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PrimaryKeyJoinColumn.referencedColumnName

) The name of the primary key column of the table being joined to. Defaults to the same name as the primary key column of the primary table of the superclass (JOINED mapping strategy); the same name as the primary key column of the primary table (SecondaryTable mapping); or the same name as the primary
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PrimaryKeyJoinColumn.name

of the primary key column of the current table. Defaults to the same name as the primary key column of the primary table of the superclass (JOINED mapping strategy); the same name as the primary key column of the primary table (SecondaryTable mapping); or the same name as the primary key column for the table
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javax.persistence.IdClass

javax.persistence Annotation IdClass Target: Classes Specifies a composite primary key class ... the primary key class and the primary key fields or properties of the entity must correspond ... value Primary key class Primary key class Since: JPA 1.0
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MapKey.name

or property of the associated entity that is used as the map key. Default: If the name element is not specified, the primary key of the associated entity is used as the map key. If the primary key is a composite primary key and is mapped as IdClass, an instance of the primary key class is used as the key. Default value: "" Since: JPA 1.0
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javax.jdo.spi.JDOImplHelper

has no relationship with the values of the primary key fields of the persistence-capable instance ... - the PersistenceCapable class used as the key for lookup. fieldNames - an array of String field names ... to an outside source from the key fields in the ObjectId. Copy fields to an outside source from
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javax.jdo.annotations.Element

"false". Returns: whether to generate or assume a primary key constraint Default value: "" Since: JDO 2.1 ... to any foreign key for the element. Delete action to apply to any foreign key for the element. Returns: delete action to apply to any foreign key for the element Default value: javax.jdo.annotations
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find(entityClass, primaryKey, lockMode, properties)

, LockModeType lockMode, Map properties ) Find by primary key and lock, using the specified properties. Search for an entity of the specified class and primary key and lock it with respect ... : entityClass - entity class primaryKey - primary key lockMode - lock mode properties - standard
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find(entityClass, primaryKey, properties)

,Object> properties ) Find by primary key, using the specified properties. Search for an entity of the specified class and primary key. If the entity instance is contained in the persistence context ... ignored. Parameters: entityClass - entity class primaryKey - primary key properties - standard
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javax.persistence.EmbeddedId

a derived primary key. If the entity has a derived primary key, the AttributeOverride annotation ... to primary key type of Employee } @Entity public class Dependent { // default ... to a persistent field or property of an entity class or mapped superclass to denote a composite primary
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find(entityClass, primaryKey, lockMode, properties)

lockMode, Map properties ) Find by primary key and lock, using the specified properties. Search for an entity of the specified class and primary key and lock it with respect to the specified ... - entity class primaryKey - primary key lockMode - lock mode properties - standard and vendor-specific

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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