ObjectDB Database Search

Every entity object that is stored in the database has a primary key . Once assigned, the primary ... an object database, ObjectDB supports implicit object IDs, so an explicitly defined primary key is not required. But ObjectDB also supports explicit standard JPA primary keys , including composite primary

support of the JPA and JDO APIs. Fundamental features of relational databases (e.g. primary keys ... callback methods and listener classes . JDO callback methods and listener classes. Primary Keys Support of primary keys in ObjectDB is unique compared to other Objec-Oriented Databases. Primary Key

a primary key of a managed object", but my application is not trying to change the primary key .  ... . Could you please provide details on the primary key of JdoBlob2 ? Is it composite? embedded ID ... in JDO to represent a combination of class + primary key and therefore it seems a bit strange to use

;bidirectional @OneToOne association that has a shared primary key , example: http://fruzenshtein.com/bidirectional-one-to-one- primary - key -association/ Can ObjectDB support this same specific relationship ... keys , i.e. the primary key will be stored at least on one side of the relationship

and recommendations, in particular there are some primary keys with value == 0. These cause problems for objectDB, typically "JPA Unexpected argument as primary key ". When using eclipselink, there is a workaround ... Lister There is nothing wrong with 0 as a primary key value. For example the following code doesn't

Primary Key   with two Longs b) Embedded Primary Key with two Longs c) Furthermore, as String ... for the database engine. In both cases it is a composite primary key with the same size and structure. (b ... Can you give us a recommendation as we can represent the Key (UUID) most efficient? Both in terms

.RollbackException Failed to commit transaction: Attempt to reuse an existing primary key value ... .EntityExistsException: com.objectdb.o.UserException: Attempt to reuse an existing primary key value ... with the same primary key . Unfortunately it is impossible to provide help based on this report

Hi,   I don't have a useful test case to expose this issue, but I am getting an intermittent "Attempt to reuse an existing primary key value". In this particular instance, the error is: Attempt to reuse an existing primary key value (com.x.y.z.UserPassword:1) (error 642) at com.objectdb.jpa

.3.7_21 should fix it. The composite primary key issue is unclear, since switching to a single primary key field doesn't seem to make any difference. support Support

that, and query the table all the PK fields are null or 0.  What can I do to modify primary keys ?     Trianglehead Json Error ObjectDB doesn't support changing primary keys , as it may break

to reuse an existing primary key value... My primary keys are annotated as shown below : @Id

to reuse an existing primary key value (Persist_Remove_Persist$EntityA:1)   We created a small ... removing an entity object and then in the same transaction persisting another object with the same primary key of the removed object. Obviously a possible workaround is to update the object instead

an existing primary key value (MyTestCase$MyEntityChild:'child1') at com.objectdb.o ... test case, i am pretty sure that "Attempt to reuse an existing primary key value" on my merge

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

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 the only one record

Internal ObjectDB error by read the primary key

generated for that field. This is primarily intended for primary key fields but ObjectDB ... for entity objects with no primary key fields defined (as explained in the previous section ). The same number generator is also used to generate numeric values for  primary key fields annotated by

of entity classes and to keep them as simple as possible. Retrieval by Class and Primary Key Every entity object can be uniquely identified and retrieved by the combination of its class and its primary key ... object whose primary key is 1: Employee employee = em. find (Employee.class, 1); Casting

a primary key and what a version field is and how to use it. If you are already familiar with JPA you might have noticed that the Point entity class has no primary key ( @Id ) field. As an object database, ObjectDB supports implicit object IDs, so an explicitly defined primary key is not required

(Mapped By) fields Primary key (ID) fields Version field The first three groups (transient ... two groups ( primary key and version fields) can only be used in entity classes. Primary key fields are discussed in the Primary Key section. Transient Fields Transient entity fields are fields

Hello, I have a problem with inserting of many entities. We use strings as primary key and indices ... ? See both examples. btc_es BTC EmbeddedSystems Correction. The case with strings as primary key ... programs demonstrate well that automatic  long primary keys are indeed much more efficient

, most object 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

). An entity object can be specified by type and primary key separated by # (e.g. Point#1). A collection ... to an existing entity object, which has to be specified by type and primary key separated by # (e.g. Point ... object, which has to be specified by type and primary key separated by # (e.g. Point#1). The Edit

