About ManyToOne
JPA Entity Fields
Explains how to define and use primary keys in JPA, including composite and embedded primary keys.... See JavaDoc Reference Page... , ManyToOne javax.persistence.ManyToOne JPA annotation Defines a single-valued association to ...
JPA Annotations for Relationships
Reference (JavaDoc) of JPA 2 relationship annotations, including @ManyToMany, @ManyToOne, @OneToMany, @OneToOne, @OrderBy and @MapKey.... javax.persistence.ManyToMany javax.persistence.ManyToOne javax.persistence.OneToMany ...
LAZY @ManyToOne field functions as EAGER
In the code example below (also attached) I would like to understand why I am able to print to console a lazy @ManyToOne field after the entity manager closes. There is a switch DO_VIEW_BEFORE_CLOSE, and when it is true the fields are accessed and output before the finding entity manager closes and as expected both a LAZY @ManyToOne field and an EAGER @ManyToOne field are viewable: b.cLazy:{C}[2]"cLazy" b.cEager:{C}[3]"cEager" ... to understand why I am able to print to console a lazy @ManyToOne field after the entity manager closes. There is a ... finding entity manager closes and as expected both a LAZY @ManyToOne field and an EAGER @ManyToOne field are viewable: b.cLazy:{C}[2]"cLazy" ...
javax.persistence.ManyToOne
Defines a single-valued association to another entity class that has many-to-one multiplicity.(Annotation of JPA)
Should derived fields of an EmbeddedId be manually maintained by app code?
If I have an Entity which has a primary key which is derived and I am implementing it using @EmbeddedId, am I responsible for maintaining the derived fields of the @EmbeddedId? I could not find anything in the JPA 2.0 spec http://download.oracle.com/auth/otn-pub/jcp/persistence-2.0-fr-oth-JSpec/persistence-2_0-final-spec.pdf?e=1317047713&h=54831c176e81a244a4c309e13eba0b27 which tells me what to expect. ... FetchType ; import javax. persistence . ManyToOne ; import javax. persistence . MapsId ; ... public ECompoundKeyMapItemId id ; @ ManyToOne ( fetch = FetchType . LAZY ) @ ...
find() cost unreasonable time!
Hi, I make a full binary tree of 4095 node, I check the first 9 node, but the root cost 24 seconds, why? Result: ... IDENTITY ) private int id ; @ ManyToOne @ JoinColumn ( name = "parent" ) ... JoinColumn ; import javax. persistence . ManyToOne ; import javax. persistence . OneToMany ; ...
javax.persistence.OneToMany
Defines a many-valued association with one-to-many multiplicity.(Annotation of JPA)
OneToMany and cascade delete problem
Hi, I don't really know if this is a bug or maybe model that I make is bad. I have a problem with with two different classes with OneToMany relation to one, shared class. For example (first class): @Entity public static class Store { @OneToMany(targetEntity = Offer.class, mappedBy = "store") private List<Offer> offers; } second class: ... public static class Offer { @ ManyToOne private Product product ; @ ManyToOne private Store store ; } Naming of this ...
javax.persistence.MapKey
Specifies the map key for associations of type java.util.Map when the map key is itself the primary key or a persistent field or property of the entity that is the value of the map.(Annotation of JPA)
Object explorer cannot open odb file. ObjectDB many-to-many relationship
I created a data model to test many-to-many relationship with a link table as following (full code in attachement) ... Assignement { @ Id @ ManyToOne ( cascade = CascadeType . ALL , optional ... User user ; @ Id @ ManyToOne ( cascade = CascadeType . ALL , optional ...
