Bael 5911 (#16299)

* BAEL-7490 read write file in separate thread

* Change the to try resources

* Update the code to sync with article

* get next val

* get next val

Author: wynnteo

persistence-modules/spring-data-jpa-query-4/src/main/java/com/baeldung/spring/data/jpa/getnextseq/MyEntity.java

@@ -0,0 +1,24 @@
+package com.baeldung.spring.data.jpa.getnextseq;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import javax.persistence.SequenceGenerator;
+
+@Entity
+public class MyEntity {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "mySeqGen")
+    @SequenceGenerator(name = "mySeqGen", sequenceName = "my_sequence_name", allocationSize = 1)
+    private Long id;
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+}

persistence-modules/spring-data-jpa-query-4/src/main/java/com/baeldung/spring/data/jpa/getnextseq/MyEntityApplication.java

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+package com.baeldung.spring.data.jpa.getnextseq;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class MyEntityApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(MyEntityApplication.class);
+    }
+
+}

persistence-modules/spring-data-jpa-query-4/src/main/java/com/baeldung/spring/data/jpa/getnextseq/MyEntityRepository.java

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+package com.baeldung.spring.data.jpa.getnextseq;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface MyEntityRepository extends JpaRepository<MyEntity, Long> {
+
+    @Query(value = "SELECT NEXTVAL('my_sequence_name')", nativeQuery = true)
+    Long getNextSequenceValue();
+}

persistence-modules/spring-data-jpa-query-4/src/main/java/com/baeldung/spring/data/jpa/getnextseq/MyEntityService.java

@@ -0,0 +1,22 @@
+package com.baeldung.spring.data.jpa.getnextseq;
+
+import java.math.BigInteger;
+
+import javax.persistence.EntityManager;
+import javax.persistence.PersistenceContext;
+
+import org.springframework.stereotype.Service;
+
+@Service
+public class MyEntityService {
+
+    @PersistenceContext
+    private EntityManager entityManager;
+
+    public Long getNextSequenceValue(String sequenceName) {
+        BigInteger nextValue = (BigInteger) entityManager.createNativeQuery("SELECT NEXTVAL(:sequenceName)")
+            .setParameter("sequenceName", sequenceName)
+            .getSingleResult();
+        return nextValue.longValue();
+    }
+}

persistence-modules/spring-data-jpa-query-4/src/test/java/com/baeldung/spring/data/jpa/getnextseq/MyEntityRepositoryIntegrationTest.java

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+package com.baeldung.spring.data.jpa.getnextseq;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.ActiveProfiles;
+import org.springframework.test.context.jdbc.Sql;
+
+@SpringBootTest
+@ActiveProfiles("test")
+@Sql(scripts = "/testsequence.sql", executionPhase = Sql.ExecutionPhase.BEFORE_TEST_METHOD)
+public class MyEntityRepositoryIntegrationTest {
+    @Autowired
+    private MyEntityRepository myEntityRepository;
+
+    @Autowired
+    private MyEntityService myEntityService;
+
+    @Test
+    void whenUsingSequenceGenerator_thenNextValueReturned() {
+        MyEntity entity = new MyEntity();
+        myEntityRepository.save(entity);
+
+        long generatedId = entity.getId();
+        assertNotNull(generatedId);
+        assertEquals(1L, generatedId);
+    }
+
+
+    @Test
+    void whenUsingCustomQuery_thenNextValueReturned() {
+        long generatedId = myEntityRepository.getNextSequenceValue();
+        assertNotNull(generatedId);
+        assertEquals(1L, generatedId);
+    }
+
+    @Test
+    void whenUsingEntityManager_thenNextValueReturned() {
+        long generatedId = myEntityService.getNextSequenceValue("my_sequence_name");
+        assertNotNull(generatedId);
+        assertEquals(1L, generatedId);
+    }
+
+}

persistence-modules/spring-data-jpa-query-4/src/test/resources/testsequence.sql

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+DROP SEQUENCE IF EXISTS my_sequence_name;
+
+CREATE SEQUENCE my_sequence_name START 1;