39 | JPQL JOIN FETCH ErrorHello I get an error when executing the following JPQL query: select doi from Doi doi left join fetch doi.metadata metadata left join fetch metadata.titles titles left join fetch metadata.creators creators left join fetch metadata.descriptions descriptions left join fetch metadata |
37 | 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<MyEntity> query |
33 | 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 |
7 | joinSet(attributeName)Method javax.persistence.criteria.From SetJoin<X,Y> joinSet( String attributeName ) Create an inner join to the specified Set-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 |
7 | joinList(attributeName)Method javax.persistence.criteria.From ListJoin<X,Y> 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 |
7 | joinMap(attributeName)Method javax.persistence.criteria.From MapJoin<X,K,V> 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 |
7 | joinCollection(attributeName)Method javax.persistence.criteria.From CollectionJoin<X,Y> 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 |
7 | Posting Sample Code. Whenever possible: Use a single Java file with one main class + static inner classes for entity |
7 | Criteria Query From Elements (bound by an entity class) are represented by the Root subinterface: Join variables (bound by an attribute of a preceding variable in the FROM clause) are represented by the Join subinterface and its descendant interfaces: See the FROM in Criteria Queries section for more details and examples. Join |
0 | [ODB1] Chapter 3 - Persistent Classes class), interface implementations, inner classes, etc. The class members (constructors, methods |
