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From "Dag H. Wanvik (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5044) ALTER TABLE DROP COLUMN will not detect triggers defined on other tables with their trigger action using the column being dropped
Date Mon, 25 Jul 2011 13:51:09 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13070497#comment-13070497
] 

Dag H. Wanvik commented on DERBY-5044:
--------------------------------------

Referring to https://issues.apache.org/jira/browse/DERBY-5044?focusedCommentId=13068799&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13068799,
I think that approach looks promising. Do we always have the necessary compilation context
to regenerate the trigger actions if the triggers were defined by another user than the alter
table user? In theory that context might include a current role for the trigger definer, too...
?


> ALTER TABLE DROP COLUMN will not detect triggers defined on other tables with their trigger
action using the column being dropped
> ---------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-5044
>                 URL: https://issues.apache.org/jira/browse/DERBY-5044
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.3.3.0, 10.4.1.3, 10.4.2.0, 10.5.3.0, 10.6.2.1, 10.7.1.1, 10.8.1.2
>            Reporter: Mamta A. Satoor
>            Assignee: Mamta A. Satoor
>              Labels: derby_triage10_8
>
> A trigger in it's trigger action.can use columns from a table other than the trigger
table. When such a column is dropped, the trigger dependency does not get detected.
> A test case for this can be found in AlterTableTest.java
>         //Following test case involves two tables. The trigger is defined 
>         //on table 1 and it uses the column from table 2 in it's trigger  
>     	//action. This dependency of the trigger on a column from another 
>         //table is not detected by Derby.
>         st.executeUpdate("create table atdc_14_tab1 (a1 integer, b1 integer)");
>         st.executeUpdate("create table atdc_14_tab2 (a2 integer, b2 integer)");     
  
>         st.executeUpdate("insert into atdc_14_tab1 values(1,11)");
>         st.executeUpdate("insert into atdc_14_tab2 values(1,11)");
>         st.executeUpdate(
>                 " create trigger atdc_14_trigger_1 after update " +
>                 "on atdc_14_tab1 REFERENCING NEW AS newt " +
>                 "for each row " +
>                 "update atdc_14_tab2 set a2 = newt.a1");
>         // following is not the right behavior. we should have gotten an error
>         // because column being dropped is getting used in a trigger action 
>         st.executeUpdate("alter table atdc_14_tab2 drop column a2 restrict");
>         rs =
>                 st.executeQuery(
>                 " select triggername from sys.systriggers where " +
>                 "triggername = 'ATDC_14_TRIGGER_1' ");
>         JDBC.assertFullResultSet(rs, new String[][]{{"ATDC_14_TRIGGER_1"}});

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