Hallo,
in an existing application I got an exception and tracked it down to a
generated query from the Java OR mapping solution Hibernate
Actually I was suprised that the query does not work and created a
simple use case to explain the problem (see and of this email).
The postgre SQL exception is:
ERROR: relation a does not exist
It happens when a implicit join and a inner join is mixed. Do I have to
except this as a fact or is there a logical explication for this behaviour.
--
Best Regards / Viele Grüße
Sebastian Hennebrueder
----
http://www.laliluna.de
Tutorials for JSP, JavaServer Faces, Struts, Hibernate and EJB
-- the following query has a inner join and an implicit join and does
not work.
select a.name as act_name,
u.name as trainer
from
activity a,
localgroup lg,
sponsor spon
inner join tuser u on a.fk_trainer=u.id
where spon.name='Jimmy Rich'
and
spon.fk_localgroup=lg.id
and lg.fk_activity=a.id
-- implicit join passing two tables works
select a.name as act_name
from
activity a,
localgroup lg,
sponsor spon
where spon.name='Jimmy Rich'
and
spon.fk_localgroup=lg.id
and lg.fk_activity=a.id
--
Best Regards / Viele Grüße
Sebastian Hennebrueder
----
http://www.laliluna.de
Tutorials for JSP, JavaServer Faces, Struts, Hibernate and EJB
Get support, education and consulting for these technologies - uncomplicated and cheap.
