Question about VALIDATION and EXCEPTION loop

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  Hello

  Oracle version:  Enterprise Edition Release 11.2.0.1.0 - 64 bit

  OS :   Linux Fedora Core 17 (X86_64)

  In Chapter 11 of the PL/SQL online, here's what oracle says about The unhandled Exceptions :

  If a stored subprogram stops with an unhandled exception, PL/SQL does not restore of database changes made by the subprogramme.

  I tried the following code:

  code

  HOST clear; SET SQLBLANKLINES ALTER SESSION SET PLSQL_WARNINGS = ' ENABLE: ALL '; DROP TABLE tmptab; CREATE TABLE tmptab (n NUMBER); CREATE or REPLACE PACKAGE pkg1_pkg DEFINE AUTHID AS EXCEPTION MYEXCEPTION. PRAGMA EXCEPTION_INIT (MYEXCEPTION,-20001); END; / DISPLAY ERRORS; -It is a subroutine that exists -with an exception unhandled CREATE OR REPLACE PROCEDURE mytestProc DEFINE AUTHID IS BEGIN INSERT INTO tmptab (n) VALUES (100); -Unhandled exception does a ROLLBACK -which annuls the previous INSERT statement

  RAISE pkg1_pkg. MYEXCEPTION;

  END mytestProc;

  /

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  BEGIN

  mytestProc();

  END;

  /

  
  

  
  

  SELECT * FROM tmptab;

  And here is the result

  BEGIN * ERROR on line 1: ORA-20001: ORA-06512: at "TRAINING. MYTESTPROC', line 6 ORA-06512: at line 2 no selected line

  The fact that SELECT * FROM tmptab gives: no selected line indicates that the exception unhandled in the stored routine myTestProc is doing a ROLLBACK for the INSERT statement in the tmptab table.

  So I do not understand why in the documentation noted that no ROLLBACK is not done.

  Could someone kindly do some clarification on this?

  Thanks in advance,

  Kind regards

  Dariyoosh

  Hello

  If a stored subprogram exits with an unhandled exception, PL/SQL does not restore changes to the database made by the subprogramme.

  What is happening here, it is an anonymous block (which is not stored) stops with an unhandled exception, and who restores the uncommitted transactions.

  I created a procedure to see how many lines is in tmptab:

  CREATE OR REPLACE PROCEDURE tmptab_cnt (in_txt IN VARCHAR2)
  DEFINE AUTHID
  AS
  n PLS_INTEGER;
  BEGIN
  SELECT COUNT (*)
  N
  OF tmptab;

  dbms_output.put_line (n
  || "lines of tmptab in.
  || in_txt
  );
  END tmptab_cnt;
  /

  and called it of your procedure with your anonymous block:

  CREATE OR REPLACE PROCEDURE mytestProc
  DEFINE AUTHID
  IS
  BEGIN
  INSERT INTO tmptab (n) VALUES (100);
  tmptab_cnt ("mytestProc");

  RAISE pkg1_pkg. MYEXCEPTION;
  END mytestProc;
  /
  DISPLAY ERRORS;

  BEGIN
  mytestProc();
  EXCEPTION
  WHILE OTHERS THEN
  tmptab_cnt (anonymous"block" ");
  LIFT;
  END;
  /

  The result of this is:

  ...

  Created procedure.

  No errors.
  1 lines in tmptab in mytestProc

  
  1 lines in block anonymous tmptab
  BEGIN
  *
  ERROR on line 1:
  ORA-20001:
  ORA-06512: at line 6

  no selected line

  As you can see, there is 1 row in the table after that the procedure back to the anonymous block.

  Thanks for posting such a complete and clear test script; that really helps.

  How put you in the form code, with green background and title?

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  What I was thinking if I well Snapshots correctly is to snap turned the virtual machine before doing anything. Then do my upgrade steps and see if everything works. If its all messed up so I should be able to return to my shot and everything should be the way he had. What is the good?

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  Unhandled exceptions can also affect subroutines. If you exit a subprogram successfully, PL/SQL assigns values to parameters. However, if you come out with an unhandled exception, PL/SQL does not assign values for THE parameters (except if they are NOCOPY parameters). In addition, if a stored subprogram fails with an unhandled exception, PL/SQL does not restore database work carried out by the subprogramme of.
  
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  This only was not always true... ?

  If a subpraogram fails and generates an unhandled exception, then it is up to the calling program decide what to do with it.

  If none of the programs in the hierarchy above manipulate... then the changes are cancelled because oracle a pseudo code around the entire block similar to:

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    p1;
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  -Check this example...

  SQL> create table temp(
    2  id number);
  
  Table created.
  
  SQL> create unique index unq_id on temp(id);
  
  Index created.
  

  -If the program calling nt don't handle the error that the subprgram returns the error returned to Oracle and it cancels the entire transaction.
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    1  create or replace procedure p1(i_number in number) as
    2  begin
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    4* end;
  SQL> /
  
  Procedure created.
  
  SQL> begin
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    3     p1(1);
    4  end;
    5  /
  begin
  *
  ERROR at line 1:
  ORA-00001: unique constraint (SCOTT.UNQ_ID) violated
  ORA-06512: at "SCOTT.P1", line 3
  ORA-06512: at line 3
  
  SQL> select * from temp;
  
  no rows selected
  

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  Wrote file afiedt.buf
  
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    3    p1(1);
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  SQL> /
  
  PL/SQL procedure successfully completed.
  
  SQL>  select * from temp;
  
          ID
  ----------
           1
  

  Hope that answers your question...

  -Renon.

  Published by: Rajesh Chamarthi 18 November 2009 22:57 (added for example).

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