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From "Evgeny Ryabitskiy (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CAY-1462) Refreshing connections in DataPool after DB restart
Date Mon, 12 Jul 2010 09:46:49 GMT

    [ https://issues.apache.org/jira/browse/CAY-1462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12887328#action_12887328
] 

Evgeny Ryabitskiy commented on CAY-1462:
----------------------------------------

Thx, for your detailed explanation! Now it's much clear.

Guess we need to make some list of "Best Practice" to explain there solutions for such common
problems.

I will try DBCP. 

One disadvantage is that there is validationQuery param that contains only one DB specific
query.
For example I can use "select 1 from dual" for Oracle but it won't work on db2 or ms sql....

Still need some wrapping to determine DB type for validation query. 

> Refreshing connections in DataPool after DB restart
> ---------------------------------------------------
>
>                 Key: CAY-1462
>                 URL: https://issues.apache.org/jira/browse/CAY-1462
>             Project: Cayenne
>          Issue Type: Improvement
>    Affects Versions: 2.0 branch, 3.0
>         Environment: MS SQL
>            Reporter: Evgeny Ryabitskiy
>            Assignee: Evgeny Ryabitskiy
>             Fix For: 2.0.5, 3.1M1
>
>
> Problem can be simulated after restart of SQL Server.
> So connection in my pool become "dead". Only thing that helps: restart my appllication.
> I wold like to have some mechanism to validate pooled connections and refresh them.
> Possible solutions:
> 1) validate before give connection from pool
> 2) asynchronous thread for validation.
> 3) Generate event for pool on such exceptions (to validate and refresh connections)
> 1- is more reliable but not sure how it will influence on performance...
> 2 - at least something... but can look like some not understandable magic... :)
> 3 - need some code investigation... 

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