About unique

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JDO Doc
18

JDO Predefined ID Classes

An object ID is a combination of a persistence capable class and a primary key. It provides a unique representation of a persistent object. The following classes serve as predefined ID classes ... instances of MyClass) can be represented uniquely by StringIdentity, as a combination of a class and a string value.
Manual
18

JPA Primary Key

the database is uniquely identified (and can be retrieved from the database) by the combination of its type and its primary key. Primary key values are unique per entity class. Instances of different entity
Result
18

ObjectDB Object Database Features

solution. General Highly optimized code (as a result of many profiling sessions). Unique data structures ... methods and listener classes. Primary Keys Support of primary keys in ObjectDB is unique compared
Issue
17

NoResultException: No matching results for a unique query

I am very often getting a "com.objectdb.o._NoResultException: No matching results for a unique query" when modifying my already persisted entities within a transaction. I cannot replicate it however because it happens infrequently. The weird thing is that the entity nevertheless gets comitted
Forum
16

Immediately retrieve unique id

Immediately retrieve unique id
Manual
12

GROUP BY and HAVING clauses

: The properties that are used for grouping (each group has unique value combination). Aggregate calculations
FAQ
12

Is ObjectDB a NoSQL Database?

ObjectDB is a unique NoSQL database. It doesn't have the known disadvantages and limitations of NoSQL technology, which are weak query capabilities and lack of ACID (atomicity, consistency, isolation, durability). Unlike other NoSQL solutions, ObjectDB provides full support of rich complex queries
Manual
12

JPA Named Queries

carefully to avoid collision (e.g. by using the unique entity name as a prefix). It makes sense
Manual
12

JPA Persistable Types

class MyEntity { } Entity names must be unique. When two entity classes in different packages
Manual
12

Retrieving JPA Entity Objects

object can be uniquely identified and retrieved by the combination of its class and its primary key