Mysql C API problems

hi there 

the present serves for some clearing some doubts i have: 

1 - if i wanna make an action based on the fact that a query i just made 
won't return results (empty set), how can i test that? 

will this do? 
if(!mysql_query(myData, query) 
{ 
   results = mysql_store_results(myData); 

   if(mysql_num_rows() == 0) 
   { 
       //action; 
   } 
} 

2 - if the the row is made of one single field wich in turn is an integer, 
how can i address to it's value? 

will this do? 
row = mysql_fetch_row( results ); 

if(row[0]!=NULL) 
{ 
tempo=_registo[0]->decimals; //?!??!?!? 
//other actions here
}//if 

thank u in advance, 
Compliments 




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