[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-2507) Support for CLOB not working for DB2 when table per concrete class is being used
Andreas Münch (JIRA)
noreply at atlassian.com
Fri Jul 31 10:17:14 EDT 2009
[ http://opensource.atlassian.com/projects/hibernate/browse/HHH-2507?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=33685#action_33685 ]
Andreas Münch commented on HHH-2507:
------------------------------------
Generally I found this approach usefull for DerbyDialect, a subclass of DB2Dialect:
public String getSelectClauseNullString(int p_sqlType)
{
return "CAST(NULL AS " + getTypeName(p_sqlType, 1, 1, 1) + ")";
}
> Support for CLOB not working for DB2 when table per concrete class is being used
> --------------------------------------------------------------------------------
>
> Key: HHH-2507
> URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2507
> Project: Hibernate Core
> Issue Type: Bug
> Affects Versions: 3.2.2
> Reporter: breako
>
> Hi,
> This came up in the forums:
> http://forum.hibernate.org/viewtopic.php?p=2344008#2344008
> Sample code: Two Pojos
> @Entity
> public class Person {
> private int i;
> @Identity
> public int getI() {
> return i;
> }
> public void setI(int i){
> this.i = i;
> }
> }
> @Entity
> public class Employee extends Person{
> @Basic(fetch=FetchType.LAZY)
> @Lob
> public String getClobAttr() {
> return clobAttr;
> }
>
> public void setClobAttr(String clobAttr) {
> this.clobAttr = clobAttr;
> }
> }
> Simple test:
> public static void main (String args[]) {
> Query queryImpl = em.createQuery(" from Person");
> List list = queryImpl.getResultList();
> }
> This will generate SQL
> select person0_.clobAttr as clobAttr1 from (select nullif(0,0) as clobAttr from TPerson union all select clobAttr from TEmployee) person0_
> which chucks the exception:
> DB2 SQL error: SQLCODE: -415, SQLSTATE: 42825, SQLERRMC: null
> I think the SQL hibernate should generate should be:
> select person0_.clobAttr as clobAttr1 from (select cast(null as CLOB) as clobAttr from TPerson union all select clobAttr from TEmployee) person0_
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