What is meant by Mutating error

Question

Hi friends,
i am getting mutating error,
how to overcome this problem.
thanking u.
hema

Answer 1

To over come its better follow
This package will contain yours rowid which is being insert of emp table
create or replace package state_pkg
as
type ridArray is table of rowid index by binary_integer;
newRows ridArray;
empty ridArray;
end;
This will flush or empty yours array wid empty one array cause there may be rowids
create or replace trigger emp_bi
before insert on emp
begin
state_pkg.newRows:=state_pkg.empty;
end;
This will move insert rows rowid in newRows array
create or replace trigger emp_ai
after insert on emp for each row
begin
state_pkg.newRows(state_pkg.newRows.count+1):=:new.rowid;
end;
This will backup yours data in empback which is being inserting in emp table note here at line 2 there is no for each row clause which means its statment level trigger and statment level trigger dont mutate because its fire at table level not for individaul rows.
create or replace trigger emp_aif
--> after insert on emp
begin
for i in 1..state_pkg.newRows.count
loop
insert into empback
select * from emp where rowid=state_pkg.newRows(i);
end loop;
end;
what this code does its just capture the rowids in a temp (newRows) array and then after getting insert records in table each row is fetching from emp table into empback on behalf of package array newRows (which contains rowid)
I hope u got it how to avoid mutate.
Khurram Siddiqui
[email protected]