| "Repeated column in mapping for entity" [message #70201] |
Fri, 02 February 2007 11:03  |
Eclipse User |
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I have a class which has to inheritance paths to one of its
superclasses. When throwing this class at Teneo/Hibernate, Hibernate(? I
guess...) complains about
"Repeated column in mapping for entity:
rel.datatypes.RelationalTimestamp column: subsecondprecision (should be
mapped with insert="false" update="false"
Apparently, it is bothered by the field subsecondprecision, perhaps
assuming it has the same field twice. Renaming the property did not help
(it would complain about the column with the new name).
I am not sure what actually happens if I set insertable and updatable to
false as the error message suggests... the error message disappears, but
since my attempt at renaming apparently applied to "both" properties
(which are one and the same thing, but not for hibernate), might these
settings not result in not being able to store this property at all?
Regards
Jürgen
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| Re: "Repeated column in mapping for entity" [message #70225 is a reply to message #70201] |
Fri, 02 February 2007 11:25  |
| Eclipse User |
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Hibernate does not support multiple inheritance. Teneo tries to overcome this missing feature but
the approach has limitations:
http://www.elver.org/hibernate/inheritance.html#Multiple+Inh eritance+Support
The 'trick' Teneo uses to support multiple inheritance is that it takes the first supertype as the
real superclass and considers the other inheritance tree as a mapped-superclass (copies the
properties to the subclass in the hibernate mapping). This results in two columns with the same name
in your case. Then if you use single_table inheritance these columns are placed in the same table
and a clash occurs. Teneo can do this better (check if a feature is already covered by the first
supertype). Can you enter a bugzilla for this?
For now to get you going the 'solution' is to use joined as the inheritance strategy.
gr. Martin
JG wrote:
> I have a class which has to inheritance paths to one of its
> superclasses. When throwing this class at Teneo/Hibernate, Hibernate(? I
> guess...) complains about
>
> "Repeated column in mapping for entity:
> rel.datatypes.RelationalTimestamp column: subsecondprecision (should be
> mapped with insert="false" update="false"
>
> Apparently, it is bothered by the field subsecondprecision, perhaps
> assuming it has the same field twice. Renaming the property did not help
> (it would complain about the column with the new name).
> I am not sure what actually happens if I set insertable and updatable to
> false as the error message suggests... the error message disappears, but
> since my attempt at renaming apparently applied to "both" properties
> (which are one and the same thing, but not for hibernate), might these
> settings not result in not being able to store this property at all?
>
> Regards
>
> Jürgen
--
With Regards, Martin Taal
Springsite/Elver.org
Office: Hardwareweg 4, 3821 BV Amersfoort
Postal: Nassaulaan 7, 3941 EC Doorn
The Netherlands
Tel: +31 (0)84 420 2397
Fax: +31 (0)84 225 9307
Mail: mtaal@springsite.com - mtaal@elver.org
Web: www.springsite.com - www.elver.org
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| Re: "Repeated column in mapping for entity" [message #602061 is a reply to message #70201] |
Fri, 02 February 2007 11:25 |
| Eclipse User |
|
|
|
Hibernate does not support multiple inheritance. Teneo tries to overcome this missing feature but
the approach has limitations:
http://www.elver.org/hibernate/inheritance.html#Multiple+Inh eritance+Support
The 'trick' Teneo uses to support multiple inheritance is that it takes the first supertype as the
real superclass and considers the other inheritance tree as a mapped-superclass (copies the
properties to the subclass in the hibernate mapping). This results in two columns with the same name
in your case. Then if you use single_table inheritance these columns are placed in the same table
and a clash occurs. Teneo can do this better (check if a feature is already covered by the first
supertype). Can you enter a bugzilla for this?
For now to get you going the 'solution' is to use joined as the inheritance strategy.
gr. Martin
JG wrote:
> I have a class which has to inheritance paths to one of its
> superclasses. When throwing this class at Teneo/Hibernate, Hibernate(? I
> guess...) complains about
>
> "Repeated column in mapping for entity:
> rel.datatypes.RelationalTimestamp column: subsecondprecision (should be
> mapped with insert="false" update="false"
>
> Apparently, it is bothered by the field subsecondprecision, perhaps
> assuming it has the same field twice. Renaming the property did not help
> (it would complain about the column with the new name).
> I am not sure what actually happens if I set insertable and updatable to
> false as the error message suggests... the error message disappears, but
> since my attempt at renaming apparently applied to "both" properties
> (which are one and the same thing, but not for hibernate), might these
> settings not result in not being able to store this property at all?
>
> Regards
>
> Jürgen
--
With Regards, Martin Taal
Springsite/Elver.org
Office: Hardwareweg 4, 3821 BV Amersfoort
Postal: Nassaulaan 7, 3941 EC Doorn
The Netherlands
Tel: +31 (0)84 420 2397
Fax: +31 (0)84 225 9307
Mail: mtaal@springsite.com - mtaal@elver.org
Web: www.springsite.com - www.elver.org
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