About composite

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Issue
25

JPA Composite Key make Object Db throws "Unexpected exception (Error 990)"

Hello Object Db community :) I am using this wonderful library and I caught a strange exception while testing the "composite key" feature in JPA. Let's see what I am doing : @Entity public class Book { @EmbeddedId BookId id; } @Embeddable Class BookId { Integer bookIdCountry
Forum
25

Merge failure with composite primary key

it. The composite primary key issue is unclear, since switching to a single primary key field doesn't seem to make any difference. eurojet
Forum
25

Problem with Composite indices

has to be enforced by the application. Unfortunately a composite index on a field + a collection is not allowed. Ok. Thanks
Manual
20

Database Replication and Clustering

should represent a user on the slave server rather than on the master server. Finally, a composite url ... .odb;user=b;password=b" ); A composite url contains two or more database urls separated by
Manual
14

Numbers in JPQL and Criteria Queries

.g. LOCATE, LENGTH. as composite arithmetic expressions that use operators and functions to combine
Manual
14

SELECT clause (JPQL / Criteria API)

propagated to the database. Multiple SELECT Expressions The SELECT clause may also define composite
JPA Doc
14

JPA Annotations for Classes

are useful in representing composite primary keys as explained in the Primary Key section of the ObjectDB manual.
Result
14

What is new in ObjectDB 2.0?

query execution. Support of composite indexes and using indexes in query result sort. Improved query
Manual
14

Logical Operators in JPQL and Criteria API

Logical operators in JPQL and in JPA criteria queries enable composition of complex JPQL boolean expressions out of simple JPQL boolean expressions. Logical Operators ObjectDB supports 2 sets of logical operators, as shown in the following table: Set 1 - JPQL / SQL Set 2 - Java / JDO AND && OR
FAQ
14

Is ObjectDB better than competing object databases?

almost every application. ObjectDB supports user defined primary keys including composite primary keys. The support