File: Professor.java
import static javax.persistence.EnumType.STRING;
import javax.persistence.Entity;
import javax.persistence.Enumerated;
import javax.persistence.Id;
@Entity
public class Professor {
@Id
private int id;
private String name;
private long salary;
private ProfessorType type;
@Enumerated(STRING)
private ProfessorType previousType;
public Professor() {
}
public Professor(int id) {
this.id = id;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public long getSalary() {
return salary;
}
public void setSalary(long salary) {
this.salary = salary;
}
public ProfessorType getType() {
return type;
}
public void setType(ProfessorType type) {
this.previousType = this.type;
if (this.previousType == null) {
this.previousType = type;
}
this.type = type;
}
public ProfessorType getPreviousType() {
return previousType;
}
public String toString() {
return "Professor id: " + getId() + " name: " + getName() + " salary: " + getSalary();
}
}
File: ProfessorService.java
import java.util.Collection;
import javax.persistence.EntityManager;
import javax.persistence.Query;
public class ProfessorService {
protected EntityManager em;
public ProfessorService(EntityManager em) {
this.em = em;
}
public Professor createProfessor(int id, String name, long salary, ProfessorType type) {
Professor emp = new Professor(id);
emp.setName(name);
emp.setSalary(salary);
emp.setType(type);
em.persist(emp);
return emp;
}
public void removeProfessor(int id) {
Professor emp = findProfessor(id);
if (emp != null) {
em.remove(emp);
}
}
public Professor raiseProfessorSalary(int id, long raise) {
Professor emp = em.find(Professor.class, id);
if (emp != null) {
emp.setSalary(emp.getSalary() + raise);
}
return emp;
}
public Professor findProfessor(int id) {
return em.find(Professor.class, id);
}
public Collection findAllProfessors() {
Query query = em.createQuery("SELECT e FROM Professor e");
return (Collection) query.getResultList();
}
}
File: ProfessorType.java
public enum ProfessorType {
FULL_TIME_EMPLOYEE, PART_TIME_EMPLOYEE, CONTRACT_EMPLOYEE
}
File: Main.java
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
public class Main {
public static void main(String[] a) throws Exception {
JPAUtil util = new JPAUtil();
EntityManagerFactory emf = Persistence.createEntityManagerFactory("ProfessorService");
EntityManager em = emf.createEntityManager();
ProfessorService service = new ProfessorService(em);
em.getTransaction().begin();
Professor emp = service.createProfessor(158, "AAA", 45000,ProfessorType.CONTRACT_EMPLOYEE);
em.getTransaction().commit();
System.out.println("Persisted " + emp);
util.checkData("select * from Professor");
// remove an employee
em.getTransaction().begin();
service.removeProfessor(158);
em.getTransaction().commit();
System.out.println("Removed Professor 158");
util.checkData("select * from Professor");
em.close();
emf.close();
}
}
File: JPAUtil.java
import java.io.Reader;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.Statement;
public class JPAUtil {
Statement st;
public JPAUtil() throws Exception{
Class.forName("org.hsqldb.jdbcDriver");
System.out.println("Driver Loaded.");
String url = "jdbc:hsqldb:data/tutorial";
Connection conn = DriverManager.getConnection(url, "sa", "");
System.out.println("Got Connection.");
st = conn.createStatement();
}
public void executeSQLCommand(String sql) throws Exception {
st.executeUpdate(sql);
}
public void checkData(String sql) throws Exception {
ResultSet rs = st.executeQuery(sql);
ResultSetMetaData metadata = rs.getMetaData();
for (int i = 0; i < metadata.getColumnCount(); i++) {
System.out.print("\t"+ metadata.getColumnLabel(i + 1));
}
System.out.println("\n----------------------------------");
while (rs.next()) {
for (int i = 0; i < metadata.getColumnCount(); i++) {
Object value = rs.getObject(i + 1);
if (value == null) {
System.out.print("\t ");
} else {
System.out.print("\t"+value.toString().trim());
}
}
System.out.println("");
}
}
}
File: persistence.xml
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence" version="1.0">
JPA-MapEnum.zip( 5,334 k)