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Date: Thu, 16 Sep 2010 10:16:35 -0400 (EDT)
From: "Kristian Waagan (JIRA)" <jira@apache.org>
To: derby-dev@db.apache.org
Subject: [jira] Commented: (DERBY-4315) Attempt to reuse streams in client
 on insert gives protocol exception and inserts wrong data
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    [ https://issues.apache.org/jira/browse/DERBY-4315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12910163#action_12910163 ] 

Kristian Waagan commented on DERBY-4315:
----------------------------------------

Note that from 10.6 (both client and server must be 10.6 or later) padded data won't be inserted into the database. This was fixed by DERBY-2017.

> Attempt to reuse streams in client on insert gives protocol exception and inserts wrong data
> --------------------------------------------------------------------------------------------
>
>                 Key: DERBY-4315
>                 URL: https://issues.apache.org/jira/browse/DERBY-4315
>             Project: Derby
>          Issue Type: Bug
>          Components: JDBC
>    Affects Versions: 10.1.3.1, 10.2.2.0, 10.3.3.0, 10.4.2.0, 10.5.1.1, 10.5.2.0, 10.6.1.0
>            Reporter: Kathey Marsden
>         Attachments: ReproReuseStream.java
>
>
> If a user attempts to reuse a stream set as a parameter to a prepared statement, the statement execution should fail with SQL State XJ001.  Instead client fails with a protocol error and inserts wrong data. See the attached java program ReproReuseStream.java for a reproduction.
> [C:/kmarsden/repro/reusestream] java ReproReuseStream
> Insert row 1
> Try to insert row 2 with reused streams
> java.sql.SQLException: Network protocol error: end of stream prematurely reached, parameter #4.  Remaining data has been
>  padded with 0x0.
>         at org.apache.derby.client.am.SQLExceptionFactory40.getSQLException(SQLExceptionFactory40.java:96)
>         at org.apache.derby.client.am.SqlException.getSQLException(SqlException.java:358)
>         at org.apache.derby.client.am.PreparedStatement.executeUpdate(PreparedStatement.java:399)
>         at ReproReuseStream.main(ReproReuseStream.java:41)
> Caused by: org.apache.derby.client.am.SqlException: Network protocol error: end of stream prematurely reached, parameter
>  #4.  Remaining data has been padded with 0x0.
>         at org.apache.derby.client.net.Request.writePlainScalarStream(Request.java:490)
>         at org.apache.derby.client.net.Request.writeScalarStream(Request.java:264)
>         at org.apache.derby.client.net.NetStatementRequest.buildEXTDTA(NetStatementRequest.java:951)
>         at org.apache.derby.client.net.NetStatementRequest.writeExecute(NetStatementRequest.java:147)
>         at org.apache.derby.client.net.NetPreparedStatement.writeExecute_(NetPreparedStatement.java:178)
>         at org.apache.derby.client.am.PreparedStatement.writeExecute(PreparedStatement.java:1801)
>         at org.apache.derby.client.am.PreparedStatement.flowExecute(PreparedStatement.java:2031)
>         at org.apache.derby.client.am.PreparedStatement.executeUpdateX(PreparedStatement.java:404)
>         at org.apache.derby.client.am.PreparedStatement.executeUpdate(PreparedStatement.java:390)
>         ... 1 more
> Go ahead and commit so we can see the wrong data.
> ID         |MNAME
>                     |MVALUE     |BYTEDATA
>                                          |CHARDATA
> ------------------------------------------------------------------------------------------------------------------------
> ------------------------------------------------------------------------------------------------------------------------
> ------------------------------------------------------------------------------------------------------------------------
> --------------------------------------------------
> 1          |mname
>                     |0          |636363636363636363636363636363636363636363636363636363636363636363636363636363636363636
> 3636363636363636363636363636363636363636&|cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc
> ccccccccccccccccccccccccccccccccccccccccccccccccc&
> 2          |mname
>                     |0          |000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
> 0000000000000000000000000000000000000000&|
>                                                  &
> To workaround the issue users should not attempt to reuse streams but we should give a better message and not insert wrong data.
> The code was extracted from StreamingColumnTest testDerby500 but the commits were removed.

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