ObjectDB Database Search

Collections may appear in JPQL queries: as parameters - when collections are assigned as arguments. as  path expressions - in navigation to persistent collection fields. IS [NOT] EMPTY The IS [NOT] EMPTY operator checks whether a specified collection is empty or not. For example: c.languages

on the collection , use and disclosure of Your information when You use the Service and tells ... the Service. By using the Service, You agree to the collection and use of information in accordance ... how the Service is used. Usage Data  refers to data collected automatically, either generated by

, Date and Math types. Multi value types - Collections , Maps and Arrays. Miscellaneous types: Enum ... : Collection types from package java.util : ArrayList , Vector , Stack , LinkedList , ArrayDeque ... dimensional arrays). Both generic (e.g. ArrayList ) and non generic (e.g. ArrayList ) collection

). An entity object can be specified by type and primary key separated by # (e.g. Point#1). A collection ... with the query results, and the size of the result collection and the query execution time ... the object itself from the database. Editing Collections Elements can be added to collections by using

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

collection and map persistent fields (i.e. through one-to-one and many-to-one relationships ... navigation through non collection and map persistent fields are also retrieved. Theoretically, in some ... ) private Employee manager; : } The default for non collection and map references is FetchType . EAGER

JPA Method in javax.persistence.criteria.Path Expression get (    PluralAttribute   collection ) Create a path corresponding to the referenced collection -valued attribute. Parameters: collection - collection -valued attribute Return: expression corresponding to the referenced attribute Since: JPA 2.0

 elem,     Expression   collection ) Create a predicate that tests whether an element is not a member of a collection . If the collection is empty, the predicate will be true. Parameters: elem - element collection - expression Return: is-not-member predicate Since: JPA 2.0

; Expression  elem,     Expression   collection ) Create a predicate that tests whether an element is not a member of a collection . If the collection is empty, the predicate will be true. Parameters: elem - element expression collection - expression Return: is-not-member predicate Since: JPA 2.0

;elem,     Expression   collection ) Create a predicate that tests whether an element is a member of a collection . If the collection is empty, the predicate will be false. Parameters: elem - element collection - expression Return: is-member predicate Since: JPA 2.0

JPA Method in javax.persistence.criteria.CriteriaBuilder Expression size (   C  collection ) Create an expression that tests the size of a collection . Parameters: collection - collection Return: size expression Since: JPA 2.0

; Expression  elem,     Expression   collection ) Create a predicate that tests whether an element is a member of a collection . If the collection is empty, the predicate will be false. Parameters: elem - element expression collection - expression Return: is-member predicate Since: JPA 2.0

JPA Method in javax.persistence.criteria.From CollectionJoin join (    CollectionAttribute   collection ) Create an inner join to the specified Collection -valued attribute. Parameters: collection - target of the join Return: the resulting join Since: JPA 2.0

JPA Method in javax.persistence.criteria.From CollectionJoin join (    CollectionAttribute   collection ,     JoinType  jt ) Create a join to the specified Collection -valued attribute using the given join type. Parameters: collection - target of the join jt - join type Return: the resulting join Since: JPA 2.0

JPA Method in javax.persistence.criteria.CriteriaBuilder Predicate isEmpty (    Expression   collection ) Create a predicate that tests whether a collection is empty. Parameters: collection - expression Return: is-empty predicate Since: JPA 2.0

JPA Method in javax.persistence.criteria.CriteriaBuilder Predicate isNotEmpty (    Expression   collection ) Create a predicate that tests whether a collection is not empty. Parameters: collection - expression Return: is-not-empty predicate Since: JPA 2.0

JPA Method in javax.persistence.criteria.CriteriaBuilder Expression size (    Expression   collection ) Create an expression that tests the size of a collection . Parameters: collection - expression Return: size expression Since: JPA 2.0

JPA Enum Constant in javax.persistence.metamodel.Attribute $PersistentAttributeType ELEMENT_ COLLECTION Element collection Since: JPA 2.0

JPA Enum Constant in javax.persistence.metamodel.PluralAttribute $CollectionType COLLECTION Collection -valued attribute Since: JPA 2.0

