Question

Hi guys:
Im just studying about HQL

Could anyone explain or provide some links about different between WITH and WHERE in HQL?

fromhttp://docs.jboss.org/hibernate/core/3.3/reference/en/html/queryhql.html

example like:

from Cat as cat
left join cat.kittens as kitten
with kitten.bodyWeight > 10.0

Can I replace with with where ?

thx

Answer 1

With is used to “supply extra join conditions”, which means that it is added to the join and not to the where clause:

from Cat as cat 
  left join cat.kittens as kitten 
  with kitten.bodyWeight > 10.0

will be translated to something like this;

from Cat as cat
  left outer join Cat as kitten
    on cat.id = kitten.mother_id 
      and kitten.bodyWeight > 10.0

while this

from Cat as cat 
  left join cat.kittens as kitten 
where kitten.bodyWeight > 10.0

is translated to

from Cat as cat
  left outer join Cat as kitten
    on cat.id = kitten.mother_id 
where
  kitten.bodyWeight > 10.0