作用:用于取得局域网或Internet环境中的主机名和IP地址.
如果查询失败,则提示系统错误
查询www.qq.com的IP地址
select UTL_INADDR.get_host_address('www.qq.com') from dual;
查询本机IP地址
select UTL_INADDR.get_host_address() from dual;
查询局域网内yuechu的IP地址
select UTL_INADDR.get_host_address('yuechu') from dual;
返回本机主机名
select UTL_INADDR.get_host_name() from dual;
返回局域网内指定IP地址的主机名
select UTL_INADDR.get_host_name('192.168.0.156') from dual;
返回intrenet中指定IP地址的网址
select UTL_INADDR.get_host_name('219.153.50.84') from dual;