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From "Tomohito Nakayama (JIRA)" <derby-...@db.apache.org>
Subject [jira] Updated: (DERBY-609) Returning ByteArrayInputStream from ResultSet is not appropriate
Date Sat, 15 Oct 2005 14:56:45 GMT
     [ http://issues.apache.org/jira/browse/DERBY-609?page=all ]

Tomohito Nakayama updated DERBY-609:
------------------------------------

    Attachment: DERBY-609.patch

I submit patch for DERBY-609 .

Description :
   * Modification to client
   Now ResultSet returrn InputStream as CloseFilterInputStream filtering original InputStream.
   CloseFilterInputStream serve functionality to be closed , even if close method of filtered
InputStream have no effect .
   ResultSet close CloseFilterInputStream when getXXXX method was called .

   * Modification to test 
   Include jdbc/resultsetStream.java in DerbyNetClient suite .   

Test :
   executed derbyall and found no error .   

> Returning ByteArrayInputStream from ResultSet is not appropriate
> ----------------------------------------------------------------
>
>          Key: DERBY-609
>          URL: http://issues.apache.org/jira/browse/DERBY-609
>      Project: Derby
>         Type: Bug
>   Components: Network Client
>     Reporter: Tomohito Nakayama
>     Assignee: Tomohito Nakayama
>  Attachments: DERBY-609.patch
>
> Point where it is not appropriate :
> 1: Compatibility
> The InputStream returned from result set is closed when other getXXXX method was called
.
> http://java.sun.com/j2se/1.5.0/docs/api/java/sql/ResultSet.html
> However closing ByteArrayInputStream have no effect at all .
> http://java.sun.com/j2se/1.5.0/docs/api/java/io/ByteArrayInputStream.html#close()
> It seems intended that closable InputStream was returned from result set .
> If ByteArrayInputStream was returned from result set , the stream cannot be closed, 
> and compatibility would be lost .
> 2: Performance of program 
> Information inputted from ByteArrayInputStream needs to be expanded to memory as byte[]
object .
> If large byte[] object was created for each ByteArrayInputStream object , 
> program will run in bad performance .
> // I think problem is when information typed as LOB was retrieved from ResultSet .
> // Because such informations typed as LOB tend to be large amount .

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