About EntityManager

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Tutorial
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Step 4: Add a Servlet Class

= (EntityManagerFactory)getServletContext().getAttribute("emf"); EntityManager em ... the application scope attribute, and then an EntityManager (representing a database connection
Manual
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Entity Management Settings

the persistence context of the EntityManager (which serves as a first level cache). The valid values are "weak ... all its EntityManager instances. The level 2 cache is disabled by specifying 0 or 0mb. The element
Manual
14

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 Metamodel API

by the EntityManager's getMetamodel method (both methods are equivalent). For example, given an EntityManager, em, a Metamodel instance can be obtained by: Metamodel metamodel = em.getMetamodel
Result
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Posting to ObjectDB Website - Important Instructions

");         EntityManager em = emf.createEntityManager();         em.getTransaction().begin();         MyEntity e = new
Tutorial
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Step 3: Add a Main Class

.createEntityManagerFactory("$objectdb/db/p2.odb"); EntityManager em = emf.createEntityManager
Tutorial
10

Step 3: Add a Main Class

("$objectdb/db/p2.odb"); EntityManager em = emf.createEntityManager(); // Store 1000
Tutorial
10

Step 6: Set the Spring XML

, controllers and transactions), to inject a JPA EntityManager, to manage transactions and to look for JSP
Tutorial
10

Step 6: Set the Spring XML

, controllers and transactions), to inject a JPA EntityManager, to manage transactions and to look
Manual
10

JPA Named Queries

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