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Running JPA Queries

should be ran using the getResultList method, as we expect to receive multiple objects in return ... of this assumption depends on the content of the database. If the database contains multiple Country objects

ORDER BY clause (JPQL / Criteria API)

expressions is vendor dependent. Query results can also be ordered by multiple order expressions. In

WHERE clause (JPQL / Criteria API)

)); Multiple Restrictions The second where method takes a variable number of arguments of Predicate type

Deleting JPA Entity Objects

should be cascaded automatically to entity objects that are referenced by that field (multiple entity objects


multiple variables and JOIN, and cannot include the GROUP BY, HAVING and ORDER BY clauses

Retrieving JPA Entity Objects

that field (multiple entity objects can be referenced by a collection field): @Entity class Employee

CRUD Database Operations with JPA

the result objects. It should be used (rather than getSingleResult) when multiple results

Server User List

the user to the machine on which the server is running. Multiple IP addresses can also be specified

Setting and Tuning of JPA Queries

uses automatic optimistic locking to prevent concurrent changes to entity objects by multiple users

Paths and Types in JPQL and Criteria API

, the current FROM variable (or FROM tuple when there are multiple variables) is simply skipped

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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