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From "Jayaram Subramanian (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-4633) Cache default calendar in result sets and statements on client driver
Date Tue, 08 May 2012 12:25:51 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4633?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13270399#comment-13270399

Jayaram Subramanian commented on DERBY-4633:

Thanks for reviewing Knut. I agree that in terms of performance there is no impact because
of DERBY 4582 fix. So i am going ahead and closing the issue.
> Cache default calendar in result sets and statements on client driver
> ---------------------------------------------------------------------
>                 Key: DERBY-4633
>                 URL: https://issues.apache.org/jira/browse/DERBY-4633
>             Project: Derby
>          Issue Type: Improvement
>          Components: JDBC, Network Client
>    Affects Versions:
>            Reporter: Knut Anders Hatlen
>              Labels: derby_triage10_9
>         Attachments: Main.java, Main.java
> After the changes in DERBY-4582, these methods now allocate a default calendar object
on each invocation (on the client driver), whereas they didn't before the fix:
> ResultSet.getDate(int)
> ResultSet.getTime(int)
> ResultSet.getTimestamp(int)
> PreparedStatement.setDate(int, java.sql.Date)
> PreparedStatement.setTime(int, java.sql.Time)
> PreparedStatement.setTimestamp(int, java.sql.Timestamp)
> CallableStatement.getDate(int)
> CallableStatement.getTime(int)
> CallableStatement.getTimestamp(int)
> The embedded driver prevents excessive allocation of default calendar objects in these
methods by caching an instance in ConnectionChild (the super-class of EmbedResultSet, EmbedPreparedStatement
and EmbedCallableStatement). We should do something similar on the client driver.

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