how to map sql column to custom names

var sql = "SELECT Contact_Cli_ID AS Contact_ID,
                  Clt_ID AS Client_ID,
                  Contact_Cli_Nom AS Nom,
                  Contact_Cli_Prenom AS Prenom,
                  Contact_Tel_Fixe AS Telephone,
                  Contact_Cli_Fax AS Telecopie,
                  Contact_Cli_Mail AS Mail,
                  Contact_Portable AS Portable
           FROM   Contact_Clients
           ...";