oracle 可以通过导向配置服务命名，也可以通过配置文件配置目录如下：
D:\oracle\product\10.2.0\client_1\NETWORK\ADMIN\tnsnames.ora

通过tnsnames.ora文件修改

LOC76HD_ORCL =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = orcl)
    )
  )