About EntityManager

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ObjectDB Object Database Features

and timeout. Caching L1 entity object cache (per EntityManager). L2 shared entity data cache ... on an EntityManager/PersistenceManager. Supports automatic download of created backups from the server
Manual
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SELECT clause (JPQL / Criteria API)

The ability to retrieve managed entity objects is a major advantage of JPQL. For example, the following query returns Country objects that become managed by the EntityManager em: TypedQuery ... are not associated with an EntityManager and changes to them when a transaction is active are not
Manual
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JPA Criteria API Queries

the EntityManagerFactory's getCriteriaBuilder method or by the EntityManager's getCriteriaBuilder method
Manual
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JPA Named Queries

at runtime by the same Query and TypedQuery interfaces but different EntityManager factory methods
Manual
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JPA Query API

with an EntityManager (represented by em in the following code snippets), which serves as a factory
Manual
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Online Backup

on an EntityManager (em) that represents the connection (local or remote) to the database:     em
Tutorial
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Step 3: Add a Main Class

= Persistence.createEntityManagerFactory("$objectdb/db/points.odb"); EntityManager em
Tutorial
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Step 3: Add a Main Class

("$objectdb/db/points.odb"); EntityManager em = emf.createEntityManager(); // Store 1000
Tutorial
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Step 6: Set the Spring XML

, controllers and transactions), to inject a JPA EntityManager, to manage transactions and to look for JSP
Tutorial
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Step 6: Set the Spring XML

, controllers and transactions), to inject a JPA EntityManager, to manage transactions and to look