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From "Suresh Thalamati (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-2247) provide set methods for blob in embeded driver
Date Tue, 13 Mar 2007 19:05:09 GMT

    [ https://issues.apache.org/jira/browse/DERBY-2247?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12480521
] 

Suresh Thalamati commented on DERBY-2247:
-----------------------------------------

While doing some testing I ran into the LOBStreamControl.java in 
the stack. Couple of minor questions.  
 
1) LOBStreamControl.java : isValidPostion() 
   if (pos > tmpFile.length())
         throw Util.generateCsSQLException(
           SQLState.BLOB_POSITION_TOO_LARGE, new Long(pos + 1));


isValidPosition() is called on most of the read/write.  I think calling  
a file length call can be expensive for each read/write call. 

 
2) Are blobs written to temp files for some special cases ? 
I was just using BaseJdbcTestCase.java: assertEquals(Blob b1, Blob b2) 
method in my test. It was triggering the writes to temp 
file through  LOBStreamControl.java ,  is this expected ?

> provide set methods for blob in embeded driver
> ----------------------------------------------
>
>                 Key: DERBY-2247
>                 URL: https://issues.apache.org/jira/browse/DERBY-2247
>             Project: Derby
>          Issue Type: Sub-task
>          Components: JDBC
>         Environment: all
>            Reporter: Anurag Shekhar
>         Assigned To: Anurag Shekhar
>            Priority: Minor
>         Attachments: derby-2247-followup.diff, derby-2247-v3-usingStoreFactory.diff,
derby-2247-v4-usingStoreFactory.diff, derby-2247.diff, derby-2247v2-using_StoreFactory.diff
>
>


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