[jira] Commented: (JDO-211) SQL Exception: 'ADPT_PK_IDX' is not a column in table or VTI 'APPLICATIONIDENTITY0.HASHMAP_OBJECT0_STR'.

["Andy Jefferson (JIRA)" <ji...@apache.org>]

    [ http://issues.apache.org/jira/browse/JDO-211?page=comments#action_12357480 ] 

Andy Jefferson commented on JDO-211:
------------------------------------

Hi Michelle,
I'm not convinced that it's a JPOX bug here. I'll explain why

Let's take the example of MapStringValueCollections, and its field "MapOfObject_String3". This is defined as
a Map field with join table and with key of SimpleClass, value of String. Both key and value are embedded, so the join table will have
* FK back to the owner table (IDENTIFIER)
* column for the value
* column(s) for the key fields
This is all well and good, but is missing one thing. JPOX needs to put a PK on the join table. What are you proposing that it uses ? It doesnt have an id for the (embedded) SimpleClass key. So it needs something else - and in this case it adds this ADPT_PK_IDX column.

Is there a field in the key class (SimpleClass) that would give uniqueness ? e.g "ID" ? In that case you should define the <primary-key> on the join table to be formed by IDENTIFIER and ID. This should be enough to stop JPOX adding its own PK adapter column (and if it doesnt prevent it then it is indeed a bug in JPOX). If there isn't a field of that nature then you have to have the ADPT_PK_IDX, or the JDO impl needs to be told somehow that it should not create a PK on the join table (which should be the last option IMHO since its a best practice to have one).

I noticed that in the TestHashSetCollections/TestSetCollections you added <order> which avoided this issue. This means that you have a HashSet/Set that can't contain duplicates (since its a Set), and a datastore representation that *can* have dups. Using a join table primary-key specification (like that above) there would have been better IMHO.

> SQL Exception: 'ADPT_PK_IDX' is not a column in table or VTI 'APPLICATIONIDENTITY0.HASHMAP_OBJECT0_STR'.
> --------------------------------------------------------------------------------------------------------
>
>          Key: JDO-211
>          URL: http://issues.apache.org/jira/browse/JDO-211
>      Project: JDO
>         Type: Bug
>   Components: tck20
>     Reporter: Michelle Caisse
>     Assignee: Andy Jefferson

>
> Test*MapStringValueCollections there is a mismatch between orm and schema.

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