Well, you can query LDAP for the data. (Do not know how SQuirreL can do this unless you modify the code).
You need to query your LDAP for (objectclass=orclDBServer) and the data you are looking for is in the attribute orclnetdescstring and will look some thing like:
orclnetdescstring: (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=ordb0001.yourdomain.com)(PORT=1523))(CONNECT_DATA=(SERVICE_NAME=db.iss.com)))
-jim