About INNER JOIN

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Forum
8

Left join fetch behaviour doesn't retrieve children?

Hello, I'm a little bit confused about a left join fetch behaviour. In this test case, i try to fetch my 3 children using a left join fetch. But my collection is null after closing the em ... left join fetch         em = emf.createEntityManager();         TypedQuery query
JPA Doc
8

fetch(attribute)

Method javax.persistence.criteria.FetchParent Fetch fetch(   PluralAttribute attribute ) Create a fetch join to the specified collection-valued attribute using an inner join. Parameters: attribute - target of the join Returns: the resulting join Since: JPA 2.0
JPA Doc
8

fetch(attribute)

Method javax.persistence.criteria.FetchParent Fetch fetch(   SingularAttribute attribute ) Create a fetch join to the specified single-valued attribute using an inner join. Parameters: attribute - target of the join Returns: the resulting fetch join Since: JPA 2.0
JPA Doc
8

fetch(attributeName)

Method javax.persistence.criteria.FetchParent Fetch fetch(   String attributeName ) Create a fetch join to the specified attribute using an inner join. Parameters: attributeName - name of the attribute for the target of the join Returns: the resulting fetch join Throws
Forum
7

multiple LEFT JOINs do not work as expected

like this: SELECT DISTINCT $1 FROM Organisation $1 JOIN $1.attributeList $2 LEFT JOIN $1.parentOrg $3 LEFT JOIN $3.parentOrg $4 WHERE ((($2.name='Attribute1') AND ($2 ... , since I use LEFT Joins this query should return all organisation under the root organisation
Forum
7

How do I achieve a Deep Fetch using JOIN FETCH?

know that I can express one level of eager fetch in JPQL as follows: SELECT c FROM C JOIN FETCH c.bList WHERE c.id=:id But when I attempt to take it to the 2nd level: SELECT c FROM C JOIN FETCH c.bList JOIN FETCH c.bList.aList WHERE c.id=:id I get an error along the lines of: Invalid fetch path
Forum
7

LazyInitialization / join fetch

descrica2_2_3_ from the User usuario0_ left outer join on area area1_ usuario0_.codigo_area = area1_.codigo left outer join on User usuario2_ usuario0_.codigo_chefe = usuario2_.codigo left outer join company empresa3_ on usuario2_.codigo_empresa = empresa3_.codigo left outer join on specialty especialid4
JPA Doc
7

joinCollection(attributeName)

Method javax.persistence.criteria.From CollectionJoin joinCollection(   String attributeName ) Create an inner join to the specified Collection-valued attribute. Parameters: attributeName - name of the attribute for the target of the join Returns: the resulting join Throws
JPA Doc
7

joinList(attributeName)

Method javax.persistence.criteria.From ListJoin joinList(   String attributeName ) Create an inner join to the specified List-valued attribute. Parameters: attributeName - name of the attribute for the target of the join Returns: the resulting join Throws: IllegalArgumentException - if attribute of the given name does not exist Since: JPA 2.0
JPA Doc
7

joinMap(attributeName)

Method javax.persistence.criteria.From MapJoin joinMap(   String attributeName ) Create an inner join to the specified Map-valued attribute. Parameters: attributeName - name of the attribute for the target of the join Returns: the resulting join Throws: IllegalArgumentException - if attribute of the given name does not exist Since: JPA 2.0