Fichier: Professeur.java import java.util.ArrayList; import java.util.Collection; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.OneToMany; @Entity public class Professeur { @Id private int id; private String nom; @OneToMany(mappedBy="employee") private Collection<ProjectAssignment> assignments; public Professeur() { assignments = new ArrayList<ProjectAssignment>(); } 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 Collection<ProjectAssignment> getAssignments() { return assignments; } public String toString() { return "Professeur id: " + getId() + " nom: " + getNom(); } } Fichier: ProfesseurService.java import java.util.Collection; import java.util.Date; import javax.persistence.EntityManager; import javax.persistence.Query; public class ProfesseurService { protected EntityManager em; public ProfesseurService(EntityManager em) { this.em = em; } public Project createProject(String nom, int id) { Project emp = new Project(); emp.setId(id); emp.setNom(nom); em.persist(emp); return emp; } public Professeur createProfesseur(String country, int id, String nom) { Professeur emp = new Professeur(); emp.setId(id); emp.setNom(nom); em.persist(emp); return emp; } public void addProfesseurProject(int id, int projId) { Professeur emp = findProfesseur(id); Project proj = em.find(Project.class, projId); ProjectAssignment assign = new ProjectAssignment(emp, proj); em.persist(assign); emp.getAssignments().add(assign); proj.getAssignments().add(assign); } public Professeur findProfesseur(int id) { return em.find(Professeur.class, id); } public Collection<Professeur> findAllProfesseurs() { Query query = em.createQuery("SELECT e FROM Professeur e"); return (Collection<Professeur>) query.getResultList(); } 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.Id; import javax.persistence.OneToMany; @Entity public class Project { @Id private int id; private String nom; @OneToMany(mappedBy="project") private Collection<ProjectAssignment> assignments; public Project() { assignments = new ArrayList<ProjectAssignment>(); } 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<ProjectAssignment> getAssignments() { return assignments; } public String toString() { return getClass().getNom().substring(getClass().getNom().lastIndexOf('.')+1) + " no: " + getId() + ", nom: " + getNom(); } } Fichier: ProjectAssignment.java import java.util.Date; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.IdClass; import javax.persistence.JoinColumn; import javax.persistence.ManyToOne; import javax.persistence.Table; import javax.persistence.Temporal; import javax.persistence.TemporalType; @Entity @Table(nom = "EMP_PROJECT") @IdClass(ProjectAssignmentId.class) public class ProjectAssignment { @Id @Column(nom = "EMP_ID", insertable = false, updatable = false) private int empId; @Id @Column(nom = "PROJECT_ID", insertable = false, updatable = false) private int projectId; @ManyToOne @JoinColumn(nom = "EMP_ID") Professeur employee; @ManyToOne @JoinColumn(nom = "PROJECT_ID") Project project; public ProjectAssignment() { } public ProjectAssignment(Professeur emp, Project proj) { this.empId = emp.getId(); this.employee = emp; this.projectId = proj.getId(); this.project = proj; } public int getEmpId() { return empId; } public Professeur getProfesseur() { return employee; } public int getProjectId() { return projectId; } public Project getProject() { return project; } } Fichier: ProjectAssignmentId.java import java.io.Serializable; public class ProjectAssignmentId implements Serializable { private int empId; private int projectId; public ProjectAssignmentId() {} public ProjectAssignmentId(int empId, int projectId) { this.empId = empId; this.projectId = projectId; } public int getEmpId() { return empId; } public int getProjectId() { return projectId; } public boolean equals(Object o) { return ((o instanceof ProjectAssignmentId) && empId == ((ProjectAssignmentId)o).getEmpId() && projectId == ((ProjectAssignmentId) o).getProjectId()); } public int hashCode() { return empId + projectId; } } 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 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.createProject("proj", 1); service.createProfesseur("country", 1, "nom"); service.addProfesseurProject(1, 1); System.out.println("Professeurs:"); for (Professeur emp : service.findAllProfesseurs()) { System.out.print(emp + " with " + emp.getAssignments().size() + " assignments"); } System.out.println("Projects:"); for (Project p : service.findAllProjects()) { System.out.print(p + " with " + p.getAssignments().size() + " assignments"); } 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> |
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