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From "Fay Wang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (OPENJPA-1582) @OrderColumn(updatable=false) may have the order column field updated
Date Tue, 21 Sep 2010 17:10:32 GMT

    [ https://issues.apache.org/jira/browse/OPENJPA-1582?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12913085#action_12913085
] 

Fay Wang commented on OPENJPA-1582:
-----------------------------------

According to Section 11.1.39 of JPA 2.0 spec:

OrderColumnAnnotation Element  "updatable" means:
(Optional) Whether the column is included in SQL UPDATE statements generated by the persistence
provider

Also in the same section:
The order column must be of integral type. The persistence provider must maintain a contiguous
(non-sparse) ordering of the values of the order column when updating the association or element
collection. The order column value for the first element of the list must be 0.

Two scenarios when an element collection is updated:
(1) a new element is added:
OpenJPA will execute an insert statement
(2) an old element is removed:
OpenJPA will perform delete/insert 

For scenario (2), the operation is working as design in order to preserver the contiguous
ordering of the values of the order column. In addition, no "UPDATE" statement is issued in
this operation, which is consistent with what the spec says.

> @OrderColumn(updatable=false) may have the order column field updated
> ---------------------------------------------------------------------
>
>                 Key: OPENJPA-1582
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-1582
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: jdbc
>    Affects Versions: 2.0.0-beta2
>            Reporter: Albert Lee
>            Priority: Minor
>
> When a collection with orderColumn set updatable=false, 
>     @ElementCollection//(fetch=FetchType.EAGER)
>     @OrderColumn(updatable=false)
>     private List<String> nonUpdableAnnotatedElements;
> when collection element is updated, the order column processing performs a delete/insert
sequence. The problem is that the implicit order column field is also updated while updatable=false.

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