[ 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. -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://issues.apache.org/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira
