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From "Kathey Marsden (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-1652) Update trigger updating the same rows as the original update does not throw an exception ERROR 54038: "Maximum depth of nested triggers was exceeded" as it should
Date Mon, 07 Aug 2006 14:46:14 GMT
    [ http://issues.apache.org/jira/browse/DERBY-1652?page=comments#action_12426240 ] 
            
Kathey Marsden commented on DERBY-1652:
---------------------------------------

Dan asked:
>Does the comment "However, If the derby jars are >updated to a new version" mean that
the bug is fixed in >the new version and so thiis bug is already fixed. 

No if you create this trigger in the latest 10.2 you will see that when it fires it does not
give an exception.

It is changing versions that  triggers the trigger to start giving the  exception.  So for
instance if you create the trigger in 10.1.3.1,   it would fire without error until you moved
to  10.1.3.2.  Then you would start seeing the exception when the trigger fires.  This is
why I am concerned about user impact with this issue.   The incorrect  trigger will operate
as the user might think it would until they upgrade and then  boom, their application works
no more.






> Update trigger updating the same rows as the original update does not  throw an exception
ERROR 54038: "Maximum depth of nested triggers was exceeded" as it should
> -------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-1652
>                 URL: http://issues.apache.org/jira/browse/DERBY-1652
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.0.2.0
>            Reporter: Kathey Marsden
>         Assigned To: Yip Ng
>             Fix For: 10.1.3.2
>
>
> Execution  of  an update trigger that updates the same row  as the original update will
 recurse forever and exceed the maximum nesting level of 16 so should throw the exception:
> ERROR 54038: "Maximum depth of nested triggers was exceeded"
> However, it  does not always throw the exception.   For example:
> CREATE TABLE "TEST" (                                           
>       
>  "TESTID" INTEGER NOT NULL GENERATED ALWAYS AS IDENTITY (START 
>  WITH 1,
>  INCREMENT BY 1),                                                
>       
>  "INFO" INTEGER NOT NULL,                                        
>       
>  "TIMESTAMP" TIMESTAMP NOT NULL DEFAULT 
>  '1980-01-01-00.00.00.000000'  
>  );                                                              
>       
>  CREATE TRIGGER UPDATE_TEST                            
>   AFTER UPDATE ON TEST                                 
>   REFERENCING OLD AS OLD                               
>   FOR EACH ROW MODE DB2SQL                             
>   UPDATE TEST SET TIMESTAMP = CURRENT_TIMESTAMP WHERE  
>   TESTID = OLD.TESTID;                                 
>  INSERT INTO TEST (INFO) VALUES  
>  (1),                            
>  (2),                            
>  (3); 
>  UPDATE TEST SET INFO = 1 WHERE TESTID = 2; 
> Does not throw an exception:
> However, If the derby jars are updated to a new version, the correct exception is thrown.
>  Replace derby jars with  new version
>  Execute the following in ij:
>  UPDATE TEST SET INFO = 1 WHERE TESTID = 2; 
>  ERROR 54038: Maximum depth of nested triggers was exceeded.
> Note: This issue stemmed from the Invalid issue,  DERBY-1603, because a user hit the
exception after upgrade and thought the exception after upgrade, not the lack of exception
before upgrade was the problem. This may be a common user error, so  we need a release note
to help mitigate the issue.    I will add one shortly after confirming the correct trigger
syntax. 

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