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From "Dag H. Wanvik (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (DERBY-2540) Restructure code for Blob/Clob length in client to prepare for locator implementation
Date Wed, 18 Apr 2007 16:20:17 GMT

     [ https://issues.apache.org/jira/browse/DERBY-2540?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Dag H. Wanvik resolved DERBY-2540.
----------------------------------

    Resolution: Fixed

> Restructure code for Blob/Clob length in client to prepare for locator implementation
> -------------------------------------------------------------------------------------
>
>                 Key: DERBY-2540
>                 URL: https://issues.apache.org/jira/browse/DERBY-2540
>             Project: Derby
>          Issue Type: Sub-task
>          Components: Network Client
>            Reporter: Øystein Grøvlen
>         Assigned To: Øystein Grøvlen
>             Fix For: 10.3.0.0
>
>         Attachments: derby-2540.diff, derby-2540.stat, derby-2540_2.diff
>
>
> In order to prepare for the locator-based implementation, I want to restructure the code
for getting the length of LOBs. 
> Currently, the LOB class has a protected field sqlLength_ that will contain the length
of the LOB, if known.  Currently, it is always known as long as the LOB has been materialized.
 However, when locators are introduced, the length may have to be fetched from the server
the first time it is needed.   With the current implementation, where sqlLength_ is accessed
directly by many classes in the package, it will become very difficult to keep track of whether
one needs to fetch the length from the server or not.
> I will change the implementation to make Lob.sqlLength_ private and add access methods
to get and set its value.  (A good thing in itself IMHO).  If the length is unknown, the LOB
will be materialized to get the length. 

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