About collection

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Manual
13

Shared (L2) Entity Cache

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.Collections.singletonMap(         "javax.persistence.cache
Manual
13

WHERE clause (JPQL / Criteria API)

variable. Before passing these Country objects to the SELECT clause for collecting as query results ... and then collected as query results. WHERE Predicate and Indexes Formally, the WHERE clause functions as ... , relational operators, logical operators) and functions (numeric functions, string functions, collection
Manual
13

Deleting JPA Entity Objects

can be referenced by a collection field): @Entity class Employee { : @OneToOne ... objects. Orphan removal can also be set for collection and map fields. For example: @Entity class ... ; : } In this case, removal of an Address object from the collection leads to automatic removal
Manual
13

Database Schema Evolution

any date type to any date type. From any collection or array type to any collection or array type, as ... collection or array that can contain that object as en element. From any map type to any map type as
JPA Doc
13

javax.persistence.criteria.PluralJoin

to all collection types. It is not intended to be used directly in query construction. Since: JPA 2.0 ... ( PluralAttribute attribute) Create a fetch join to the specified collection-valued attribute using an inner join. Create a fetch join to the specified collection-valued attribute using an inner join
JPA Doc
13

javax.persistence.criteria.From

of associations, embeddables, and collections belonging to the type, and for Paths of attributes ... collection-valued attribute using an inner join. Create a fetch join to the specified collection ... ) Create a fetch join to the specified collection-valued attribute using the given join type. Create
JPA Doc
12

javax.persistence.criteria.Join

a fetch join to the specified collection-valued attribute using an inner join. Create a fetch join to the specified collection-valued attribute using an inner join. Parameters: attribute - target ... > attribute, JoinType jt) Create a fetch join to the specified collection-valued attribute using
JPA Doc
12

javax.persistence.criteria.Root

,Y> fetch( PluralAttribute attribute) Create a fetch join to the specified collection-valued attribute using an inner join. Create a fetch join to the specified collection-valued attribute ... to the specified collection-valued attribute using the given join type. Create a fetch join
FAQ
11

What are the main benefits of using ObjectDB?

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
Manual
11

JPA Query Expressions (JPQL / Criteria)

: =, <>, <, <=,>, >=, IS [NOT] NULL, [NOT] BETWEEN, including Collection operators: [NOT] IN, IS [NOT] EMPTY, [NOT ... expressions (currentDate, currentTime, currentTimestamp). Collection expressions (isEmpty, isNotEmpty