If you want to do update another column when execute an update on table, you can use before update trigger. If you use after update trigger, you can get some errors. if you use pragma autonomous_transaction parameter as declare in trigger you can get errors like that are “ORA-00060: deadlock detected while waiting for resource”, “ORA-06512: at “trigger_name” line 7″,”ORA-04088:error during execution of trigger “trigger_name”” if you don’t use, you can get errors like that are “ORA-04091: table tablename is mutating, trigger/function may not see it”,”ORA-06512: at trigger_name”, line 6″,”ORA-04088: error during execution of trigger trigger_name”
You can resolve this problem with using before update trigger. You can update another column of updating the same table.
Trigger Example
My example is about that If status column of table1 change from 0 to 1, I will write another columns that are name, surname and studentno at the same table table1.
create table table1 (id number, status number, name varchar2(100), surname varchar2(100), studentno varchar2(100),address varchar2(500),city varchar2(100));
create or replace trigger trg_trigger_name_upt
before update of status on table1
referencing OLD as old NEW as new
for each row
v_studentno varchar2(100);
beginIF :old.status = 0 AND :new.status = 1 and UPDATING THEN
:new.name := ‘Fatih’;
:new.surname := ‘Acar’;
v_studentno := seq_studentno.nextval;
:new.studentno := v_studentno;END IF;
end;
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