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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3173) Removed cached String objects from SQLDate, SQLTime and SQLTimestamp
Date Wed, 21 Jul 2010 18:04:51 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3173?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12890800#action_12890800
] 

Knut Anders Hatlen commented on DERBY-3173:
-------------------------------------------

Dan wrote:

> 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.

This part of the issue sounds like the problem that caused DERBY-3856,
which has later been fixed.

> 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
>
> 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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