About attribute

forum_thread

Left join fetch behaviour doesn't retrieve children?

Hello support, 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. It was expected to be fetched before closing the em, no ? In fact, that is the objective of the fetch purpose (i guess ?). ... Another strange bug ... I just added an attribute with mappedBy to the parent. This just break the test ... Note that i don't create any entity on that attribute. The test case : public class ObjectDbTest ...

 
api-jpa

javax.persistence.AssociationOverride

Used to override a mapping for an entity relationship.(Annotation of JPA)

 
manual

FROM clause (JPQL / Criteria API)

Explains how to use the FROM clause and JOIN expressions in a JPA/JPQL query.... From's method Create a join to the specified attribute using the given join type. See JavaDoc Reference Page... ... method Create a path corresponding to the referenced attribute. See JavaDoc Reference Page... ( "name" ) ...

 
forum_thread

Schema evolution & renamed/moved enum

Hello, I have an entity with an attribute of type enum say com.pkg1.MyEnum. I created a few instances of the class with this attribute of type com.pkg1.MyEnum. Now, I moved that enum to a different package and renamed it say com.pkg2.MyNewEnum. When I open my database again, the attribute is null. I don't seem to be able to use the <schema> tag in the config file because my enum is not an entity. What is a the proper way of handling the migration? Thanks, Farid  ... Hello, I have an entity with an attribute of type enum say com.pkg1.MyEnum. I created a few instances of the class with this attribute of type com.pkg1.MyEnum and stored them in the database. Now, ...

 
api-jpa

javax.persistence.OrderBy

Specifies the ordering of the elements of a collection valued association or element collection at the point when the association or collection is retrieved.(Annotation of JPA)

 
api-jpa

getPluralAttributes()

Return all multi-valued attributes (Collection-, Set-, List-, and Map-valued attributes) of the managed type.(Method of javax.persistence.metamodel.ManagedType)

 
api-jpa

getList(name, elementType)

Return the List-valued attribute of the managed type that corresponds to the specified name and Java element type.(Method of javax.persistence.metamodel.ManagedType)

 
api-jpa

getDeclaredPluralAttributes()

Return all multi-valued attributes (Collection-, Set-, List-, and Map-valued attributes) declared by the managed type.(Method of javax.persistence.metamodel.ManagedType)

 
api-jpa

getDeclaredList(name, elementType)

Return the List-valued attribute declared by the managed type that corresponds to the specified name and Java element type.(Method of javax.persistence.metamodel.ManagedType)