[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-6944) Update Dialects to return SQLExceptionConversionDelegate

[Steve Ebersole (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-6944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=44992#comment-44992 ] 

Steve Ebersole commented on HHH-6944:
-------------------------------------

Or maybe we leave {{org.hibernate.dialect.Dialect#buildSQLExceptionConverter}} in place and just add {{org.hibernate.dialect.Dialect#buildSQLExceptionConversionDelegate}}, converting our implementations from the former to the latter.

The idea of {{org.hibernate.dialect.Dialect#buildSQLExceptionConverter}} would be that if the dialect returned any non-null value, we would use that without any other delegation.

> Update Dialects to return SQLExceptionConversionDelegate
> --------------------------------------------------------
>
>                 Key: HHH-6944
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-6944
>             Project: Hibernate Core
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 4.0.1
>            Reporter: Steve Ebersole
>            Assignee: Hardy Ferentschik
>             Fix For: 4.1.0
>
>
> Currently dialects return a {{SQLExceptionConversion}} which takes on full responsibility for conversion.  I added {{SQLExceptionConversionDelegate}} to support a more collaborative/chained approach.  The idea is that eventually we would have just a single {{SQLExceptionConversion}} (or maybe it becomes a class instead of interface) that contains multiple {{SQLExceptionConversionDelegate}} instances to which it would delegate.
> The {{SQLExceptionConversionDelegate}} instances would be determined from:
> # a "static" one based on the JDBC 4 defined {{SQLException}} hierarchy
> # one for SQLState codes for either X/Open or SQL-2003 codes, depending on {{java.sql.DatabaseMetaData#getSQLStateType}}
> # vendor specific error code or SQLState interpretations via Dialect

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