[jira] [Closed] (ISIS-788) Delete the Isis Blob/Clob Converter classes for JDO, since redundant.

["Dan Haywood (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ISIS-788?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dan Haywood closed ISIS-788.
----------------------------


> Delete the Isis Blob/Clob Converter classes for JDO, since redundant.
> ---------------------------------------------------------------------
>
>                 Key: ISIS-788
>                 URL: https://issues.apache.org/jira/browse/ISIS-788
>             Project: Isis
>          Issue Type: Improvement
>          Components: Objectstore: JDO
>    Affects Versions: objectstore-jdo-1.4.1
>            Reporter: Dan Haywood
>            Assignee: Dan Haywood
>            Priority: Trivial
>             Fix For: objectstore-jdo-1.5.0
>
>
> As per query to Andy Jefferson:
> > I also implemented the TypeConverter interface for Blob and Clob;
> > but I'm not sure how DN actually uses it.  Can you enlighten me?
> If the user has specified to use a TypeConverter on a field
> http://www.datanucleus.org/products/accessplatform/jdo/types.html#typeconverter
> then it will select TypeConverterMapping for that field (the log should say).
> This has the TypeConverter internally, and will handle creation of the
> required column (for the datastore type of the converter), and automate the getObject/setObject of the XXXMapping that you would have had to write if you had written the Mapping class manually.
> https://github.com/datanucleus/datanucleus-rdbms/blob/3.2/src/java/org/datanucleus/store/rdbms/mapping/java/TypeConverterMapping.java
> On a persist, the setObject is called, passing through the converter. On a
> fetch the getObject is called, passing through the converter.
> In DN 4.0, there is even less need to provide the XXXMapping classes,  adding on TypeConverterMultiMapping so for cases like your multi-column Blob it may be possible to do it just via a (different) converter (with multiple columns).



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