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Gail Badner resolved HHH-5114.
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Assignee: Gail Badner
Resolution: Duplicate
Column 'timestamp' in field list is ambiguous
---------------------------------------------
Key: HHH-5114
URL:
http://opensource.atlassian.com/projects/hibernate/browse/HHH-5114
Project: Hibernate Core
Issue Type: Bug
Affects Versions: 3.5.0-Final
Environment: MySQL 5.1.45, MySQL5InnoDBDialect
Reporter: ChB
Assignee: Gail Badner
I ran into the following error today: 'Column 'timestamp' in field list is
ambiguous'
So i tried to figure out what is causing this. I have the following mapping (
public class X
@OneToOne(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "y")
@org.hibernate.annotations.Fetch(FetchMode.JOIN)
public Y getY() {
return this.y;
}
}
public class Y
@OneToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "x_id", unique = true, nullable = false, insertable =
false, updatable = false)
public X getX() {
return this.x;
}
}
and had the following Query "select x from X as y ..." which resulted in
select
bla0_.x_id as x_id1_5_4_,
bla0_.xyz as xyz2_5_4_,
timestamp as timestamp5_4_,
foo1_.id as id3_0_,
...
bla4_.x_id as x_id1_5_3_,
bla4_.xyz as xyz2_5_3_,
timestamp as timestamp5_3_
from Y bla0_
left outer join X foo1_ on bla0_.x_id=foo1_.id
...
left outer join Y bla4_ on foo1_.id=bla4_.x_id
As you can obviously see this is a combination of 2 bugs:
1.) The text 'bla0_.' is missing prior to 'timestamp' (first occurence)
and 'bla4_.' is missing prior to 'timestamp' (next occurence)
2.) For no reason the table Y is loaded twice from the DB (as bla0_ and bla4_)
This might be dialect specific, I'm using MySQL5InnoDBDialect.
I could work around this by removing
"(a)org.hibernate.annotations.Fetch(FetchMode.JOIN)", but thats not a real
solution. This did not happend with hibernate 3.3.
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