From beccf32be8bb458777f8c54b8e3aa4ad999e3301 Mon Sep 17 00:00:00 2001 From: Vivek Date: Sat, 13 Apr 2019 14:18:55 +0530 Subject: [PATCH] BAEL-2857 Defining a JPA Entity --- .../java/com/baeldung/jpa/entity/Student.java | 75 +++++++++++++++++ .../main/java/com/baeldung/util/Gender.java | 6 ++ .../main/resources/META-INF/persistence.xml | 20 +++++ .../entity/StudentEntityIntegrationTest.java | 83 +++++++++++++++++++ 4 files changed, 184 insertions(+) create mode 100644 persistence-modules/java-jpa/src/main/java/com/baeldung/jpa/entity/Student.java create mode 100644 persistence-modules/java-jpa/src/main/java/com/baeldung/util/Gender.java create mode 100644 persistence-modules/java-jpa/src/test/java/com/baeldung/jpa/entity/StudentEntityIntegrationTest.java diff --git a/persistence-modules/java-jpa/src/main/java/com/baeldung/jpa/entity/Student.java b/persistence-modules/java-jpa/src/main/java/com/baeldung/jpa/entity/Student.java new file mode 100644 index 0000000000..6eced20779 --- /dev/null +++ b/persistence-modules/java-jpa/src/main/java/com/baeldung/jpa/entity/Student.java @@ -0,0 +1,75 @@ +package com.baeldung.jpa.entity; + +import java.util.Date; + +import javax.persistence.Column; +import javax.persistence.Entity; +import javax.persistence.EnumType; +import javax.persistence.Enumerated; +import javax.persistence.GeneratedValue; +import javax.persistence.GenerationType; +import javax.persistence.Id; +import javax.persistence.Table; +import javax.persistence.Temporal; +import javax.persistence.TemporalType; +import javax.persistence.Transient; + +import com.baeldung.util.Gender; + +@Entity +@Table(name="STUD_NAME") +public class Student { + + @Id + @GeneratedValue(strategy = GenerationType.AUTO) + private Long id; + @Column(name = "STUD_NAME", length = 50, nullable = false, unique = false) + private String name; + @Transient + private Integer age; + @Temporal(TemporalType.DATE) + private Date birthDate; + @Enumerated(EnumType.STRING) + private Gender gender; + + public Long getId() { + return id; + } + + public void setId(Long id) { + this.id = id; + } + + public String getName() { + return name; + } + + public void setName(String name) { + this.name = name; + } + + public Integer getAge() { + return age; + } + + public void setAge(Integer age) { + this.age = age; + } + + public Date getBirthDate() { + return birthDate; + } + + public void setBirthDate(Date birthDate) { + this.birthDate = birthDate; + } + + public Gender getGender() { + return gender; + } + + public void setGender(Gender gender) { + this.gender = gender; + } + +} diff --git a/persistence-modules/java-jpa/src/main/java/com/baeldung/util/Gender.java b/persistence-modules/java-jpa/src/main/java/com/baeldung/util/Gender.java new file mode 100644 index 0000000000..13f08d995c --- /dev/null +++ b/persistence-modules/java-jpa/src/main/java/com/baeldung/util/Gender.java @@ -0,0 +1,6 @@ +package com.baeldung.util; + +public enum Gender { + MALE, + FEMALE +} diff --git a/persistence-modules/java-jpa/src/main/resources/META-INF/persistence.xml b/persistence-modules/java-jpa/src/main/resources/META-INF/persistence.xml index 5422afa4a3..2105a80d7d 100644 --- a/persistence-modules/java-jpa/src/main/resources/META-INF/persistence.xml +++ b/persistence-modules/java-jpa/src/main/resources/META-INF/persistence.xml @@ -129,5 +129,25 @@ + + + org.hibernate.jpa.HibernatePersistenceProvider + com.baeldung.jpa.entity.Student + true + + + + + + + + + + + \ No newline at end of file diff --git a/persistence-modules/java-jpa/src/test/java/com/baeldung/jpa/entity/StudentEntityIntegrationTest.java b/persistence-modules/java-jpa/src/test/java/com/baeldung/jpa/entity/StudentEntityIntegrationTest.java new file mode 100644 index 0000000000..2dc5d7c5f2 --- /dev/null +++ b/persistence-modules/java-jpa/src/test/java/com/baeldung/jpa/entity/StudentEntityIntegrationTest.java @@ -0,0 +1,83 @@ +package com.baeldung.jpa.entity; + +import static org.junit.Assert.assertEquals; + +import java.util.Date; +import java.util.List; + +import javax.persistence.EntityManager; +import javax.persistence.EntityManagerFactory; +import javax.persistence.Persistence; +import javax.persistence.TypedQuery; + +import org.junit.After; +import org.junit.Before; +import org.junit.Test; + +import com.baeldung.util.Gender; + +public class StudentEntityIntegrationTest { + + private EntityManagerFactory emf; + private EntityManager em; + + @Before + public void setup() { + emf = Persistence.createEntityManagerFactory("jpa-entity-definition"); + em = emf.createEntityManager(); + } + + @Test + public void persistStudentThenRetrieveTheDetails() { + Student student = createStudentWithRelevantDetails(); + persist(student); + clearThePersistenceContext(); + List students = getStudentsFromTable(); + checkAssertionsWith(students); + } + + @After + public void destroy() { + if (em != null) { + em.close(); + } + if (emf != null) { + emf.close(); + } + } + + private void clearThePersistenceContext() { + em.clear(); + } + + private void checkAssertionsWith(List students) { + assertEquals(1, students.size()); + Student john = students.get(0); + assertEquals(1L, john.getId().longValue()); + assertEquals(null, john.getAge()); + assertEquals("John", john.getName()); + } + + private List getStudentsFromTable() { + String selectQuery = "SELECT student FROM Student student"; + TypedQuery selectFromStudentTypedQuery = em.createQuery(selectQuery, Student.class); + List students = selectFromStudentTypedQuery.getResultList(); + return students; + } + + private void persist(Student student) { + em.getTransaction().begin(); + em.persist(student); + em.getTransaction().commit(); + } + + private Student createStudentWithRelevantDetails() { + Student student = new Student(); + student.setAge(20); // the 'age' field has been annotated with @Transient + student.setName("John"); + student.setBirthDate(new Date()); + student.setGender(Gender.MALE); + return student; + } + +}