 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
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