Fichier: Professeur.java import java.util.ArrayList; import java.util.Collection; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; import javax.persistence.ManyToMany; @Entity public class Professeur { @Id @GeneratedValue(strategy=GenerationType.IDENTITY) private int id; private String nom; private long salaire; @ManyToMany private Collection<Project> projects; public Professeur() { projects = new ArrayList<Project>(); } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getNom() { return nom; } public void setNom(String nom) { this.nom = nom; } public long getSalary() { return salaire; } public void setSalary(long salaire) { this.salaire = salaire; } public void addProject(Project project) { if (!getProjects().contains(project)) { getProjects().add(project); } if (!project.getProfesseurs().contains(this)) { project.getProfesseurs().add(this); } } public Collection<Project> getProjects() { return projects; } public String toString() { return "Professeur id: " + getId() + " nom: " + getNom() + " with " + getProjects().size() + " projects"; } } Fichier: ProfesseurService.java import java.util.Collection; import javax.persistence.EntityManager; import javax.persistence.Query; public class ProfesseurService { protected EntityManager em; public ProfesseurService(EntityManager em) { this.em = em; } public Professeur createProfesseur(String nom, long salaire) { Professeur emp = new Professeur(); emp.setNom(nom); emp.setSalary(salaire); em.persist(emp); return emp; } public Professeur addProfesseurProject(int empId, int projId) { Professeur emp = em.find(Professeur.class, empId); Project proj = em.find(Project.class, projId); proj.addProfesseur(emp); return emp; } public Collection<Professeur> findAllProfesseurs() { Query query = em.createQuery("SELECT e FROM Professeur e"); return (Collection<Professeur>) query.getResultList(); } public Project createProject(String nom) { Project proj = new Project(); proj.setNom(nom); em.persist(proj); return proj; } public Collection<Project> findAllProjects() { Query query = em.createQuery("SELECT p FROM Project p"); return (Collection<Project>) query.getResultList(); } } Fichier: Project.java import java.util.ArrayList; import java.util.Collection; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; import javax.persistence.ManyToMany; @Entity public class Project { @Id @GeneratedValue(strategy=GenerationType.IDENTITY) 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 void setId(int projectNo) { this.id = projectNo; } public String getNom() { return nom; } public void setNom(String projectNom) { this.nom = projectNom; } public Collection<Professeur> getProfesseurs() { return employees; } public void addProfesseur(Professeur employee) { if (!getProfesseurs().contains(employee)) { getProfesseurs().add(employee); } if (!employee.getProjects().contains(this)) { employee.getProjects().add(this); } } public String toString() { return "Project id: " + getId() + ", nom: " + getNom() + " with " + getProfesseurs().size() + " employees"; } } 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: Main.java import java.util.Collection; 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(); Professeur emp = service.createProfesseur("empNom", 100L); Project proj = service.createProject("projNom"); emp = service.addProfesseurProject(emp.getId(), proj.getId()); Collection<Professeur> emps = service.findAllProfesseurs(); if (emps.isEmpty()) { System.out.println("No Professeurs found "); } else { System.out.println("Found Professeurs:"); for (Professeur emp1 : emps) { System.out.println(emp1); } } Collection<Project> projs = service.findAllProjects(); if (projs.isEmpty()) { System.out.println("No Projects found "); } else { System.out.println("Found Projects:"); for (Project proj1 : projs) { System.out.println(proj1); } } util.checkData("select * from Professeur"); util.checkData("select * from Project"); em.getTransaction().commit(); em.close(); emf.close(); } } 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> |
Cet article Java Persistane: Rélation de Plusieur à plusieur Avec un Schéma bidirectionnel. est apparu en premier sur .