About primary key

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Manual
23

ORDER BY clause (JPQL / Criteria API)

. The following query returns Country objects ordered by currency as the primary sort key and by name as the secondary sort key: SELECT c.currency, c.name FROM Country c ORDER BY c.currency, c.name ... this case, the first expression is the primary order expression. Any additional order expression
Manual
23

Database Management Settings

Explains settings and performance tuning of the ObjectDB Java object database for JPA/JDO.
JPA Doc
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javax.persistence.PrimaryKeyJoinColumn

get methods) Specifies a primary key column that is used as a foreign key to join to another table ... to a primary table; and it may be used in a OneToOne mapping in which the primary key ... to have the same names as the primary key columns of the primary table of the superclass. Example
JDO Doc
19

Key.deleteAction

Annotation Element javax.jdo.annotations.Key ForeignKeyAction deleteAction Delete action to apply to the foreign key for the key. Returns: delete action to apply to the foreign key for the key Default value: javax.jdo.annotations.ForeignKeyAction.UNSPECIFIED Since: JDO 2.1
JDO Doc
19

Key.updateAction

Annotation Element javax.jdo.annotations.Key ForeignKeyAction updateAction Update action to apply to the foreign key for the key. Returns: update action to apply to the foreign key for the key Default value: javax.jdo.annotations.ForeignKeyAction.UNSPECIFIED Since: JDO 2.1
JDO Doc
19

addExtension(key, value)

Method javax.jdo.Query void addExtension(   String key,   Object value ) Add a vendor-specific extension to this query. The key and value are not standard. An implementation must ignore keys that are not recognized. Parameters: key - the key of the extension value - the value of the extension Since: JDO 2.0
Manual
19

JPA Persistable Types

, however, do not have an identity (primary key) of their own which leads to some limitations (e.g ... and keys and values in maps) are either null values or instances of persistable types. In addition
Result
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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
JDO Doc
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CharIdentity(pcClass, key)

Constructor javax.jdo.identity.CharIdentity CharIdentity(   Class pcClass,   char key ) Constructor with class and key. Parameters: pcClass - the target class key - the key Since: JDO 1.0
JDO Doc
19

CharIdentity(pcClass, key)

Constructor javax.jdo.identity.CharIdentity CharIdentity(   Class pcClass,   Character key ) Constructor with class and key. Parameters: pcClass - the target class key - the key Since: JDO 1.0