- for references of entity types. OneToMany , ManyToMany - for collections and maps of entity types ... fields are essential for collection fields when using ORM JPA implementations, but not when using ... may improve efficiency when managing very large collections that are changed

collection of the outer c1 . In this case, by propagation of a WHERE constraint to the FROM phase ... iteration over specified collections of objects. The following query uses one range variable and one join ... that collection . You might have noticed that this query is equivalent to the previous neighbors query

and the warning is avoided. The query result collection functions as any other ordinary Java collection . For example, a result collection of a parameterized type can be iterated easily using an enhanced ... collection after query execution (e.g. by results.get(0) ). To eliminate this routine operation JPA

objects to the SELECT clause for collecting as query results, the WHERE clause gets an opportunity ... evaluates to TRUE are passed to the SELECT clause and then collected as query results. WHERE Predicate ... ) and functions (numeric functions, string functions, collection functions). The WHERE predicate

(when applicable). From any date type to any date type. From any collection or array type to any collection or array type, as long as the elements are convertible (e.g. from int[] to ArrayList ). From any object to any collection or array that can contain that object as en element. From any map

can be referenced by a collection field): @Entity class Employee { : @OneToOne ( cascade ... for collection and map fields. For example: @Entity class Employee { : @OneToMany ( orphanRemoval =true) private List addresses; : } In this case, removal of an Address object from the collection leads

Every EntityManager owns a persistence context , which is a collection of all the entity objects ... and primary key: em. find (MyEntity2.class, Long.valueOf(1),      Collections ... operation. For example: em. find (MyEntity2.class, Long.valueOf(1),    Collections . singletonMap

( composite ) indices. Collection and array elements are indexable (extremely fast JOIN queries ... : java.lang.BigInteger and java.lang.BigDecimal. Collection types : Collection , List, Set, 

value path expressions can be used in the SELECT clause. Collection and map fields cannot be included ... for collecting and processing query results. If an entity class is used as a result class, the result entity

objects that are referenced by that field (multiple entity objects can be referenced by a collection ... can be referenced by a collection field): @Entity class Employee { : @OneToOne ( cascade = CascadeType . MERGE

: =, , =, IS [NOT] NULL, [NOT] BETWEEN, including  Collection operators: [NOT] IN, IS [NOT] EMPTY ... , substring, ... ). Data expressions ( currentDate , currentTime , currentTimestamp ). Collection

, java.sql.Timestamp. Any enum type. Reference to an entity object. Arrays and collections that contain ... a collection , so multiple values will be maintained by the index for every entity. Multi part paths in

the execution time of object oriented applications significantly. For instance, collection and map ... multiple values (even for a simple data structure such as a collection of strings). In addition

in  ManagedType  to return attributes of Collection , List , Set a Map types in a type safe ... : CollectionAttribute  - represents attributes of Collection types. SetAttribute  - represents attributes

. It is usually recommended to use collections rather than arrays when using JPA. Collections

that field (multiple entity objects can be referenced by a collection field): @Entity class Employee

Numeric values may appear in JPQL queries in many forms: as  numeric literals - e.g. 123 , -12.5 . as parameters - when numeric values are assigned as arguments. as  path expressions - in navigation to persistent numeric fields. as aggregate expressions - e.g. COUNT. as collection

loading of entity objects. With no enhancement, only persistent collection and map fields

content, such as persist and remove . Database updates are collected and managed in memory and applied

( collectively "Losses") arising from claims, lawsuits and other legal actions brought by a third party

persistable class. The dot (.) operator cannot be applied to collections , maps and values of simple

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

produces objects for examination and the WHERE clause selects which objects to collect as results

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

during a period of time are stored continuously and can be collected by accessing a minimum number of database

; collection ) Create a predicate that tests whether a collection is empty. Parameters: collection ... Since: JPA 2.0 Predicate isMember (E elem,  Expression   collection ) Create a predicate that tests whether an element is a member of a collection . If the collection is empty, the predicate

might be garbage collected , at the option of the JDO implementation. Before being used ... . Parameters: pc - a persistent instance Since: JDO 1.0 void deletePersistentAll ( Collection  pcs) Delete a Collection of instances from the data store. Parameters: pcs - a Collection of persistent

. There are three required elements in a Query : the class of the results, the candidate collection ... of the subquery candidateCollectionExpression - the candidate collection of the subquery as an expression using ... to be used in this Query candidateCollectionExpression - the candidate collection to apply