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: 10.3.2.1
Environment: OS: Windows, Derby 10.3.2.1, Hibernate 3.1 (same problem
with newer versions)
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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