ObjectDB Database Search

Hello, I have an entity E with an attribute which is a collection of entities (one to many ... the increment of the version of entity E when entities are added to or removed from the collection ... Farid Oudjane If it is a bidirectional relationship that is owned by the entities in the collection

I'm trying to work out the most efficient way to build a query that can compare two collections ... efficient way is to use some sort of hash function for the collections and to retrieve candidate collections by identical hash code. Candidate collections should then be further filtered by checking

Hi, I cannot see that it is possible to make scala collection classes persistable ... of the scala. collection ._  api for it to work ? (http://www.scala-lang.org/docu/files/ collections -api/ collections .html)   /Peter   lsPeter Peter You are right - Scala collections

1. In general, are there any restrictions of the use of @Embedded objects in collections , compared to @Entity ? 2. If you have a large nested collection of @Embedded objects, and you remove the parent @Entity , does the remove cascade through the whole collection ? 3. Is searching

Hi   In our project in few places there are used collections from emf framework eg EcoreEMap ... , nevertheless it causes some questions. I checked that i can easily change the type of collection between ... of this classes but only their content so I suppose that you treat collections some how differently. Can i

I have a call to getObjectsById( Collection ,boolean) that is throwing a JDOException the first time ... why this might occur? We're using ObjectDB 2.2.4_02. The collection being passed in is a HashSet ... argument. What happens if getObjectsById() is called with an empty collection ? carr.onstott Carr

Hello, I'm doing some tests to choose the best collection fetch strategy. I have entities with many lazy collections and i don't want to load them all. (depends on context) In JPA / Hibernate world ... seems to be more efficient than only fetch required collections . Can you confirm my observations ? To finish, wake

;    Collection getAddresses(); } Now what I want to do is to select all available Customer Entites and ORDER them by the first Address - Item (if any) in the collection ... only.. thanks! Alex quasado Alexander Adam hi, okay I've decided that selecting the first item of a collection

; How do I check if a particular member exist in one of the group? snoopydoghk Ka Leung Nesting a collection directly in another collection , although supported by ObjectDB, is not valid in JPA. Accordingly ... ) but it wouldn't be efficient. The recommended solution is avoid collections of collections , and instead wrap

,   As posted above your collection should be initialized as soon as you try to get the children ... of the collection . This will only work if you are within a transaction. (I usually do not start a transaction ... join fetch n.children where ....." this will also fetch your collection . Basically you can use

Hello, I have an entity MyEntity with a collection attribute myCollection. I ... method, this collection is null. If I try to access the collection from the PreUpdate method, the collection is populated. The collection is eagerly fetched. public class MyEntity {    

  v2.8.8_2 I have an entity that has 2 collection fields: @OneToMany(fetch = FetchType.EAGER)      Collection position;      @OneToMany(fetch = FetchType.EAGER)      Collection rotation ;   Now if I persist them so the values are: position

, ...) Collection expressions ( isEmpty , isNotEmpty , isMember , isNotMember , size ) Comparison expressions

an EntityManager . Persistence context The persistence context is the collection of all managed objects

contiguously and can be collected by accessing a minimum number of database pages. On the other hand

may be applied to: a basic attribute, or a collection attribute of any type other than java.util.Map , in which case the converter is applied to the elements of the collection . In these cases ... attribute , a collection attribute whose element type is an embeddable type, in which case the converter

or compound attribute path from a bound type or collection , and is a "primitive" expression ... collection ) Create a path corresponding to the referenced collection -valued attribute. Parameters: collection - collection -valued attribute Returns: expression corresponding to the referenced attribute

: - The type the represented collection belongs to - The element type of the represented collection - The type of the represented collection Super Interfaces: Attribute , Bindable Instances of the type PluralAttribute represent persistent collection -valued attributes. Since: Jakarta Persistence (JPA

Parameters: - The type the represented Collection belongs to - The element type of the represented Collection Super Interfaces: PluralAttribute , Attribute , Bindable Instances of the type CollectionAttribute represent persistent java.util. Collection -valued attributes. Since: Jakarta Persistence (JPA) 2.0

CollectionAttribute getCollection ( String name , Class elementType ) Return the Collection -valued attribute ... the Collection -valued attribute of the managed type that corresponds to the specified name. Inherited from ... the Collection -valued attribute declared by the managed type that corresponds to the specified name

CollectionAttribute getCollection ( String name , Class elementType ) Return the Collection -valued ... ) Return the Collection -valued attribute of the managed type that corresponds to the specified name ... elementType ) Return the Collection -valued attribute declared by the managed type that corresponds

CollectionAttribute getCollection ( String name , Class elementType ) Return the Collection -valued attribute ... Persistence (JPA) 1.0 CollectionAttribute getCollection ( String name ) Return the Collection -valued ... the Collection -valued attribute declared by the managed type that corresponds to the specified name

elementType ) Return the Collection -valued attribute of the managed type that corresponds ... CollectionAttribute getCollection ( String name ) Return the Collection -valued attribute of the managed type ... getDeclaredCollection ( String name , Class elementType ) Return the Collection -valued attribute declared by

CollectionAttribute getCollection ( String name , Class elementType ) Return the Collection -valued ... the Collection -valued attribute of the managed type that corresponds to the specified name. Inherited ... ) Return the Collection -valued attribute declared by the managed type that corresponds to the specified

Interfaces: Annotation Target: Method, Field Specifies the table that is used for the mapping of collections of basic or embeddable types. Applied to the collection -valued field or property. By default, the columns of the collection table that correspond to the embeddable class or basic type are derived

key join column is in the collection table, join table, or table of the target entity that is used ... upon the context. If the join is for a map key for an element collection , the foreign key column is in the collection table for the map value. If the join is for a map key for a ManyToMany entity

