 25 | 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 |
24 | Internal ObjectDB error by read the primary key |
23 | and primary key separated by # (e.g. Point#1). A collection can be specified as a comma separated list ... , which has to be specified by type and primary key separated by # (e.g. Point#1). The Edit > Set Reference ... type and primary key separated by # (e.g. Point#1). The Edit > Add to Collection > Add New Object |
23 | 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 |
20 | 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 |
19 | (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 |
19 | are useful in representing composite primary keys as explained in the Primary Key section of the ObjectDB manual. |
19 | Automatically generated values are mainly useful for primary key fields, but are supported by ObjectDB also for regular (non primary key) persistent fields. At the field level, the @GeneratedValue with an optional GenerationType strategy is specified: The @GeneratedValue annotation |
19 | . 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 |
18 | 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 |
