./mysql_test 
Running test using mysql_use_results():

-1 returned from affected_rows()
0 returned from num_rows()

1 ttyS0 9600 8 n 1 1 sign 
2 ttyS1 1200 8 n 1 1 direction 
3 ttyS2 1200 8 n 1 1 direction 

-1 returned from affected_rows()
3 returned from num_rows()


Running test using mysql_store_results():

3 returned from affected_rows()
3 returned from num_rows()

1 ttyS0 9600 8 n 1 1 sign 
2 ttyS1 1200 8 n 1 1 direction 
3 ttyS2 1200 8 n 1 1 direction 

3 returned from affected_rows()
3 returned from num_rows()