"An autonomous transaction sees all changes by hand transact.
HelloI'm trying to reproduce designs "a stand-alone transaction sees all changes made by the main transaction" on:
Oracle® Database Application Developer's Guide - FundamentalsI implemented a simple case...
10g Release 2 (10.2)
Part Number B14251-01
chapter 2 SQL Processing for Application Developers
Paragraph : Autonomous Transactions
create table emp_ as select * from empBefore any change...
begin
update emp_ set hiredate=hiredate+100 where empno=7934;
end;
create or replace trigger trg_emp_
after insert or update on emp_
for each row
declare
pragma autonomous_transaction;
emp_var emp.hiredate%type;
begin
select hiredate
into emp_var
from emp_
where empno=:new.empno;
dbms_output.put_line('empno: '||:new.empno);
dbms_output.put_line('old hiredate: '||:old.hiredate);
dbms_output.put_line('new hiredate: '||:new.hiredate);
end;
SQL> select empno,hiredate from emp_;After the change...
EMPNO HIREDATE
----- -----------
5498 21/4/1982
5499 11/10/1981
5411 10/10/1981
5410 10/10/1982
7369 17/12/1980
7499 20/2/1981
7521 22/2/1981
7566 2/4/1981
7654 28/9/1981
7698 1/5/1981
7782 9/6/1981
7788 19/4/1987
7839 17/11/1981
7844 8/9/1981
7876 23/5/1987
7900 3/12/1981
7902 3/12/1981
7934 23/1/1982
SQL> beginAccording to the doc select Oracle of the autonomous transaction should not see the change to column hiredate in table in the main transaction (in the anonymous block)...
2 update emp_ set hiredate=hiredate+100 where empno=7934;
3 end;
4 /
empno: 7934
old hiredate: 23/01/82
new hiredate: 03/05/82
PL/SQL procedure successfully completed
Matter what I've done wrong... ???
Thank you
SIM
Simon:
As Tubby has pointed out, your dbms_output orders do not display the selected value in the trigger. Your trigger based demonstration should look like:
SQL> SELECT * FROM t;
ID DT
---------- -----------
1 05-SEP-2009
2 17-JUL-2009
SQL> CREATE TRIGGER t_ai
2 AFTER INSERT OR UPDATE ON t
3 FOR EACH ROW
4 DECLARE
5 PRAGMA AUTONOMOUS_TRANSACTION;
6 l_dt t.dt%TYPE;
7 BEGIN
8 SELECT dt INTO l_dt
9 FROM t
10 WHERE id = :new.id;
11 DBMS_OUTPUT.Put_Line ('ID: '||:new.id);
12 DBMS_OUTPUT.Put_Line ('Old dt: '||:old.dt);
13 DBMS_OUTPUT.Put_Line ('New dt: '||:new.dt);
14 DBMS_OUTPUT.Put_Line ('Aut dt: '||l_dt);
15 END;
16 /
Trigger created.
SQL> UPDATE t SET dt = sysdate WHERE id = 2;
ID: 2
Old dt: 17-JUL-2009
New dt: 25-OCT-2009
Aut dt: 17-JUL-2009
1 row updated.
Thus, the transaction, select automomous doesn't see the modified value of dt.
I know you are just trying to understand transactions automomous here and would never sometihg like that in the production of right? :-)
Your trigger, as written, has some interesting side effects because of the automomous transaction. For example:
SQL> INSERT INTO t VALUES(3, sysdate - 25);
INSERT INTO t VALUES(3, sysdate - 25)
*
ERROR at line 1:
ORA-01403: no data found
ORA-06512: at "OPS$ORACLE.T_AI", line 5
ORA-04088: error during execution of trigger 'OPS$ORACLE.T_AI'
SQL> UPDATE t SET id = 3 where trunc(dt) = TO_DATE('05-Sep-2009', 'dd-mon-yyyy');
UPDATE t SET id = 3 where trunc(dt) = TO_DATE('05-Sep-2009', 'dd-mon-yyyy')
*
ERROR at line 1:
ORA-01403: no data found
ORA-06512: at "OPS$ORACLE.T_AI", line 5
ORA-04088: error during execution of trigger 'OPS$ORACLE.T_AI'
John
Tags: Database
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