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https://issues.apache.org/jira/browse/DERBY-3173?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Knut Anders Hatlen updated DERBY-3173:
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Attachment: sqldate.diff
Hi Eranda,
Thanks for posting the patch. Your changes look good to me. I'm running the
regression tests now and intend to commit it if the tests run cleanly. Before
starting the tests, I made two minor changes to your patch (see the attached
sqldate.diff): 1) Removed trailing blanks. 2) Narrowed the scope of the local
variable valueString in getString() since it's only used inside the first
branch of the if statement.
> Removed cached String objects from SQLDate, SQLTime and SQLTimestamp
> --------------------------------------------------------------------
>
> Key: DERBY-3173
> URL: https://issues.apache.org/jira/browse/DERBY-3173
> Project: Derby
> Issue Type: Improvement
> Components: SQL
> Reporter: Daniel John Debrunner
> Priority: Minor
> Attachments: Derby-3173.diff, sqldate.diff
>
>
> These type classes save a copy of the value when it is converted to a String
> (e.g. through a ResultSet.getString()). This complicates the code & increases
> memory use for little value, in most cases the cached value will never be
> used. E.g. for any type of scan the String value will be discarded when
> moving to the next row. In most cases applications do not call getString()
> twice on a column.
> The code has some historical basis in the fact that these types used to be
> represented by a java.sql.Time/Date/Timestamp object and its conversion to
> String was slow. Now the conversion of all these types to a String is simple.
> In addition I think the getString() will sometimes return a non-normalized
> form, if the value is set by a non-standard format then the cached String is
> set to the non-standard format, not the standard format, I believe this is
> incorrect.
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