MySQL 5.7 C API Developer Guide
my_bool
mysql_stmt_attr_get(MYSQL_STMT *stmt,
                    enum enum_stmt_attr_type option,
                    void *arg)
Can be used to get the current value for a statement attribute.
          The option argument is the option that you
          want to get; the arg should point to a
          variable that should contain the option value. If the option
          is an integer, arg should point to the
          value of the integer.
        
See Section 6.4.3, “mysql_stmt_attr_set()”, for a list of options and option types.