Merge pull request #2 from ithsjava25/feature

Ok by group

Author: Linnea Vardal

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

@@ -0,0 +1,39 @@
+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

@@ -0,0 +1,42 @@
+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);
+
+                });
+
+            }
+
+        }
+}