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Author What Hibernate Object ID generator is recommanded for PG?
Vernon

2005-04-21, 8:24 pm

Hi,

Here is what I have:

Java class:

public class User {

private Integer id;
....
}

Hibernate Mapping:

<class name="com.ccc.domain.User" table="users">
<id name="id" type="int" unsaved-value="null"
>

<generator class="native"/>
</id>
....
</class>

DB Table:

create table USERS (
id SERIAL UNIQUE primary key,
....
)

When I call the save(object) method of Hibernate, I
get the following exception:

2005-04-21 13:52:13,859 ERROR
org.springframework.web.servlet.DispatcherServlet -
Could not complete request
org.springframework.jdbc. BadSqlGrammarExcepti
on: Bad
SQL grammar [] in task 'Hibernate operation'; nested
exception is java.sql.SQLException: ERROR: relation
"hibernate_sequence" does not exist
java.sql.SQLException: ERROR: relation
"hibernate_sequence" does not exist
at
org.postgresql.core.v3.QueryExecutorImpl. receiveErrorResponse
(QueryExecutorImpl.java:1365)
at
org.postgresql.core.v3.QueryExecutorImpl. processResults(Query
ExecutorImpl.java:1160)
at
org.postgresql.core.v3.QueryExecutorImpl. execute(QueryExecuto
rImpl.java:172)
at
org.postgresql.jdbc2. AbstractJdbc2Stateme
nt. execute(AbstractJdbc
2Statement.java:387)
at
org.postgresql.jdbc2. AbstractJdbc2Stateme
nt. executeWithFlags(Abs
tractJdbc2Statement.java:328)
at
org.postgresql.jdbc2. AbstractJdbc2Stateme
nt. executeQuery(Abstrac
tJdbc2Statement.java:238)
at
org.apache.commons.dbcp. DelegatingPreparedSt
atement. executeQuery(Delegat
ingPreparedStatement
.java:92)
at
net.sf.hibernate.id.SequenceGenerator. generate(SequenceGen
erator.java:64)
at
net.sf.hibernate.impl.SessionImpl. saveWithGeneratedIde
ntifier(SessionImpl.java:774)
at
net.sf.hibernate.impl.SessionImpl.save(SessionImpl.java:747)
at
org.springframework.orm.hibernate. HibernateTemplate$12
. doInHibernate(Hibern
ateTemplate.java:386)
at
org.springframework.orm.hibernate.HibernateTemplate. execute(HibernateTem
plate.java:243)
at
org.springframework.orm.hibernate.HibernateTemplate. save(HibernateTempla
te.java:383)

It seems the native ID generator doesn't work properly
in PG. After changing the generator to sequence. I get
the same exception. According to the Hibernate
documentation, that is the right way. Any suggestions
on the subject?

Thanks,

Vernon

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