About primary key

21-30 of 200Refresh
Forum
31

Query on Embedded Primary Key?

Hi, I am trying to use Embedded Primary Key - but seems I can't retrieve them correctly with the query below - the query seem to work fine for other field (in the code = primkeycopy). The error I get when is below - it complains about a casting issue. Let me know how to fix it - (full reproducible
Forum
31

Uninitialized primary key (id = 0)

Exception in thread "main" [ObjectDB 2.2.9_04] javax.persistence.RollbackException Failed to commit transaction: Attempt to reuse an existing primary key value (image.Meta:0) (error 613) at com.objectdb.jpa.EMImpl.commit(EMImpl.java:277) I check the db by explorer.jar, and find
Issue
31

Object creation in the Explorer requires automatically set primary keys

The feature of creating new objects in the Explorer is currently supported only for entity classes that have primary keys that are set automatically.
Forum
29

Internal ObjectDB error by read the primary key

Internal ObjectDB error by read the primary key
FAQ
29

Is ObjectDB better than competing object databases?

databases do not support user defined primary keys, even though this is very useful in almost every application. ObjectDB supports user defined primary keys including composite primary keys. The support
Manual
29

Database Explorer

and primary key separated by # (e.g. Point#1). A collection can be specified as a comma separated list ... to set a reference to an existing entity object, which has to be specified by type and primary key ... to an existing entity object, which has to be specified by type and primary key separated by # (e.g
JDO Doc
26

javax.jdo.JDOEntityManager

) Find by primary key. Find by primary key. Search for an entity of the specified class and primary key ... there. Parameters: entityClass - entity class primaryKey - primary key Returns: the found entity instance or null ... an entity type or the second argument is is not a valid type for that entity’s primary key or
JPA Doc
24

javax.persistence.EntityManager

(Class entityClass, Object primaryKey) Find by primary key. Find by primary key. Search for an entity of the specified class and primary key. If the entity instance is contained in the persistence context, it is returned from there. Parameters: entityClass - entity class primaryKey - primary key
JDO Doc
24

javax.jdo.annotations.Key

javax.jdo.annotations Annotation Key Target: Fields (including property get methods) Annotation for the key of a map relation. Corresponds to the xml element "key". Since: JDO 2.1 String column Name of the column to store the key in. Name of the column to store the key in. Returns: name
JPA Doc
24

JPA Annotations for Classes

are useful in representing composite primary keys as explained in the Primary Key section of the ObjectDB manual.