qr code generator javascript example | Appendix F: Java Persistence APIs: Employee Registry Example in Java

Creation QR Code in Java | Appendix F: Java Persistence APIs: Employee Registry Example

622 | Appendix F: Java Persistence APIs: Employee Registry Example
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pk.setLastName(lastName); pk.setSsn(ssn); final EmployeeWithExternalCompositePK roundtrip = em.find(Employee WithExternalCompositePK.class, pk); // Ensure found Assert.assertNotNull("Should have been able to look up record via a custom PK composite class", roundtrip); // Return return null;
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}); } catch (final TaskExecutionException tee) { // Unwrap throw tee.getCause(); }
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/** * Shows usage of an entity which gets its identity via an * {@link EmbeddedId} - {@link EmployeeWithEmbeddedPK} * @throws Throwable */ @Test public void embeddedCompositePrimaryKey() throws Throwable { try { txWrapper.wrapInTx(new Callable<Void>() { @Override public Void call() throws Exception { // Define the values to compose a primary key identity final String lastName = "Rubinger"; final Long ssn = 100L; // Not real ;) // Create a new Employee which uses an Embedded PK Class final EmployeeWithEmbeddedPK employee = new EmployeeWithEmbeddedPK final EmbeddedEmployeePK pk = new EmbeddedEmployeePK(); pk.setLastName(lastName); pk.setSsn(ssn); employee.setId(pk); // Persist final EntityManager em = emHook.getEntityManager(); em.persist(employee); log.info("Persisted: " + employee);
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// Now look up using our custom composite PK value class final EmployeeWithEmbeddedPK roundtrip = em.find(EmployeeWith EmbeddedPK.class, pk); // Ensure found Assert .assertNotNull("Should have been able to look up record via a custom embedded PK class", roundtrip); // Return return null;
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}); } catch (final TaskExecutionException tee) { // Unwrap throw tee.getCause(); }
/** * Shows usage of an entity with a series of nonstandard * mappings which require additional JPA metadata to show * the ORM layer how things should be represented in the DB. */ @Test public void propertyMappings() throws Throwable { // Define the values for our employee final byte[] image = new byte[] {0x00}; final Date since = new Date(0L); // Employed since the epoch final EmployeeType type = EmployeeType.PEON; final String currentAssignment = "Learn JPA and EJB!"; try {
final Long id = txWrapper.wrapInTx(new Callable<Long>() { @Override public Long call() throws Exception { // Create a new Employee final EmployeeWithProperties employee = new EmployeeWithProperties employee.setImage(image); employee.setSince(since); employee.setType(type); employee.setCurrentAssignment(currentAssignment);
();
624 | Appendix F: Java Persistence APIs: Employee Registry Example
// Persist final EntityManager em = emHook.getEntityManager(); em.persist(employee); log.info("Persisted: " + employee); // Get the ID, now that one's been assigned final Long id = employee.getId(); // Return return id;
} });
// Now execute in another Tx, to ensure we get a real DB load from the EM, // and not just a direct reference back to the object we persisted. txWrapper.wrapInTx(new Callable<Void>() { @Override public Void call() throws Exception { // Roundtrip lookup final EmployeeWithProperties roundtrip = emHook.getEntityManager() .find(EmployeeWithProperties.class, id); log.info("Roundtrip: " + roundtrip); final Calendar suppliedSince = Calendar.getInstance(); suppliedSince.setTime(since); final Calendar obtainedSince = Calendar.getInstance(); obtainedSince.setTime(roundtrip.getSince()); // Assert all values are as expected Assert.assertEquals("Binary object was not mapped properly", image [0], roundtrip.getImage()[0]); Assert.assertEquals("Temporal value was not mapped properly", suppliedSince.get(Calendar.YEAR), obtainedSince.get(Calendar.YEAR)); Assert.assertEquals("Temporal value was not mapped properly", suppliedSince.get(Calendar.MONTH), obtainedSince.get(Calendar.MONTH)); Assert.assertEquals("Temporal value was not mapped properly", suppliedSince.get(Calendar.DATE), obtainedSince.get(Calendar.DATE)); Assert.assertEquals("Enumerated value was not as expected", type, roundtrip.getType()); Assert.assertNull("Transient property should not have been persisted", roundtrip.getCurrentAssignment()); // Return return null;
} catch (final TaskExecutionException tee)
});
}
{ }
// Unwrap throw tee.getCause();
}
/** * Shows usage of the 1:1 Unidirectional Mapping Between * {@link Employee} and {@link Address} * @throws Throwable */ @Test public void oneToOneUnidirectionalMapping() throws Throwable { // Create a new Employee final Employee alrubinger = new Employee("Andrew Lee Rubinger"); // Create a new Address final Address address = new Address("1 JBoss Way", "Boston", "MA"); try {
// Persist and associate an Employee and Address final Long employeeId = txWrapper.wrapInTx(new Callable<Long>() { @Override public Long call() throws Exception { // Get the EM final EntityManager em = emHook.getEntityManager(); // Persist em.persist(alrubinger); em.persist(address); // Associate alrubinger.setAddress(address); // Return return alrubinger.getId();
} });
// Now ensure when we look up the Address again by Employee after Tx has completed, // all's as expected txWrapper.wrapInTx(new Callable<Void>() { @Override public Void call() throws Exception { // Get the EM
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