select @city_data_ip=city_data_ip,@city_data_ip=city_data_port,@city_data_port=city_control_ip,@city_control_port=city_control_port from net_city where net_city = @city_id
select top 1 @city_data_ip=city_data_ip, @city_data_ip = city_data_port,@city_data_port= city_control_ip,@city_control_port city_control_port from net_city where net_city = @city_id
select @city_data_ip=city_data_ip,@city_data_ip=city_data_port,@city_data_port=city_control_ip,@city_control_port=city_control_port from net_city where net_city = @city_id
select top 1 @city_data_ip=city_data_ip, @city_data_ip = city_data_port,@city_data_port= city_control_ip,@city_control_port city_control_port from net_city where net_city = @city_id