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FAQ
34

Can I use ObjectDB to access a relational database?

To access relational databases using the Java Persistence API (JPA) you will need an Object Relational Mapping (ORM) tool, such as Hibernate, TopLink, EclipseLink, Open JPA or DataNucleus. The DataNucleus ORM implementation supports also the Java Data Objects (JDO) API. ObjectDB is a full featured
Result
33

What is new in ObjectDB 2.0?

ObjectDB 2.0 supports many new features and improvements, including: Most of the features of the new JPA 2.0 and JDO 2.2 APIs. User defined IDs (primary key) and sequences. Support of unlimited index keys size. SQL like queries ("select from ... where ..."). Real non blocking multithreading in
FAQ
33

Where can I learn how to use ObjectDB?

experience in database development, SQL or JPA, but such experience is definitely not a prerequisite.
JPA Doc
25

javax.persistence.criteria.CriteriaBuilder

. Since: JPA 2.0 Learn how to define queries using the criteria API in Chapter 4 of the ObjectDB/JPA manual ... - expression Returns: absolute value Since: JPA 2.0 Expression all( Subquery subquery) Create ... : subquery - subquery Returns: all expression Since: JPA 2.0 Predicate and( Predicate... restrictions
JPA Doc
20

javax.persistence.criteria.MapJoin

collection that has been specified as a java.util.Map. Since: JPA 2.0 Selection alias(String name ... : selection item Since: JPA 2.0 Expression as(Class type) Perform a typecast ... expression of the given type Since: JPA 2.0 Expression> entry() Create an expression
JPA Doc
20

javax.persistence.criteria.Join

, PluralJoin, SetJoin A join to an entity, embeddable, or basic type. Since: JPA 2.0 Learn how to use JPA criteria API's Join in Chapter 4 of the ObjectDB/JPA manual. Selection alias(String name ... : selection item Since: JPA 2.0 Expression as(Class type) Perform a typecast upon the expression
JPA Doc
20

javax.persistence.criteria.ListJoin

collection that has been specified as a java.util.List. Since: JPA 2.0 Selection alias(String name ... : selection item Since: JPA 2.0 Expression as(Class type) Perform a typecast ... expression of the given type Since: JPA 2.0 Fetch fetch(String attributeName) Create a fetch join
JPA Doc
20

javax.persistence.criteria.CollectionJoin

over an association or element collection that has been specified as a java.util.Collection. Since: JPA 2.0 Selection ... . Parameters: name - alias Returns: selection item Since: JPA 2.0 Expression as(Class type) Perform ... of the expression Returns: new expression of the given type Since: JPA 2.0 Fetch fetch(String
JPA Doc
20

javax.persistence.criteria.PluralJoin

to all collection types. It is not intended to be used directly in query construction. Since: JPA 2.0 ... . Parameters: name - alias Returns: selection item Since: JPA 2.0 Expression as(Class type ... of the expression Returns: new expression of the given type Since: JPA 2.0 Fetch fetch(String
JPA Doc
20

javax.persistence.criteria.SetJoin

collection that has been specified as a java.util.Set. Since: JPA 2.0 Selection alias(String name ... : selection item Since: JPA 2.0 Expression as(Class type) Perform a typecast upon the expression ... expression of the given type Since: JPA 2.0 Fetch fetch(String attributeName) Create a fetch join