JPA Criteria : LEFT JOIN with an AND condition

Question

Hi all,
I have a question regarding JPA criteria.
Here is my JPA query :
CriteriaBuilder criteriaBuilder = em.getCriteriaBuilder();
CriteriaQuery<Long> criteriaQuery = criteriaBuilder.createQuery(Long.class);
Root<Email> emailRoot = criteriaQuery.from(Email.class);
criteriaQuery.distinct(true);
Predicate globalCondition = criteriaBuilder.equal(emailRoot.get(Email_.type), EmailType.in);
Predicate responseMandatoryCondition = criteriaBuilder.equal(emailRoot.get(Email_.responseMandatory), true);
Predicate typeCondition = criteriaBuilder.notEqual(emailRoot.join(Email_.emailsOut, JoinType.LEFT).get(Email_.responseType),ResponseType.response);
globalCondition = criteriaBuilder.and(globalCondition, responseMandatoryCondition);
globalCondition = criteriaBuilder.and(globalCondition, typeCondition);
em.createQuery(mainCriteria.where(globalCondition)).getSingleResult();
Here is the result of this query :
SELECT DISTINCT email0_.ID AS col_0_0_
FROM EMAIL email0_
LEFT OUTER JOIN email emailso1_ ON email0_.ID = emailso1_.ID_EMAIL_IN
WHERE email0_.TYPE = 'in'
AND email0_.RESPONSE_MANDATORY = true
AND emailso1_.RESPONSE_TYPE <> 'response'
LIMIT 0 , 30
And here is the request I needed :
SELECT DISTINCT email0_.ID AS col_0_0_
FROM EMAIL email0_
LEFT OUTER JOIN email emailso1_ ON email0_.ID = emailso1_.ID_EMAIL_IN AND emailso1_.RESPONSE_TYPE <> 'response'
WHERE email0_.TYPE = 'in'
AND email0_.RESPONSE_MANDATORY = true
LIMIT 0 , 30
As you can see I need to check if the RESPONSE_TYPE is equals on the same line that the LEFT OUTER JOIN. Does anybody know how to write such an JPA criteria query ?
Thanks ,
Louis
Edited by: user13105928 on 17 févr. 2011 03:06

Answer 1

You cannot define an ON clause with Criteria, nor JPQL.
Perhaps you can reword the query to avoid needing an ON clause.
What is the query you want to do (in english)?
Can you just use an OR in the where clause?
There is a enhancement request to have ON clause support added, please vote for it.
https://bugs.eclipse.org/bugs/show_bug.cgi?id=312146
James : http://www.eclipselink.org