/*      query_with_result=(flag)     */
static VALUE query_with_result_set(VALUE obj, VALUE flag)
{
    if (TYPE(flag) != T_TRUE && TYPE(flag) != T_FALSE)
        rb_raise(rb_eTypeError, "invalid type, required true or false.");
    GetMysqlStruct(obj)->query_with_result = flag;
    return flag;
}