BAEL-6157 - Using records with JPA (#13626)

* BAEL-6157 - Using records with JPA

* BAEL-6157 - Changing test class name

* BAEL-6157 - Changing test class name

* BAEL-6157 - Adding start-class to module

spring-boot-modules/spring-boot-3/pom.xml

@@ -124,6 +124,8 @@
         <mapstruct.version>1.5.2.Final</mapstruct.version>
         <springdoc.version>2.0.0</springdoc.version>
         <maven-surefire-plugin.version>3.0.0-M7</maven-surefire-plugin.version>
+        <start-class>com.baeldung.sample.TodoApplication</start-class>
+
     </properties>
 
 </project>

spring-boot-modules/spring-boot-3/src/main/java/com/baeldung/recordswithjpa/QueryService.java

@@ -0,0 +1,42 @@
+package com.baeldung.recordswithjpa;
+
+import com.baeldung.recordswithjpa.entity.Book;
+import com.baeldung.recordswithjpa.records.BookRecord;
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.PersistenceContext;
+import jakarta.persistence.Query;
+import jakarta.persistence.TypedQuery;
+import jakarta.persistence.criteria.CriteriaBuilder;
+import jakarta.persistence.criteria.CriteriaQuery;
+import jakarta.persistence.criteria.Root;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+@Service
+public class QueryService {
+    @PersistenceContext
+    private EntityManager entityManager;
+
+    public List<BookRecord> findAllBooks() {
+        CriteriaBuilder cb = entityManager.getCriteriaBuilder();
+        CriteriaQuery<BookRecord> query = cb.createQuery(BookRecord.class);
+        Root<Book> root = query.from(Book.class);
+        query.select(cb
+          .construct(BookRecord.class, root.get("id"), root.get("title"), root.get("author"), root.get("isbn")));
+        return entityManager.createQuery(query).getResultList();
+    }
+
+    public BookRecord findBookById(Long id) {
+        TypedQuery<BookRecord> query = entityManager
+          .createQuery("SELECT new com.baeldung.recordswithjpa.records.BookRecord(b.id, b.title, b.author, b.isbn) " +
+                  "FROM Book b WHERE b.id = :id", BookRecord.class);
+        query.setParameter("id", id);
+        return query.getSingleResult();
+    }
+
+    public List<BookRecord> findAllBooksUsingMapping() {
+        Query query = entityManager.createNativeQuery("SELECT * FROM book", "BookRecordMapping");
+        return query.getResultList();
+    }
+}

spring-boot-modules/spring-boot-3/src/main/java/com/baeldung/recordswithjpa/RecordsAsJpaApplication.java

@@ -0,0 +1,13 @@
+package com.baeldung.recordswithjpa;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class RecordsAsJpaApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(RecordsAsJpaApplication.class, args);
+    }
+
+}

spring-boot-modules/spring-boot-3/src/main/java/com/baeldung/recordswithjpa/entity/Book.java

@@ -0,0 +1,70 @@
+package com.baeldung.recordswithjpa.entity;
+
+import com.baeldung.recordswithjpa.records.BookRecord;
+import jakarta.persistence.*;
+
+@SqlResultSetMapping(
+        name = "BookRecordMapping",
+        classes = @ConstructorResult(
+                targetClass = BookRecord.class,
+                columns = {
+                        @ColumnResult(name = "id", type = Long.class),
+                        @ColumnResult(name = "title", type = String.class),
+                        @ColumnResult(name = "author", type = String.class),
+                        @ColumnResult(name = "isbn", type = String.class)
+                }
+        )
+)
+@Entity
+@Table(name = "book")
+public class Book {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+    private String title;
+    private String author;
+    private String isbn;
+
+    public Book() {
+    }
+
+    public Book(Long id, String title, String author, String isbn) {
+        this.id = id;
+        this.title = title;
+        this.author = author;
+        this.isbn = isbn;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public String getAuthor() {
+        return author;
+    }
+
+    public void setAuthor(String author) {
+        this.author = author;
+    }
+
+    public String getIsbn() {
+        return isbn;
+    }
+
+    public void setIsbn(String isbn) {
+        this.isbn = isbn;
+    }
+
+}

spring-boot-modules/spring-boot-3/src/main/java/com/baeldung/recordswithjpa/records/BookRecord.java

@@ -0,0 +1,4 @@
+package com.baeldung.recordswithjpa.records;
+
+public record BookRecord(Long id, String title, String author, String isbn) {
+}

spring-boot-modules/spring-boot-3/src/main/java/com/baeldung/recordswithjpa/records/CustomBookRecord.java

@@ -0,0 +1,4 @@
+package com.baeldung.recordswithjpa.records;
+
+public record CustomBookRecord(Long id, String title) {
+}

spring-boot-modules/spring-boot-3/src/main/java/com/baeldung/recordswithjpa/repository/BookRepository.java

@@ -0,0 +1,17 @@
+package com.baeldung.recordswithjpa.repository;
+
+import com.baeldung.recordswithjpa.entity.Book;
+import com.baeldung.recordswithjpa.records.BookRecord;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.CrudRepository;
+import org.springframework.data.repository.query.Param;
+
+import java.util.List;
+
+public interface BookRepository extends CrudRepository<Book, Long> {
+    List<BookRecord> findBookByAuthor(String author);
+
+    @Query("SELECT new com.baeldung.recordswithjpa.records.BookRecord(b.id, b.title, b.author, b.isbn) " +
+            "FROM Book b WHERE b.id = :id")
+    BookRecord findBookById(@Param("id") Long id);
+}

spring-boot-modules/spring-boot-3/src/main/java/com/baeldung/recordswithjpa/repository/CustomBookRepository.java

