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[sequence-h2] h2 sequence (#18649)
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‎persistence-modules/spring-boot-persistence-h2-2/src/main/java/com/baeldung/h2seq/Book.java

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package com.baeldung.h2seq;
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import jakarta.persistence.Entity;
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import jakarta.persistence.GeneratedValue;
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import jakarta.persistence.GenerationType;
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import jakarta.persistence.Id;
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import jakarta.persistence.SequenceGenerator;
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import jakarta.persistence.Table;
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@Entity
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@Table(name = "book")
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class Book {
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@Id
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@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "book_seq_gen")
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@SequenceGenerator(name = "book_seq_gen", sequenceName = "book_seq", allocationSize = 1)
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private Long id;
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private String title;
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public Book() {
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}
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public Book(String title) {
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this.title = title;
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}
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public Long getId() {
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return id;
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}
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public void setId(Long id) {
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this.id = id;
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}
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public String getTitle() {
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return title;
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}
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public void setTitle(String title) {
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this.title = title;
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}
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}

‎persistence-modules/spring-boot-persistence-h2-2/src/main/java/com/baeldung/h2seq/H2SeqDemoApplication.java

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package com.baeldung.h2seq;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.boot.autoconfigure.domain.EntityScan;
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@SpringBootApplication
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public class H2SeqDemoApplication {
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public static void main(String... args) {
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SpringApplication.run(H2SeqDemoApplication.class, args);
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}
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}

‎persistence-modules/spring-boot-persistence-h2-2/src/test/java/com/baeldung/h2seq/H2SeqAsOracleDemoIntegrationTest.java

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package com.baeldung.h2seq;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.assertTrue;
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import java.math.BigDecimal;
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import org.junit.jupiter.api.Test;
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import org.junit.jupiter.api.extension.ExtendWith;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.boot.test.context.SpringBootTest;
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import org.springframework.test.context.ActiveProfiles;
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import org.springframework.test.context.junit.jupiter.SpringExtension;
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import org.springframework.transaction.annotation.Transactional;
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import jakarta.persistence.EntityManager;
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@ExtendWith(SpringExtension.class)
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@SpringBootTest(classes = H2SeqDemoApplication.class)
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@ActiveProfiles("h2-seq-oracle")
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@Transactional
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public class H2SeqAsOracleDemoIntegrationTest {
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@Autowired
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private EntityManager entityManager;
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@Test
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void whenCreateH2SequenceWithDefaultOptions_thenGetExpectedNextValueFromSequence() {
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entityManager.createNativeQuery("CREATE SEQUENCE my_seq")
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.executeUpdate();
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String sqlNextValueFor = "SELECT NEXT VALUE FOR my_seq";
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BigDecimal nextValueH2 = (BigDecimal) entityManager.createNativeQuery(sqlNextValueFor)
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.getSingleResult();
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assertEquals(0, BigDecimal.ONE.compareTo(nextValueH2));
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String sqlNextValueOralceStyle = "SELECT my_seq.nextval FROM dual";
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BigDecimal nextValueOracle = (BigDecimal) entityManager.createNativeQuery(sqlNextValueOralceStyle)
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.getSingleResult();
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assertEquals(0, BigDecimal.TWO.compareTo(nextValueOracle));
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String sqlNextValueFunction = "SELECT nextval('my_seq')";
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nextValueOracle = (BigDecimal) entityManager.createNativeQuery(sqlNextValueFunction)
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.getSingleResult();
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assertEquals(0, BigDecimal.valueOf(3)
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.compareTo(nextValueOracle));
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entityManager.createNativeQuery("DROP SEQUENCE my_seq")
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.executeUpdate();
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}
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}

‎persistence-modules/spring-boot-persistence-h2-2/src/test/java/com/baeldung/h2seq/H2SeqDemoIntegrationTest.java

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package com.baeldung.h2seq;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.assertNull;
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import org.junit.jupiter.api.Test;
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import org.junit.jupiter.api.extension.ExtendWith;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.boot.test.context.SpringBootTest;
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import org.springframework.test.context.ActiveProfiles;
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import org.springframework.test.context.junit.jupiter.SpringExtension;
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import org.springframework.transaction.annotation.Transactional;
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import jakarta.persistence.EntityManager;
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@ExtendWith(SpringExtension.class)
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@SpringBootTest(classes = H2SeqDemoApplication.class)
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@ActiveProfiles("h2-seq")
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@Transactional
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public class H2SeqDemoIntegrationTest {
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@Autowired
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private EntityManager entityManager;
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private final String sqlNextValueFor = "SELECT NEXT VALUE FOR my_seq";
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private final String sqlNextValueFunction = "SELECT nextval('my_seq')";
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@Test
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void whenCreateH2SequenceWithDefaultOptions_thenGetExpectedNextValueFromSequence() {
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entityManager.createNativeQuery("CREATE SEQUENCE my_seq")
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.executeUpdate();
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Long nextValue = (Long) entityManager.createNativeQuery(sqlNextValueFunction)
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.getSingleResult();
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assertEquals(1, nextValue);
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nextValue = (Long) entityManager.createNativeQuery(sqlNextValueFor)
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.getSingleResult();
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assertEquals(2, nextValue);
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nextValue = (Long) entityManager.createNativeQuery(sqlNextValueFunction)
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.getSingleResult();
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assertEquals(3, nextValue);
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entityManager.createNativeQuery("DROP SEQUENCE my_seq")
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.executeUpdate();
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}
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@Test
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void whenCustomizeH2Sequence_thenGetExpectedNextValueFromSequence() {
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entityManager.createNativeQuery("CREATE SEQUENCE my_seq START WITH 1000 INCREMENT BY 10")
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.executeUpdate();
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Long nextValue = (Long) entityManager.createNativeQuery(sqlNextValueFor)
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.getSingleResult();
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assertEquals(1000, nextValue);
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nextValue = (Long) entityManager.createNativeQuery(sqlNextValueFunction)
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.getSingleResult();
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assertEquals(1010, nextValue);
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nextValue = (Long) entityManager.createNativeQuery(sqlNextValueFor)
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.getSingleResult();
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assertEquals(1020, nextValue);
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entityManager.createNativeQuery("DROP SEQUENCE my_seq")
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.executeUpdate();
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}
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@Test
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void whenSaveEntityUsingSequence_thenCorrect() {
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entityManager.createNativeQuery("CREATE SEQUENCE book_seq")
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.executeUpdate();
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Book book1 = new Book("book1");
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assertNull(book1.getId());
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entityManager.persist(book1);
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assertEquals(1, book1.getId());
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Book book2 = new Book("book2");
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entityManager.persist(book2);
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assertEquals(2, book2.getId());
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}
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}

‎persistence-modules/spring-boot-persistence-h2-2/src/test/resources/application-h2-seq-oracle.yml

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spring:
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datasource:
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driverClassName: org.h2.Driver
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url: jdbc:h2:mem:seqdb;MODE=Oracle
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username: sa
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password:

‎persistence-modules/spring-boot-persistence-h2-2/src/test/resources/application-h2-seq.yml

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spring:
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datasource:
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driverClassName: org.h2.Driver
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url: jdbc:h2:mem:seqdb
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username: sa
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password:
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jpa:
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hibernate:
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ddl-auto: none
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show-sql: true

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