example code for BAEL-2849 (#6701)

* added example code for BAEL-2083

* updated example code for BAEL-2083

* added example code for BAEL-2849

persistence-modules/spring-boot-h2/spring-boot-h2-database/src/main/java/com/baeldung/h2db/springboot/SpringBootH2Application.java

@@ -0,0 +1,12 @@
+package com.baeldung.h2db.springboot;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class SpringBootH2Application {
+
+    public static void main(String... args) {
+        SpringApplication.run(SpringBootH2Application.class, args);
+    }
+}

persistence-modules/spring-boot-h2/spring-boot-h2-database/src/main/java/com/baeldung/h2db/springboot/daos/UserRepository.java

@@ -0,0 +1,10 @@
+package com.baeldung.h2db.springboot.daos;
+
+
+
+
+import com.baeldung.h2db.springboot.models.User;
+import org.springframework.data.repository.CrudRepository;
+
+public interface UserRepository extends CrudRepository<User, Integer> {
+}

persistence-modules/spring-boot-h2/spring-boot-h2-database/src/main/java/com/baeldung/h2db/springboot/models/User.java

@@ -0,0 +1,54 @@
+package com.baeldung.h2db.springboot.models;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+import javax.persistence.Table;
+
+@Table(name = "users")
+@Entity
+public class User {
+
+    @Id
+    @GeneratedValue
+    private int id;
+
+    private String firstName;
+
+    private String lastName;
+
+    public User() { }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    @Override
+    public String toString() {
+        return "User{" +
+                "id=" + id +
+                ", firstName='" + firstName + '\'' +
+                ", lastName='" + lastName + '\'' +
+                '}';
+    }
+}

persistence-modules/spring-boot-h2/spring-boot-h2-database/src/main/resources/application.properties

@@ -2,7 +2,7 @@ spring.datasource.url=jdbc:h2:mem:mydb
 spring.datasource.driverClassName=org.h2.Driver
 spring.datasource.username=sa
 spring.datasource.password=
-spring.jpa.hibernate.ddl-auto=create
+spring.jpa.hibernate.ddl-auto=create-drop
 spring.h2.console.enabled=true
 spring.h2.console.path=/h2-console
 debug=true

persistence-modules/spring-boot-h2/spring-boot-h2-database/src/test/java/com/baeldung/SpringBootH2IntegrationTest.java

@@ -0,0 +1,50 @@
+package com.baeldung;
+
+import com.baeldung.h2db.springboot.SpringBootH2Application;
+import com.baeldung.h2db.springboot.daos.UserRepository;
+import com.baeldung.h2db.springboot.models.User;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import java.util.List;
+
+import static org.junit.Assert.*;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes = SpringBootH2Application.class)
+public class SpringBootH2IntegrationTest {
+
+    @Autowired
+    private UserRepository userRepository;
+
+    @Test
+    public void contextLoads() { }
+
+    @Test
+    public void givenUserProfile_whenAddUser_thenCreateNewUser() {
+        User user = new User();
+        user.setFirstName("John");
+        user.setLastName("Doe");
+        userRepository.save(user);
+        List<User> users = (List<User>) userRepository.findAll();
+        assertFalse(users.isEmpty());
+
+        String firstName = "Aliko";
+        String lastName = "Dangote";
+        User user1 = userRepository.findById(users.get(0).getId()).get();
+        user1.setLastName(lastName);
+        user1.setFirstName(firstName);
+        userRepository.save(user1);
+
+        user = userRepository.findById(user.getId()).get();
+        assertEquals(user.getFirstName(), firstName);
+        assertEquals(user.getLastName(), lastName);
+
+        userRepository.deleteById(user.getId());
+        assertTrue( ((List<User>) userRepository.findAll()).isEmpty());
+    }
+
+}