Table of Contents for

MySQL in a Nutshell, 2nd Edition

Use this function to read and store all of a results set in a MYSQL_RES structure. When finished with these results, it’s necessary to use the mysql_free_result() function to free the memory allocated for storing the results set. The function returns NULL if it’s unsuccessful or if the query is not the type that would return any results (e.g., an UPDATE statement). Here is an example:

...
mysql = mysql_init(NULL);
mysql_real_connect(mysql,"localhost","user","password",
                   "workrequests",0,NULL,0);
mysql_query(mysql,"SELECT * FROM users");
result = mysql_store_result(mysql);
num_fields = mysql_field_count(mysql);
while((row = mysql_fetch_row(result)) != NULL)
   {
    for(i = 0; i < num_fields; i++)
      {
       field = mysql_fetch_field_direct(result, i);
       printf("%s: %s, ", field->name, row[i]);
      }
     printf("\n");
    }
mysql_free_result(result);
...

See the example for the mysql_fetch_row() function earlier in this chapter for an alternative method.