[teiid-issues] [JBoss JIRA] (TEIID-5763) GENERATED_KEY returns NULL if used in INSTEAD OF INSERT Triggers in DDL files

[Christoph John (Jira)]

    [ https://issues.jboss.org/browse/TEIID-5763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13748037#comment-13748037 ] 

Christoph John commented on TEIID-5763:
---------------------------------------

Hello Steven,
great. But I do have one further question regarding the key variable. Does it always represent the key value of the table on which the last insert was done? I mean, in case I have multiple inserts in an insert trigger on different tables, is then the key variable always associated with the record on the table of the last insert?

for example:

CREATE FOREIGN TABLE tableA(integer ,k integer not null auto_increment primary key);
CREATE FOREIGN TABLE tableB(integer ,k integer not null auto_increment primary key)
CREATE FOREIGN TABLE tableC(integer ,k integer not null auto_increment primary key)

create view v1 (i integer, k integer not null auto_increment primary key)
OPTIONS (UPDATABLE true) as
   select x, y from tableC;

create trigger on v1 instead of insert as
   for each row begin atomic
      insert into tableA (x) values (new.i);
      --key.k references tableA.k?
      insert into tableB (x) values (new.i);
      --key.k references tableB.k?
     insert into tableC (x) values(new.i);
     --key.k references tableC.k?


> GENERATED_KEY returns NULL if used in INSTEAD OF INSERT Triggers in DDL files
> -----------------------------------------------------------------------------
>
>                 Key: TEIID-5763
>                 URL: https://issues.jboss.org/browse/TEIID-5763
>             Project: Teiid
>          Issue Type: Bug
>    Affects Versions: 12.2
>            Reporter: Christoph John
>            Assignee: Steven Hawkins
>            Priority: Blocker
>
> The issue arrised in:
> https://developer.jboss.org/message/989700#989700
> Following sceanarios are  given:
> Variant 1:
> Table Product(id), primary key = autoincrement;
> Table QuicklyAddedProduct, primary key is foreign key on Product.id
> Table Diary_SRC
> View Diary on Diary_SRC
> INSTEAD OF INSERT Trigger on Diary should :
> -create new record on Product, 
> -get autoincremented Product.id of new record,
> - create new QuicklyAddedProduct with returned Product.id as primary key
> - create new Diary record with QuicklyAddedProduct 
> {
>    INSERT a new record on Product;
>    idProduct = CONVERT(GENERATED_KEY('idProduct'),long); // fails
> }
> Variant 2:
> INSTEAD OF INSERT trigger on Diary should :
> - create new QuicklyAddedProduct 
> - add Quickly added prodcut to Diary
> additionally a INSTEAD OF trigger on QuicklyAddedProduct exists which:
> - creates new Product record
> - uses returned GENERATED_KEY(Product.id) to add record on QuicklyAddedProduct with Product.id as primary key



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