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From "Daniel John Debrunner (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-525) getAsciiStreamshould replace non-ASCII characters with 0x3f, '?' to match embedded
Date Thu, 22 Sep 2005 13:10:29 GMT
    [ http://issues.apache.org/jira/browse/DERBY-525?page=comments#action_12330193 ] 

Daniel John Debrunner commented on DERBY-525:
---------------------------------------------

See this link for the justifications on why getAsciiStream() uses 8 bits and not 7.

http://db.apache.org/derby/papers/JDBCImplementation.html#GetAsciiStream%28%29

Basically, it's based upon definitions from the JDBC spec.

> getAsciiStreamshould replace non-ASCII characters with 0x3f, '?'  to match embedded
> -----------------------------------------------------------------------------------
>
>          Key: DERBY-525
>          URL: http://issues.apache.org/jira/browse/DERBY-525
>      Project: Derby
>         Type: Bug
>   Components: Network Client
>     Versions: 10.1.2.0, 10.1.1.0, 10.2.0.0
>     Reporter: Kathey Marsden
>     Assignee: Tomohito Nakayama

>
> When calling Clob.getAsciiStream or ResultSet.getAsciiStream if 
> the column type is a character type or a CLOB, then any out of 
> range character (to the ASCII set) needs to be replaced by 0x3f 
> ('?', question mark). ASCII is defined as 8 bit characters, 
> thus Unicode Characters in the range 0x0000 to 0x00ff are 
> mapped to ASCII characters 0x00 to 0xff, and Unicode characters 
> in the range 0x0100 to 0xffff are mapped to 0x3f
> By code inspection:
> client code in 
> org.apache.derby.client.am.ResultSet
> embedded in 
> org.apache.derby.impl.jdbc.ReaderToAscii

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