JpaTest.java revision ada1678a4262b208a7b87391f520a7767d25287c
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package myapp;
import javax.persistence.*;
import javax.transaction.*;
import java.io.*;
public class JpaTest {
private EntityManagerFactory emf;
private EntityManager em;
private UserTransaction utx;
PrintWriter out;
private static Department deptRef[] = new Department[2];
private static Employee empRef[] = new Employee[5];
public JpaTest(){}
public JpaTest(EntityManagerFactory emf, EntityManager em,
UserTransaction utx, PrintWriter out){
this.emf = emf;
this.em = em;
this.utx = utx;
this.out = out;
}
protected boolean lazyLoadingInit(){
boolean status = false;
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();
}
out.println("-----status = " + status + "---------");
return status;
}
public boolean lazyLoadingByFind(int employeeID) {
boolean status=true;
out.println("------------lazyLoadingAfterFind -----------");
out.println("employeeID = "+ employeeID);
Employee emp = em.find(Employee.class, employeeID);
out.println("found: emp.id=" + emp.getId());
try {
// 1. get Department before loading
Department deptBL = emp.getDepartmentNoWeaving();
out.println("1. before loading: deptBL="+deptBL);
String deptNameBL = null;
if (deptBL != null) {
deptNameBL = deptBL.getName();
out.println("deptNameBL="+deptNameBL);
}
// assert deptBL == null;
if (deptBL != null) {
status = false;
}
// 2. loading
String deptName = emp.getDepartment().getName();
out.println("2. loading, deptName = " + deptName);
// 3. get Department after loading
Department deptAL = emp.getDepartmentNoWeaving();
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();
}
out.println("-----status = " + status + "---------");
return status;
}
public boolean lazyLoadingByQuery(String fName) {
boolean status=true;
out.println("------------lazyLoadingByQuery -----------");
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();
out.println("queried: emp.firstName=" + emp.getFirstName());
try {
// 1. get Department before loading
Department deptBL = emp.getDepartmentNoWeaving();
out.println("1. before loading: deptBL="+deptBL);
String deptNameBL = null;
if (deptBL != null) {
deptNameBL = deptBL.getName();
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();
out.println("3. after loading: deptAL="+deptAL);
String deptNameAL = deptAL.getName();
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();
}
out.println("-----status = " + status + "---------");
return status;
}
}