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From "Mike Matrigali (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-6214) PreparedStatement.setObject(int, Object, Types.CLOB) fail with DerbyNet
Date Mon, 06 May 2013 18:52:15 GMT

    [ https://issues.apache.org/jira/browse/DERBY-6214?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13649980#comment-13649980
] 

Mike Matrigali commented on DERBY-6214:
---------------------------------------

wonder if the client somehow creates a clob out of the string, but that clob is not set up
to be read twice.  In the test
case multiple rows will be updated by the query, each time using the value set with setObject.

Might also be interesting to see if problem is in embedded if the string is much longer forcing
a stream.  Something bigger than 32k.
                
> PreparedStatement.setObject(int, Object, Types.CLOB) fail with DerbyNet
> -----------------------------------------------------------------------
>
>                 Key: DERBY-6214
>                 URL: https://issues.apache.org/jira/browse/DERBY-6214
>             Project: Derby
>          Issue Type: Bug
>    Affects Versions: 10.8.3.0, 10.9.1.0
>            Reporter: Rong Qu
>            Priority: Critical
>         Attachments: Derby6214.java, Derby6214_setup.sql, derby.log, DerbyNet_client_test.sql
>
>
> The issue is specific to the DerbyNet client driver, and doesn't seem to occur using
embedded Derby.
>  "PreparedStatement.setObject(int, Object, Types.CLOB)". It seems to be a problem updating
a CLOB column with a parameterized value using the DerbyNet client driver, and if the update
SQL ends up updating more than one row. I attached a simple test case that just uses JDBC
to reproduce the error. The exception looks like this:
> org.apache.derby.client.am.BatchUpdateException: Non-atomic batch failure.  The batch
was submitted, but at least one exception occurred on an individual member of the batch. Use
getNextException() to retrieve the exceptions for specific batched elements.
>     at org.apache.derby.client.am.Agent.endBatchedReadChain(Unknown Source)
>     at org.apache.derby.client.am.PreparedStatement.executeBatchRequestX(Unknown Source)
>     at org.apache.derby.client.am.PreparedStatement.executeBatchX(Unknown Source)
>     at org.apache.derby.client.am.PreparedStatement.executeBatch(Unknown Source)
>     ...
> Caused by: org.apache.derby.client.am.SqlException: Error for batch element #0: An unexpected
exception was thrown
>     at org.apache.derby.client.am.Statement.completeExecute(Unknown Source)
>     at org.apache.derby.client.net.NetStatementReply.parseEXCSQLSTTreply(Unknown Source)
>     at org.apache.derby.client.net.NetStatementReply.readExecute(Unknown Source)
>     at org.apache.derby.client.net.StatementReply.readExecute(Unknown Source)
>     at org.apache.derby.client.net.NetPreparedStatement.readExecute_(Unknown Source)
>     at org.apache.derby.client.am.PreparedStatement.readExecute(Unknown Source)
>     ... 4 more
> Caused by: org.apache.derby.client.am.SqlException: Error for batch element #0: Java
exception: 'Stream has already been read and end-of-file reached and cannot be re-used.: java.io.EOFException'.
>     at org.apache.derby.client.am.SqlException.<init>(Unknown Source)
>     at org.apache.derby.client.am.SqlException.<init>(Unknown Source)
>     ... 10 more

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