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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-1599) Clob.getSubString() throws NullPointerException when created by updatable result set
Date Fri, 02 Nov 2007 10:38:50 GMT

    [ https://issues.apache.org/jira/browse/DERBY-1599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12539562
] 

Kristian Waagan commented on DERBY-1599:
----------------------------------------

It is not clear to me why getCharacterStream and updateCharacterStream count as two read operations
on a column.
>From a users point of view, I'm updating the column, reading it back (for some reason...)
and then finally performing the update (updateRow, not commit). This fails in trunk for stream,
but I assume it works for primitives?

The other way around (equals what Dan asked in the previous comment), I read the current column
value, supply new data and tell Derby to update the row. I believe this works in trunk?

To be able to implement something that is consistent and robust, I think we have to investigate
and specify what exactly is allowed.

> Clob.getSubString() throws NullPointerException when created by updatable result set
> ------------------------------------------------------------------------------------
>
>                 Key: DERBY-1599
>                 URL: https://issues.apache.org/jira/browse/DERBY-1599
>             Project: Derby
>          Issue Type: Bug
>          Components: JDBC, Network Client
>    Affects Versions: 10.1.3.1, 10.2.1.6
>            Reporter: Knut Anders Hatlen
>            Priority: Minor
>         Attachments: Repro.java
>
>
> If you create a clob value with one of the ResultSet.updateXXX methods that take a stream
or a reader, and retrieve that value with ResultSet.getClob(), a NullPointerException will
be thrown when getSubString() is called on the returned Clob object. This happens with the
network client driver, and it has been observed on Derby 10.1.3.1 and trunk.
> Exception in thread "main" java.lang.NullPointerException
>         at org.apache.derby.client.am.Clob.getSubStringX(Clob.java:229)
>         at org.apache.derby.client.am.Clob.getSubString(Clob.java:210)
>         at Repro.main(Repro.java:24)

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