यह उपाय आपके लिए उपयुक्त हो। आप एलडीएपी सर्वर को स्वयं क्वेरी कर सकते हैं और अपने कोड में पूर्ण कनेक्शन स्ट्रिंग डाल सकते हैं।
आप इस कोड के साथ LDAP से कनेक्शन स्ट्रिंग को हल कर सकते हैं:
using (OracleConnection connection = new OracleConnection())
{
connection.ConnectionString = "Data Source=" + ResolveServiceNameLdap("alias") + ";User id=user;Password=password";
connection.Open();
}
...
private static string ResolveServiceNameLdap(string serviceName)
{
string tnsAdminPath = Path.Combine(@"C:\oracle\network", "ldap.ora");
// or something more advanced...
// ldap.ora can contain many LDAP servers
IEnumerable<string> directoryServers = null;
if ( File.Exists(tnsAdminPath) ) {
string defaultAdminContext = string.Empty;
using ( var sr = File.OpenText(tnsAdminPath) ) {
string line;
while ( ( line = sr.ReadLine() ) != null ) {
// Ignore comments or empty lines
if ( line.StartsWith("#") || line == string.Empty )
continue;
// If line starts with DEFAULT_ADMIN_CONTEXT then get its value
if ( line.StartsWith("DEFAULT_ADMIN_CONTEXT") )
defaultAdminContext = line.Substring(line.IndexOf('=') + 1).Trim(new[] { '\"', ' ' });
// If line starts with DIRECTORY_SERVERS then get its value
if ( line.StartsWith("DIRECTORY_SERVERS") ) {
string[] serversPorts = line.Substring(line.IndexOf('=') + 1).Trim(new[] { '(', ')', ' ' }).Split(',');
directoryServers = serversPorts.SelectMany(x => {
// If the server includes multiple port numbers, this needs to be handled
string[] serverPorts = x.Split(':');
if ( serverPorts.Count() > 1 )
return serverPorts.Skip(1).Select(y => string.Format("{0}:{1}", serverPorts.First(), y));
return new[] { x };
});
}
}
}
// Iterate through each LDAP server, and try to connect
foreach ( string directoryServer in directoryServers ) {
// Try to connect to LDAP server with using default admin contact
try {
var directoryEntry = new DirectoryEntry("LDAP://" + directoryServer + "/" + defaultAdminContext, null, null, AuthenticationTypes.Anonymous);
var directorySearcher = new DirectorySearcher(directoryEntry, "(&(objectclass=orclNetService)(cn=" + serviceName + "))", new[] { "orclnetdescstring" }, SearchScope.Subtree);
SearchResult searchResult = directorySearcher.FindOne();
var value = searchResult.Properties["orclnetdescstring"][0] as byte[];
if ( value != null )
connectionString = Encoding.Default.GetString(value);
// If the connection was successful, then not necessary to try other LDAP servers
break;
} catch {
// If the connection to LDAP server not successful, try to connect to the next LDAP server
continue;
}
}
// If casting was not successful, or not found any TNS value, then result is an error
if ( string.IsNullOrEmpty(connectionString) )
throw new Exception("TNS value not found in LDAP");
} else {
// If ldap.ora doesn't exist, then throw error
throw new FileNotFoundException("ldap.ora not found");
}
return connectionString;
}