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From "Thomas Nielsen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3621) Hibernate. Derby uses type 'text' as clob(255) instead of long varchar
Date Tue, 15 Apr 2008 18:35:09 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12589183#action_12589183

Thomas Nielsen commented on DERBY-3621:

Based on your original email[1] to derby-user earlier today, as well as the current description
and synopsis, I believe this is not a Derby issue.

The mapping from Hibernate 'text' type to Derby 'clob' type happens in the Hibernate dialects
code which is part of Hibernate, not Derby.
If there is an issue in this area it should be filed with the Hibernate community.

[1] http://www.nabble.com/derby---hibernate---type-%27text%27-to16692245.html#a16692245

> Hibernate. Derby uses type 'text' as clob(255) instead of long varchar
> ----------------------------------------------------------------------
>                 Key: DERBY-3621
>                 URL: https://issues.apache.org/jira/browse/DERBY-3621
>             Project: Derby
>          Issue Type: Bug
>    Affects Versions:
>         Environment: OS: Windows, Derby, Hibernate 3.1 (same problem with newer
>            Reporter: Aleksander Rozman
> Hi !
> It seems that when type 'text' is used with Hibernate (indicating type text in database,
which is varchar with no length defined-unlimited) Derby converts this definition to CLOB(255).

> --------- Original code is set to 
> 		registerColumnType( Types.CLOB, "clob($l)" );
> This then procudes CLOB(255), which means that Derby gives it only 255 character. Even
if we dont use long varchar and use clob, we should at least give it max value for derby (this
would fix most of problems, except in case where entry could be long varchar).
> --------- This is my hack (which doesn't work)
> I tried to "hack" hibernate and added following definition into DerbyDialect...
>         registerColumnType(Types.LONGVARBINARY, "long varchar for bit data");
>         registerColumnType(Types.LONGVARCHAR, "long varchar");
>         registerColumnType(Types.CLOB, "long varchar");
> When I use type='text', then it always falls into Type.CLOB. This hack made it to be
long varchar, which then produced error....
> Caused by: java.sql.SQLDataException: An attempt was made to get a data value of type
'LONG VARCHAR' from a data value of type 'CLOB'.
> 	at org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(Unknown Source)
> 	at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Unknown Source)
> 	at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Unknown Source)
> 	at org.apache.derby.impl.jdbc.Util.generateCsSQLException(Unknown Source)
> 	at org.apache.derby.impl.jdbc.EmbedConnection.newSQLException(Unknown Source)
> 	at org.apache.derby.impl.jdbc.ConnectionChild.newSQLException(Unknown Source)
> 	at org.apache.derby.impl.jdbc.EmbedPreparedStatement.dataTypeConversion(Unknown Source)
> 	at org.apache.derby.impl.jdbc.EmbedPreparedStatement.setNull(Unknown Source)
> 	at org.hibernate.type.NullableType.nullSafeSet(NullableType.java:76)
> 	at org.hibernate.type.NullableType.nullSafeSet(NullableType.java:60)
> 	at org.hibernate.persister.entity.AbstractEntityPersister.dehydrate(AbstractEntityPersister.java:1826)
> 	at org.hibernate.persister.entity.AbstractEntityPersister.dehydrate(AbstractEntityPersister.java:1803)
> 	at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2059)
> ------------------
> Any kind of fix would be helpful. I am trying to find *any* pure java database that works
with Hibernate... Each have their own problems... Hsqldb is to slow when used on USB (it works
very fast, but shutdown is problem), Mckoi works very slow, but shgutdown is fast, this one
doesn't work... Problem is that I need to have "portable" database, since my application should
be also used on USB disk....
> I hope this will be resolved...

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