hibernate-issues

[Hibernate-issues] [Hibernate-JIRA] Created: (HHH-1794) HQL query (list) that SELECTs instances mixed with scalars returns NULLs (instance mappings are in a one-to-one relation)

[Conor T. (JIRA) <no...@at...>]

HQL query (list) that SELECTs instances mixed with scalars returns NULLs (instance mappings are in a one-to-one relation) 
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         Key: HHH-1794
         URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1794
     Project: Hibernate3
        Type: Bug

  Components: core  
    Versions: 3.1.3    
 Environment: Hibernate 3.1.3
Postgres 8.1.2
Java 1.5.0_06

    Reporter: Conor Tee
 Attachments: hibernate-scalar-problem.tar.gz

Given that "a" is a table whose id is reflected in table "b" as a PRIMARY FOREIGN KEY.
Mapping a->b and b->a with the appropriate "one-to-one" mappings (I hope), then

"select a, b from A a join a.b b"

returns "a" and "b" instances correctly..

However: (this is where I see the problem)

"select a, b, 'Some scalar' from A a join a.b b" or "select a, a.B, 'Some scalar' from A a"
returns "a" and the "scalar" correctly, but returns NULL for b!

Attached is a working example with a README, Postgres schema build script and ant "build & run" script



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[Hibernate-issues] [Hibernate-JIRA] Commented: (HHH-1794) HQL query (list) that SELECTs instances mixed with scalars returns NULLs (instance mappings are in a one-to-one relation)

[David D. (JIRA) <no...@at...>]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-1794?page=comments#action_23767 ] 

David Donn commented on HHH-1794:
---------------------------------

This issue also occurs when doing something like "select new SomeDTO(a, b) from A a join a.b b". b will always be null.

> HQL query (list) that SELECTs instances mixed with scalars returns NULLs (instance mappings are in a one-to-one relation) 
> --------------------------------------------------------------------------------------------------------------------------
>
>          Key: HHH-1794
>          URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1794
>      Project: Hibernate3
>         Type: Bug

>   Components: core
>     Versions: 3.1.3
>  Environment: Hibernate 3.1.3
> Postgres 8.1.2
> Java 1.5.0_06
>     Reporter: Conor Tee
>  Attachments: hibernate-scalar-problem.tar.gz
>
>
> Given that "a" is a table whose id is reflected in table "b" as a PRIMARY FOREIGN KEY.
> Mapping a->b and b->a with the appropriate "one-to-one" mappings (I hope), then
> "select a, b from A a join a.b b"
> returns "a" and "b" instances correctly..
> However: (this is where I see the problem)
> "select a, b, 'Some scalar' from A a join a.b b" or "select a, a.B, 'Some scalar' from A a"
> returns "a" and the "scalar" correctly, but returns NULL for b!
> Attached is a working example with a README, Postgres schema build script and ant "build & run" script

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