Merge pull request #5876 from the-java-guy/master

BAEL-2343

persistence-modules/hibernate5/src/main/java/com/baeldung/hibernate/operations/HibernateOperations.java

@@ -0,0 +1,114 @@
+package com.baeldung.hibernate.operations;
+
+import java.util.List;
+
+import javax.persistence.EntityManager;
+import javax.persistence.EntityManagerFactory;
+import javax.persistence.Persistence;
+
+import com.baeldung.hibernate.pojo.Movie;
+
+/**
+ * 
+ *Class to illustrate the usage of EntityManager API.
+ */
+public class HibernateOperations {
+
+    private static final EntityManagerFactory emf;
+
+    /**
+     * Static block for creating EntityManagerFactory. The Persistence class looks for META-INF/persistence.xml in the classpath.
+     */
+    static {
+        emf = Persistence.createEntityManagerFactory("com.baeldung.movie_catalog");
+    }
+
+    /**
+     * Static method returning EntityManager.
+     * @return EntityManager
+     */
+    public static EntityManager getEntityManager() {
+        return emf.createEntityManager();
+    }
+
+    /**
+     * Saves the movie entity into the database. Here we are using Application Managed EntityManager, hence should handle transactions by ourselves.
+     */
+    public void saveMovie() {
+        EntityManager em = HibernateOperations.getEntityManager();
+        em.getTransaction()
+            .begin();
+        Movie movie = new Movie();
+        movie.setId(1L);
+        movie.setMovieName("The Godfather");
+        movie.setReleaseYear(1972);
+        movie.setLanguage("English");
+        em.persist(movie);
+        em.getTransaction()
+            .commit();
+    }
+
+    /**
+     * Method to illustrate the querying support in EntityManager when the result is a single object.
+     * @return Movie
+     */
+    public Movie queryForMovieById() {
+        EntityManager em = HibernateOperations.getEntityManager();
+        Movie movie = (Movie) em.createQuery("SELECT movie from Movie movie where movie.id = ?1")
+            .setParameter(1, new Long(1L))
+            .getSingleResult();
+        return movie;
+    }
+
+    /**
+     * Method to illustrate the querying support in EntityManager when the result is a list.
+     * @return
+     */
+    public List<?> queryForMovies() {
+        EntityManager em = HibernateOperations.getEntityManager();
+        List<?> movies = em.createQuery("SELECT movie from Movie movie where movie.language = ?1")
+            .setParameter(1, "English")
+            .getResultList();
+        return movies;
+    }
+
+    /**
+     * Method to illustrate the usage of find() method.
+     * @param movieId
+     * @return Movie
+     */
+    public Movie getMovie(Long movieId) {
+        EntityManager em = HibernateOperations.getEntityManager();
+        Movie movie = em.find(Movie.class, new Long(movieId));
+        return movie;
+    }
+
+    /**
+     * Method to illustrate the usage of merge() function.
+     */
+    public void mergeMovie() {
+        EntityManager em = HibernateOperations.getEntityManager();
+        Movie movie = getMovie(1L);
+        em.detach(movie);
+        movie.setLanguage("Italian");
+        em.getTransaction()
+            .begin();
+        em.merge(movie);
+        em.getTransaction()
+            .commit();
+    }
+
+    /**
+     * Method to illustrate the usage of remove() function.
+     */
+    public void removeMovie() {
+        EntityManager em = HibernateOperations.getEntityManager();
+        em.getTransaction()
+            .begin();
+        Movie movie = em.find(Movie.class, new Long(1L));
+        em.remove(movie);
+        em.getTransaction()
+            .commit();
+    }
+
+}

persistence-modules/hibernate5/src/main/java/com/baeldung/hibernate/pojo/Movie.java

@@ -0,0 +1,52 @@
+package com.baeldung.hibernate.pojo;
+
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.Table;
+
+@Entity
+@Table(name = "MOVIE")
+public class Movie {
+
+    @Id
+    private Long id;
+
+    private String movieName;
+
+    private Integer releaseYear;
+
+    private String language;
+
+    public String getMovieName() {
+        return movieName;
+    }
+
+    public void setMovieName(String movieName) {
+        this.movieName = movieName;
+    }
+
+    public Integer getReleaseYear() {
+        return releaseYear;
+    }
+
+    public void setReleaseYear(Integer releaseYear) {
+        this.releaseYear = releaseYear;
+    }
+
+    public String getLanguage() {
+        return language;
+    }
+
+    public void setLanguage(String language) {
+        this.language = language;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+}

persistence-modules/hibernate5/src/main/resources/META-INF/persistence.xml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<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_2_0.xsd"
+             version="2.0">
+    <persistence-unit name="com.baeldung.movie_catalog">
+        <description>Hibernate EntityManager Demo</description>
+        <class>com.baeldung.hibernate.pojo.Movie</class> 
+        <exclude-unlisted-classes>true</exclude-unlisted-classes>
+        <properties>
+            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect"/>
+            <property name="hibernate.hbm2ddl.auto" value="update"/>
+            <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
+            <property name="javax.persistence.jdbc.url" value="jdbc:mysql://127.0.0.1:3306/moviecatalog"/>
+            <property name="javax.persistence.jdbc.user" value="root"/>
+            <property name="javax.persistence.jdbc.password" value="root"/>
+        </properties>
+    </persistence-unit>
+</persistence>