参考官方文档GET DIAGNOSTICS的使用，下面是一个参考例子：

create or replace function public.test()
returns void
as $$
declare
/**
* create table public.t(id int);
**/
    v_insert_count int;
	v_update_count int;
begin
    insert into public.t values(100),(101),(102);
	GET DIAGNOSTICS v_insert_count = ROW_COUNT;
    raise notice 'v_insert_count=%',v_insert_count;
	
	update public.t set id=id+1 where id>101;
	GET DIAGNOSTICS v_update_count = ROW_COUNT;
    raise notice 'v_update_count=%',v_update_count;
end;	
$$ language plpgsql;

执行结果如下：

postgres=# select public.test();
NOTICE:  v_insert_count=3
NOTICE:  v_update_count=1
 test 
------
 
(1 row)