Need Trigger reject when update more than 1 row

Question

I need make a trigger who rejects when a user intents update more than one record.
The user only can update one row, but when update without WHERE all data was modified and cause problems.
Thanks,
MIGUEL ANGEL CARO
[email protected]

Answer 1

YTou can keep track of the number of updated records in a global package variable, as in the next example.
create or replace package pkg_test as
g_count number;
procedure p_reset;
procedure p_increase;
function f_updated return number;
end;
create or replace package body pkg_test as
procedure p_reset is
begin
g_count := 0;
end;
procedure p_increase is
begin
g_count := g_count + 1;
end;
function f_updated return number is
begin
return g_count;
end;
end;
create table ttemp (t_col varchar2(10))
create trigger bu_tmp before update on ttemp
begin
pkg_test.p_reset;
end;
create trigger au_tmp after update on ttemp for each row
begin
if pkg_test.f_updated > 0 then
raise_application_error(-20000,'Trying to update more than 1 record at the same time');
end if;
pkg_test.p_increase;
end;