) if different entities have the same value in a unique field (similar to how primary keys behave ... fields (not on primary key / version fields). Composite Index A composite index is an index ... system rather than in memory. The keys of the BTree are all the unique values in the indexed field (or arrays of values

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

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

Country objects ordered by currency as the primary sort key and by name as the secondary sort key ... expression is the primary order expression. Any additional order expression is used to order results

, however, do not have an identity ( primary key ) of their own which leads to some limitations (e.g ... and map types are supported, as long as their values (i.e. elements in collections and arrays and keys

already contains another entity of the same type with the same primary key , an EntityExistsException

with the same identity (i.e. same type and primary key ). If the EntityManager does not manage such an entity

manner. The IdentifiableType adds methods for retrieving information on the primary key

and primary key : em. find (MyEntity2.class, Long.valueOf(1),      Collections

(=, , == , != ). For entities, e1 = e2 if e1 and e2 have the same type and the same primary key value

because of an attempt to store a new entity object with a primary key that is already in use by another existing

JPA Method in jakarta.persistence.criteria.MapJoin Path key () Create a path expression that corresponds to the map key . Return: path corresponding to map key Since: JPA 2.0

JPA Method in jakarta.persistence.criteria.CriteriaBuilder Expression keys (   M map ) Create an expression that returns the keys of a map. Parameters: map - map Return: set expression Since: JPA 2.0

given persistent entity identity (defined by an entity type and primary key ) there is at most one entity ... instances, plain entities by their primary key , and execute plain which range over entity types ... by primary key . Search for an entity of the specified class and primary key . If the entity instance

Hi! We have an entity with a composite primary key on "primaryVariantOid" and "storeOid" fields ... entityManager.find to look up every entity by the primary key . This ended up being even faster ... was also trying to find if there was any API like entityManager.find, but for bulk retrieval by 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. support Support

Hi, if Id = 0 I got javax.persistence.EntityExistsException: com.objectdb.o.UserException: Attempt to reuse an existing primary key value (ru.dz.train.test.ZeroIdTest$MyEntity:0)   if Id=1 no exception code : import javax.persistence.*; public class ZeroIdTest {     public

Specifies a primary key column that is used as a foreign key to join to another table. It is used ... to a primary table; and it may be used in a OneToOne mapping in which the primary key of the referencing ... to have the same names as the primary key columns of the primary table of the superclass. Example: Customer

), an RSA private key and its corresponding public key (the SSL protocol is based on the RSA ... signature. This file is generated from the Keystore file by omitting the private key (it still contains the general information and the public key ). You can generate these files using the JDK keytool

.GenerationType Enumerates the defined primary key generation strategies. See Also: GeneratedValue ... database. For a primary key of type java.util.UUID or String, this is equivalent to UUID . For a primary ... IDENTITY Indicates that the persistence provider must assign primary keys for the entity using a database

of the referencing entity or embeddable class; " _ "; the name of the referenced primary key column ... of the entity; " _ "; the name of the referenced primary key column. Since: JPA 1.0 boolean nullable default ... the primary key column of the referenced table. Since: JPA 1.0 String table default "" (Optional

table. If no primary key join columns are specified, the join columns are assumed to reference the primary key columns of the primary table, and have the same names and types as the referenced primary key columns of the primary table. Example 1: Single secondary table with a single primary key

: Annotation Defines a primary key generator that may be referenced by name when a generator element ... on the primary key field or property. The scope of the generator name is global to the persistence ... on an entity class or primary key attribute of an entity class, then the name defaults to the name

the primary key column of the referenced table. Since: JPA 2.0 String table default "" (Optional) The name ... relationship using a foreign key mapping strategy, the name of the primary table of the entity ... a mapping to an entity that is a map key . The map key join column is in the collection table, join

key for associations of type java.util.Map when the map key is itself the primary key or a persistent ... other than the primary key is used as a map key then it is expected to have a uniqueness constraint ... . Default: If the name element is not specified, the primary key of the associated entity is used as

primary key type whose fields or properties map to the plain fields or properties of the annotated entity class. The specified primary key type must: be a non- abstract regular Java class, or a Java record ... primary key of the database table. The primary key fields of the entity must be annotated Id

An object ID is a combination of a persistence capable class and a primary key . It provides ... for persistence capable classes with a simple single field primary key : Object IDs are used in many ... but should not be used as the type of a primary key field in a persistence capable class. For example