How To Use ADO to Access Objects Through an ADSI LDAP Provider


The Active Directory Service Interfaces (ADSI) Lightweight Directory Access Protocol (LDAP) provider implements OLE DB interfaces that allow you to use ActiveX Data Objects (ADO) to access objects in LDAP compliant directories. You must create an ADO connection object and set its Provider property to "ADsDSOObject". You can specify any string, including "", as the connection string (first argument) of the ADO connection object's open method.

The connection object Execute method's CommandText (first object) is an LDAP query composed of four elements separated by semicolons, in the following format:


  • server is the name (or IP address) of the server hosting the directory.
  • adsidn is the distinguished name (DN) of the starting point for your query expressed ADsPath format with "/" separators and the root of the namespace to the left. You can also use an X.500 style attributed name format with the relative distinguished names separated by commas and the root of the name space to the right.
  • 1dap filter is the LDAP filter string (see rfc2254).
  • attributescsv is a comma separated list of names of the attributes to be returned for each row in the recordset.
  • scope is either: base, onelevel, or subtree.
NOTE: rfc2253 specifies the LDAP syntaxes on which the ADSI LDAP syntax is based.

To return the ADsPath, class, and cn attributes of all the objects in all the recipient containers in an Exchange server, you can use the following CommandText (in URL format):

or (in attributed name format):
     <LDAP://server/cn=recipients,ou=site,o=organization>, _

More Information

The following Visual Basic sample code illustrates this query:

Sample Code

  Dim conn As ADODB.Connection
Dim rs As ADODB.Recordset

Set conn = New ADODB.Connection
conn.Provider = "ADSDSOObject"
conn.Open "ADs Provider"

Set rs = conn.Execute( _
"<LDAP://server/o=organization/ou=site/cn=recipients>;" _
& "(objectClass=*);ADsPath,objectClass,cn;subtree")

While Not rs.EOF
Debug.Print rs.Fields(0).Value, rs.Fields(1).Value, _



For a listing and explanation of common LDAP RFCs, including RFC 2253 and RFC 2254, please see the following article in the Microsoft Knowledge Base:

221606 Common LDAP RFCs
For additional information, click the article number below to view the article in the Microsoft Knowledge Base:

275917 PRB: ADSI 2.5 and MDAC 2.6 Compatibility Issues

ID d'article : 187529 - Dernière mise à jour : 4 août 2008 - Révision : 1