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package test.util;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Query;
import javax.transaction.UserTransaction;
import test.entity.Department;
import test.entity.Employee;
public class JpaTest {
private EntityManager em;
private UserTransaction utx;
private static Department deptRef[] = new Department[2];
private static Employee empRef[] = new Employee[5];
public JpaTest() {
}
public JpaTest(EntityManager em, UserTransaction utx) {
this.em = em;
this.utx = utx;
}
public boolean lazyLoadingInit() {
boolean status = false;
System.out.println("-----lazeLoadingInit()---------");
try {
deptRef[0] = new Department(1, "Engineering");
deptRef[1] = new Department(2, "Marketing");
utx.begin();
em.joinTransaction();
for (int i = 0; i < 2; i++) {
em.persist(deptRef[i]);
}
utx.commit();
empRef[0] = new Employee(1, "Alan", "Frechette", deptRef[0]);
empRef[1] = new Employee(2, "Arthur", "Wesley", deptRef[0]);
empRef[2] = new Employee(3, "Abe", "White", deptRef[0]);
empRef[3] = new Employee(4, "Paul", "Hinz", deptRef[1]);
empRef[4] = new Employee(5, "Carla", "Calrson", deptRef[1]);
utx.begin();
em.joinTransaction();
for (int i = 0; i < 5; i++) {
em.persist(empRef[i]);
}
utx.commit();
status = true;
} catch (Exception ex) {
ex.printStackTrace();
}
System.out.println("-----status = " + status + "---------");
return status;
}
public boolean lazyLoadingByFind(int employeeID) {
boolean status = true;
System.out.println("------------lazyLoadingAfterFind -----------");
System.out.println("employeeID = " + employeeID);
Employee emp = em.find(Employee.class, employeeID);
System.out.println("found: emp.id=" + emp.getId());
try {
// 1. get Department before loading
Department deptBL = emp.getDepartmentNoWeaving();
System.out.println("1. before loading: deptBL=" + deptBL);
String deptNameBL = null;
if (deptBL != null) {
deptNameBL = deptBL.getName();
System.out.println("deptNameBL=" + deptNameBL);
}
// assert deptBL == null;
if (deptBL != null) {
status = false;
}
// 2. loading
String deptName = emp.getDepartment().getName();
System.out.println("2. loading, deptName = " + deptName);
// 3. get Department after loading
Department deptAL = emp.getDepartmentNoWeaving();
System.out.println("3. after loading: deptAL=" + deptAL);
String deptNameAL = deptAL.getName();
System.out.println("deptNameAL=" + deptNameAL);
// assert deptAL != null
// assert deptAL.getName == deptName;
if (deptAL == null || deptNameAL != deptName) {
status = false;
}
} catch (Exception ex) {
status = false;
ex.printStackTrace();
}
System.out.println("-----status = " + status + "---------");
return status;
}
public boolean lazyLoadingByQuery(String fName) {
boolean status = true;
System.out.println("------------lazyLoadingByQuery -----------");
System.out.println("fName = " + fName);
Query query = em.createQuery(
"SELECT e FROM Employee e WHERE e.firstName like :firstName")
.setParameter("firstName", fName);
;
Employee emp = (Employee) query.getSingleResult();
System.out.println("queried: emp.firstName=" + emp.getFirstName());
try {
// 1. get Department before loading
Department deptBL = emp.getDepartmentNoWeaving();
System.out.println("1. before loading: deptBL=" + deptBL);
String deptNameBL = null;
if (deptBL != null) {
deptNameBL = deptBL.getName();
System.out.println("deptNameBL=" + deptNameBL);
}
// assert deptBL == null;
if (deptBL != null) {
status = false;
}
// 2. loading
String deptName = emp.getDepartment().getName();
System.out.println("2. loading, deptName = " + deptName);
// 3. get Department after loading
Department deptAL = emp.getDepartmentNoWeaving();
System.out.println("3. after loading: deptAL=" + deptAL);
String deptNameAL = deptAL.getName();
System.out.println("deptNameAL=" + deptNameAL);
// assert deptAL != null
// assert deptAL.getName == deptName;
if (deptAL == null || deptNameAL != deptName) {
status = false;
}
} catch (Exception ex) {
status = false;
ex.printStackTrace();
}
System.out.println("-----status = " + status + "---------");
return status;
}
}