Interfaces: Annotation Target: Method, Field Declares a collection of instances of a basic type or embeddable class . Must be specified if the collection is to be mapped by means of a collection table ... of the collection . This element is optional only if the collection field or property is defined using Java

collection join object correlated to a collection join object of the enclosing query. Parameters ... . Since: Jakarta Persistence (JPA) 1.0 Predicate in ( Collection values ) Create a predicate to test whether the expression is a member of the collection . Inherited from Expression Parameters: values

collection . If the JoinColumn annotation itself is defaulted, a single join column is assumed ... is for an ElementCollection , the foreign key is in a collection table. Default (only applies if a single join column ... is for an element collection , the join column name is formed as the concatenation of the following

type. Since: Jakarta Persistence (JPA) 1.0 CollectionType getCollectionType () Return the collection type. Inherited from PluralAttribute Returns: collection type. Since: Jakarta Persistence (JPA) 1.0 ... Type getElementType () Return the type representing the element type of the collection . Inherited

. Since: Jakarta Persistence (JPA) 1.0 CollectionType getCollectionType () Return the collection type. Inherited from PluralAttribute Returns: collection type. Since: Jakarta Persistence (JPA) 1.0 ... getElementType () Return the type representing the element type of the collection . Inherited from

getCollectionType () Return the collection type. Inherited from PluralAttribute Returns: collection ... the element type of the collection . Inherited from PluralAttribute Returns: element type ... isCollection () Is the attribute collection -valued (represents a Collection , Set , List , or Map

. If the collection is defined using generics to specify the element type, the associated target entity ... within an embeddable class contained within an entity class to specify a relationship to a collection of entities ... field or property of the entity that is the owner of the relationship. When the collection is a java

: Annotation Target: Method, Field Specifies the ordering of the elements of a collection -valued association or element collection at the point when the association or collection is retrieved. The syntax ... embedded field or property. The OrderBy annotation may be applied to an element collection . When OrderBy

In addition to the locking behavior specified for NORMAL , element collections and relationships ... such a relationship or element collection generally locks only the rows in the join table or collection table for that relationship or collection . This means that phantoms are possible. Since: Jakarta

: predicate testing for membership. Since: Jakarta Persistence (JPA) 1.0 Predicate in ( Collection values ) Create a predicate to test whether the expression is a member of the collection . Inherited from Expression Parameters: values - collection of values to be tested against Returns: predicate

Persistence (JPA) 1.0 Predicate in ( Collection values ) Create a predicate to test whether the expression is a member of the collection . Inherited from Expression Parameters: values - collection ... is a member of the collection . Inherited from Expression Parameters: values - expression corresponding

( Collection values ) Create a predicate to test whether the expression is a member of the collection . Inherited from Expression Parameters: values - collection of values to be tested against Returns ... ) Create a predicate to test whether the expression is a member of the collection . Inherited from

. Since: Jakarta Persistence (JPA) 1.0 Predicate in ( Collection values ) Create a predicate to test whether the expression is a member of the collection . Inherited from Expression Parameters: values - collection ... is a member of the collection . Inherited from Expression Parameters: values - expression corresponding

( Collection values ) Create a predicate to test whether the expression is a member of the collection . Inherited from Expression Parameters: values - collection of values to be tested against Returns: predicate ... ) Create a predicate to test whether the expression is a member of the collection . Inherited from

: predicate testing for membership. Since: Jakarta Persistence (JPA) 1.0 Predicate in ( Collection values ) Create a predicate to test whether the expression is a member of the collection . Parameters: values - collection of values to be tested against Returns: predicate testing for membership

. Since: Jakarta Persistence (JPA) 1.0 Predicate in ( Collection values ) Create a predicate to test whether the expression is a member of the collection . Inherited from Expression Parameters: values - collection of values to be tested against Returns: predicate testing for membership. Since: Jakarta

to a collection element that is a managed type. This allows for construction of multi-node entity graphs ... to a collection element that is a managed type. This allows for construction of multi-node entity ... ) Add a node to the graph that corresponds to a collection element that is a managed type. This allows

is for an element collection , the map key column is in the collection table for the map value ... is for an element collection , the name of the collection table for the map value. If the map key

to specify a relationship to a collection of entities. If the relationship is bidirectional and the entity ... of the association. Optional only if the collection -valued relationship property is defined using Java generics. Must be specified otherwise. Defaults to the parameterized type of the collection when defined

that corresponds to a collection element that is a managed type. This allows for construction of multi-node ... a node to the graph that corresponds to a collection element that is a managed type. This allows ... to a collection element that is a managed type. This allows for construction of multi-node entity graphs

addElementSubgraph ( PluralAttribute attribute ) Add a node to the graph that corresponds to a collection element ... that corresponds to a collection element that is a managed type. This allows for construction of multi-node ... attributeName , Class type ) Add a node to the graph that corresponds to a collection element

We've tried to do a migration in large collection which failed with the following exception in ... Due to the size of that collection the containing entity object exceeds the maximum supported size ... . support Support In the collection which we got from the DB query and failed to iterate in the client

Hello, I found a bug when adding elements to a collection of Entities: Event { Collection ... Markus Ritter Your test case demonstrates an issue in tracking changes to a collection in an object of an old schema, in which the collection was not exist yet (as of changing attachment to attachments

, relying on automatic invocation of change events, including in embedded collections . We should check how this is implemented for nested collections . Note that this structure of a List as a value in a Map ... , which helped to find the bug. Actually the issue is not related to nested collections