Johan

README.md

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+[![Review Assignment Due Date](https://classroom.github.com/assets/deadline-readme-button-22041afd0340ce965d47ae6ef1cefeee28c7c493a6346c4f15d667ab976d596c.svg)](https://classroom.github.com/a/_uV8Mn8f)
 # 📘 Projektarbete: JPA + Hibernate med GitHub-flöde
 
 Projektet genomförs som antingen en Java CLI-applikation eller med hjälp av JavaFX om ni vill ha ett grafiskt gränssnitt.
@@ -9,11 +10,11 @@ Kommunikation med databasen ska ske med JPA och Hibernate, enligt code first-met
 
 ## 🗓️ Veckoplanering med Checklista
 ### ✅ Vecka 1 – Grundläggning och struktur
-- [ ] Klona GitHub-repo
-- [ ] Konfigurera persistence.xml eller använd PersistenceConfiguration i kod
-- [ ] Skapa entiteter och verifiera tabellgenerering
-- [ ] Lägg till relationer (One-to-Many, Many-to-Many)
-- [ ] Arbeta på feature-branches och använd pull requests för kodgranskning
+- [x] Klona GitHub-repo
+- [x] Konfigurera persistence.xml eller använd PersistenceConfiguration i kod
+- [x] Skapa entiteter och verifiera tabellgenerering
+- [x] Lägg till relationer (One-to-Many, Many-to-Many)
+- [x] Arbeta på feature-branches och använd pull requests för kodgranskning
 
 ### ✅ Vecka 2 – Funktionalitet och relationer
 - [ ] Dela upp funktioner mellan gruppmedlemmar

src/main/java/Director.java

@@ -0,0 +1,76 @@
+import jakarta.persistence.*;
+
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+@Entity
+public class Director {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @OneToMany(mappedBy = "director")
+    private Set<Film> films = new HashSet<>();
+
+    private String name;
+    private String country;
+    private int birthYear;
+    @Column(nullable = true)
+    private Integer yearOfDeath;
+
+
+
+    public Set<Film> getFilms() {
+        return films;
+    }
+
+    public void setFilms(Set<Film> films) {
+        this.films = films;
+    }
+
+    public Integer getYearOfDeath() {
+        return yearOfDeath;
+    }
+
+    public void setYearOfDeath(Integer yearOfDeath) {
+        this.yearOfDeath = yearOfDeath;
+    }
+
+    public int getBirthYear() {
+        return birthYear;
+    }
+
+    public void setBirthYear(int birthYear) {
+        this.birthYear = birthYear;
+    }
+
+    public String getCountry() {
+        return country;
+    }
+
+    public void setCountry(String country) {
+        this.country = country;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+
+}
+
+

src/main/java/Film.java

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+import jakarta.persistence.*;
+
+@Entity
+public class Film {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    private String title;
+    @ManyToOne
+    @JoinColumn(name = "director_id")
+    private Director director;
+
+    public Director getDirector() {
+        return director;
+    }
+
+    public void setDirector(Director director) {
+        this.director = director;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+
+}

src/main/java/Main.java

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+import jakarta.persistence.Entity;
+import jakarta.persistence.EntityManagerFactory;
+import jakarta.persistence.Persistence;
+import jakarta.persistence.PersistenceConfiguration;
+import org.hibernate.jpa.HibernatePersistenceConfiguration;
+
+import java.util.List;
+
+public class Main {
+        public static void main(String[] args) {
+
+
+            final PersistenceConfiguration cfg = new HibernatePersistenceConfiguration("emf")
+                .jdbcUrl("jdbc:mysql://localhost:3306/film_database")
+                .jdbcUsername("root")
+                .jdbcPassword("root")
+                .property("hibernate.hbm2ddl.auto", "update")
+                .property("hibernate.show_sql", "true")
+                .property("hibernate.format_sql", "true")
+                .property("hibernate.highlight_sql", "true")
+                .managedClasses(Film.class, Director.class);
+            try (EntityManagerFactory emf = cfg.createEntityManagerFactory()) {
+                emf.runInTransaction(em -> {
+                    //If no Films in database, add some
+                    if (em.createQuery("select count(o) from Film o", Long.class)
+                        .getSingleResult() == 0) {
+                        Film film1 = new Film();
+                        em.persist(film1);
+                        em.flush();
+                        Film film2 = new Film();
+                        em.persist(film2);
+                    }
+                    System.out.println("==== Using select query, N + 1 ====");
+                    em.createQuery("from Film", Film.class)
+                        .getResultList().forEach(System.out::println);
+
+                });
+
+            }
+
+        }
+}

src/main/java/org/example/BaseEntity.java

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+package org.example;
+
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.MappedSuperclass;
+
+@MappedSuperclass
+public abstract class BaseEntity {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    public Long getId() {
+        return id;
+    }
+
+}

src/main/java/org/example/BaseRepositoryImpl.java

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+package org.example;
+
+import jakarta.persistence.EntityManager;
+
+import java.util.Optional;
+
+public class BaseRepositoryImpl<T extends org.example.BaseEntity> implements Repository<T> {
+
+    protected EntityManager em;
+    protected Class<T> entityClass;
+
+
+    public BaseRepositoryImpl(EntityManager em, Class<T> entityClass) {
+        this.em = em;
+        this.entityClass = entityClass;
+    }
+
+
+    public T save(T entity) {
+        if (entity == null) {
+
+                throw new IllegalArgumentException("Entity cannot be null");
+            }
+            if (entity.getId() == null) {
+                em.persist(entity);
+                return entity;
+            }
+        else {
+            return em.merge(entity);
+        }
+    }
+
+
+
+    public EntityManager  getEntityManager() {
+        return em;
+    }
+
+    @Override
+    public Optional<T> findById(Long id) {
+        return Optional.ofNullable(em.find(entityClass, id));
+    }
+
+    @Override
+    public void delete(T entity) {
+        em.remove(em.contains(entity) ? entity : em.merge(entity));
+    }
+
+    @Override
+    public void deleteById(Long id) {
+        T entity = em.find(entityClass, id);
+        if (entity != null) {
+            em.remove(entity);
+        }
+    }
+
+    @Override
+    public Iterable<T> findAll() {
+        return em.createQuery(
+            "select e from " + entityClass.getSimpleName() + " e", entityClass
+        ).getResultList();
+    }
+
+    @Override
+    public boolean existsById(Long id) {
+        Long count = em.createQuery(
+            "select count(e) from " + entityClass.getSimpleName() + " e where e.id = :id",
+            Long.class
+        ).setParameter("id", id).getSingleResult();
+        return count > 0;
+
+    }
+
+    @Override
+    public long count() {
+
+        return em.createQuery("select count(e) from " + entityClass.getSimpleName() + " e", Long.class).getSingleResult();
+    }
+
+    @Override
+    public void flush() {
+        em.flush();
+    }
+
+    @Override
+    public void clear() {
+        em.clear();
+    }
+
+}

src/main/java/org/example/BusinessException.java

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+package org.example;
+
+public class BusinessException extends Throwable {
+    public BusinessException(String s) {
+    }
+}