int mysql_stmt_fetch(MYSQL_STMT * stmt);
stmt- a statement handle, which was previously allocated by mysql_stmt_init().
Fetch the result from a prepared statement into the buffer bound by mysql_stmt_bind_result(). Returns
0 for success,
MYSQL_NO_DATA if the end of the result set has been reached, or
MYSQL_DATA_TRUNCATED if one or more values are truncated.
Note that all columns must be bound by the application before calling mysql_stmt_fetch().
Data are transferred unbuffered without calling mysql_stmt_store_result() which can decrease performance (but reduces memory cost).