@@ -0,0 +1,9 @@
+package com.baeldung.recordswithjpa.repository;
+
+import com.baeldung.recordswithjpa.records.CustomBookRecord;
+
+import java.util.List;
+
+public interface CustomBookRepository {
+    List<CustomBookRecord> findAllBooks();
+}

spring-boot-modules/spring-boot-3/src/main/java/com/baeldung/recordswithjpa/repository/CustomBookRepositoryImpl.java

@@ -0,0 +1,20 @@
+package com.baeldung.recordswithjpa.repository;
+
+import com.baeldung.recordswithjpa.records.CustomBookRecord;
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+
+@Repository
+public class CustomBookRepositoryImpl implements CustomBookRepository {
+    private final JdbcTemplate jdbcTemplate;
+
+    public CustomBookRepositoryImpl(JdbcTemplate jdbcTemplate) {
+        this.jdbcTemplate = jdbcTemplate;
+    }
+
+    public List<CustomBookRecord> findAllBooks() {
+        return jdbcTemplate.query("SELECT id, title FROM book", (rs, rowNum) -> new CustomBookRecord(rs.getLong("id"), rs.getString("title")));
+    }
+}

spring-boot-modules/spring-boot-3/src/test/java/com/baeldung/recordswithjpa/QueryServiceIntegrationTest.java

@@ -0,0 +1,39 @@
+package com.baeldung.recordswithjpa;
+
+import com.baeldung.recordswithjpa.entity.Book;
+import com.baeldung.recordswithjpa.records.BookRecord;
+import com.baeldung.recordswithjpa.repository.BookRepository;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class QueryServiceIntegrationTest extends RecordsAsJpaIntegrationTest {
+
+    @Autowired
+    private QueryService queryService;
+
+
+    @Test
+    void findAllBooks() {
+        List<BookRecord> allBooks = queryService.findAllBooks();
+        assertEquals(3, allBooks.size());
+    }
+
+    @Test
+    void findBookById() {
+        BookRecord bookById = queryService.findBookById(1L);
+        assertEquals("The Lord of the Rings", bookById.title());
+    }
+
+    @Test
+    void findAllBooksUsingMapping() {
+        List<BookRecord> allBooksUsingMapping = queryService.findAllBooksUsingMapping();
+        assertEquals(3, allBooksUsingMapping.size());
+    }
+}

spring-boot-modules/spring-boot-3/src/test/java/com/baeldung/recordswithjpa/RecordsAsJpaIntegrationTest.java

@@ -0,0 +1,30 @@
+package com.baeldung.recordswithjpa;
+
+import com.baeldung.recordswithjpa.entity.Book;
+import com.baeldung.recordswithjpa.repository.BookRepository;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+public class RecordsAsJpaIntegrationTest {
+    @Autowired
+    protected BookRepository bookRepository;
+
+    @BeforeEach
+    void setUp() {
+        Book book = new Book(1L,"The Lord of the Rings", "J.R.R. Tolkien", "978-0544003415");
+        Book book2 = new Book(2L,"The Hobbit", "J.R.R. Tolkien", "978-0547928227");
+        Book book3 = new Book(3L,"Harry Potter and the Philosopher's Stone", "J.K. Rowling", "978-0747532699");
+
+        bookRepository.save(book);
+        bookRepository.save(book2);
+        bookRepository.save(book3);
+    }
+
+    @AfterEach
+    void tearDown() {
+        bookRepository.deleteAll();
+    }
+}

spring-boot-modules/spring-boot-3/src/test/java/com/baeldung/recordswithjpa/repository/BookRepositoryIntegrationTest.java

@@ -0,0 +1,19 @@
+package com.baeldung.recordswithjpa.repository;
+
+import com.baeldung.recordswithjpa.RecordsAsJpaIntegrationTest;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class BookRepositoryIntegrationTest extends RecordsAsJpaIntegrationTest {
+
+    @Test
+    void findBookByAuthor() {
+       assertEquals(2, bookRepository.findBookByAuthor("J.R.R. Tolkien").size());
+    }
+
+    @Test
+    void findBookById() {
+        assertEquals("The Lord of the Rings", bookRepository.findBookById(1L).title());
+    }
+}

spring-boot-modules/spring-boot-3/src/test/java/com/baeldung/recordswithjpa/repository/CustomBookRepositoryIntegrationTest.java

@@ -0,0 +1,23 @@
+package com.baeldung.recordswithjpa.repository;
+
+import com.baeldung.recordswithjpa.RecordsAsJpaIntegrationTest;
+import com.baeldung.recordswithjpa.records.CustomBookRecord;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class CustomBookRepositoryIntegrationTest extends RecordsAsJpaIntegrationTest {
+
+    @Autowired
+    private CustomBookRepository customBookRepository;
+
+    @Test
+    void findAllBooks() {
+        List<CustomBookRecord> allBooks = customBookRepository.findAllBooks();
+        assertEquals(3, allBooks.size());
+    }
+}