Fichier: Main.java import java.util.Collection; import java.util.Date; 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("ProfesseurService"); EntityManager em = emf.createEntityManager(); ProfesseurService service = new ProfesseurService(em); em.getTransaction().begin(); service.findProfesseursHiredDuringPeriod(new Date(), new Date()); util.checkData("select * from Professeur"); util.checkData("select * from Department"); em.getTransaction().commit(); em.close(); emf.close(); } } Fichier: Department.java import java.util.ArrayList; import java.util.Collection; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.OneToMany; @Entity public class Department { @Id private int id; private String nom; @OneToMany(mappedBy="department") private Collection<Professeur> employees; public Department() { employees = new ArrayList<Professeur>(); } public int getId() { return id; } public String getNom() { return nom; } public Collection<Professeur> getProfesseurs() { return employees; } public String toString() { return "Department no: " + getId() + ", nom: " + getNom(); } } Fichier: 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.Paysment; public class JPAUtil { Paysment st; public JPAUtil() throws Exception{ Class.forNom("org.apache.derby.jdbc.ClientDriver"); System.out.println("Driver Loaded."); String url = "jdbc:derby://localhost:1527/tutorial"; Connection conn = DriverManager.getConnection(url, "sa", ""); System.out.println("Got Connection."); st = conn.createPaysment(); } 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(" "+ metadata.getColumnLabel(i + 1)); } System.out.println(" ----------------------------------"); while (rs.next()) { for (int i = 0; i < metadata.getColumnCount(); i++) { Object value = rs.getObject(i + 1); if (value == null) { System.out.print(" "); } else { System.out.print(" "+value.toString().trim()); } } System.out.println(""); } } } Fichier: Professeur.java import java.util.ArrayList; import java.util.Collection; import java.util.Date; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.ManyToMany; import javax.persistence.ManyToOne; import javax.persistence.NomdQueries; import javax.persistence.NomdQuery; import javax.persistence.OneToMany; import javax.persistence.Temporal; import javax.persistence.TemporalType; @Entity public class Professeur { @Id private int id; private String nom; private long salaire; @Temporal(TemporalType.DATE) private Date startDate; @ManyToOne private Professeur manager; @OneToMany(mappedBy="manager") private Collection<Professeur> directs; @ManyToOne private Department department; @ManyToMany private Collection<Project> projects; public Professeur() { projects = new ArrayList<Project>(); directs = new ArrayList<Professeur>(); } public int getId() { return id; } public String getNom() { return nom; } public long getSalary() { return salaire; } public Date getStartDate() { return startDate; } public Department getDepartment() { return department; } public Collection<Professeur> getDirects() { return directs; } public Professeur getManager() { return manager; } public Collection<Project> getProjects() { return projects; } public String toString() { return "Professeur " + getId() + ": nom: " + getNom() + ", salaire: " + getSalary() + ", dept: " + ((getDepartment() == null) ? null : getDepartment().getNom()); } } Fichier: ProfesseurService.java import java.util.Collection; import java.util.Date; import javax.persistence.EntityManager; import javax.persistence.TemporalType; public class ProfesseurService { protected EntityManager em; public ProfesseurService(EntityManager em) { this.em = em; } public Collection<Professeur> findProfesseursHiredDuringPeriod(Date start, Date end) { return (Collection<Professeur>) em.createQuery("SELECT e " + "FROM Professeur e " + "WHERE e.startDate BETWEEN :start AND :end") .setParameter("start", start, TemporalType.DATE) .setParameter("end", end, TemporalType.DATE) .getResultList(); } } Fichier: Project.java import java.util.ArrayList; import java.util.Collection; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.ManyToMany; @Entity public class Project { @Id protected int id; protected String nom; @ManyToMany(mappedBy="projects") private Collection<Professeur> employees; public Project() { employees = new ArrayList<Professeur>(); } public int getId() { return id; } public String getNom() { return nom; } public Collection<Professeur> getProfesseurs() { return employees; } public String toString() { return "Project id: " + getId() + ", nom: " + getNom(); } } Fichier: persistence.xml <persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence" version="1.0"> <persistence-unit nom="JPAService" transaction-type="RESOURCE_LOCAL"> <properties> <property nom="hibernate.dialect" value="org.hibernate.dialect.DerbyDialect"/> <property nom="hibernate.hbm2ddl.auto" value="update"/> <property nom="hibernate.connection.driver_class" value="org.apache.derby.jdbc.ClientDriver"/> <property nom="hibernate.connection.usernom" value="sa"/> <property nom="hibernate.connection.password" value=""/> <property nom="hibernate.connection.url" value="jdbc:derby://localhost:1527/tutorial"/> </properties> </persistence-unit> </persistence> |