SqlResultSetMapping Via EntityManager

Author: AnghelLeonard

HibernateSpringBootDtoViaSqlResultSetMappingEm/src/main/java/com/bookstore/MainApplication.java

@@ -25,7 +25,7 @@ public static void main(String[] args) {
     public ApplicationRunner init() {
         return args -> {
 
-            List<AuthorDto> authors = bookstoreService.fetchNameAndAge();
+            List<AuthorDto> authors = bookstoreService.fetchAuthorsNamesAndAges();
 
             System.out.println("Number of authors:" + authors.size());
 

HibernateSpringBootDtoViaSqlResultSetMappingEm/src/main/java/com/bookstore/dao/AuthorDao.java

@@ -0,0 +1,9 @@
+package com.bookstore.dao;
+
+import com.bookstore.dto.AuthorDto;
+import java.util.List;
+
+public interface AuthorDao {
+    
+    public List<AuthorDto> fetchNameAndAge();
+}

…src/main/java/com/bookstore/dao/Dao.java …ava/com/bookstore/dao/AuthorDaoImpl.javaHibernateSpringBootDtoViaSqlResultSetMappingEm/src/main/java/com/bookstore/dao/Dao.java renamed to HibernateSpringBootDtoViaSqlResultSetMappingEm/src/main/java/com/bookstore/dao/AuthorDaoImpl.java HibernateSpringBootDtoViaSqlResultSetMappingEm/src/main/java/com/bookstore/dao/Dao.java renamed to HibernateSpringBootDtoViaSqlResultSetMappingEm/src/main/java/com/bookstore/dao/AuthorDaoImpl.java

@@ -6,23 +6,22 @@
 import javax.persistence.PersistenceContext;
 import javax.persistence.Query;
 import org.springframework.stereotype.Repository;
+import org.springframework.transaction.annotation.Transactional;
 
 @Repository
-public class Dao {
+@Transactional(readOnly=true)
+public class AuthorDaoImpl implements AuthorDao {
 
     @PersistenceContext
     private EntityManager entityManager;
 
+    @Override
     public List<AuthorDto> fetchNameAndAge() {
 
         Query query = entityManager.createNativeQuery(
                 "SELECT name, age FROM author", "AuthorDtoMapping");
         List<AuthorDto> authors = query.getResultList();
 
         return authors;
-    }
-
-    protected EntityManager getEntityManager() {
-        return entityManager;
-    }
+    }    
 }

HibernateSpringBootDtoViaSqlResultSetMappingEm/src/main/java/com/bookstore/service/BookstoreService.java

@@ -1,20 +1,20 @@
 package com.bookstore.service;
 
-import com.bookstore.dao.Dao;
+import com.bookstore.dao.AuthorDaoImpl;
 import java.util.List;
 import org.springframework.stereotype.Service;
 import com.bookstore.dto.AuthorDto;
 
 @Service
 public class BookstoreService {
 
-    private final Dao dao;
+    private final AuthorDaoImpl dao;
 
-    public BookstoreService(Dao dao) {
+    public BookstoreService(AuthorDaoImpl dao) {
         this.dao = dao;
     }
 
-    public List<AuthorDto> fetchNameAndAge() {
+    public List<AuthorDto> fetchAuthorsNamesAndAges() {
 
         return dao.fetchNameAndAge();
     }

HibernateSpringBootDtoViaSqlResultSetMappingEm/src/main/resources/application.properties

@@ -5,7 +5,7 @@ spring.datasource.password=root
 spring.jpa.hibernate.ddl-auto=create
 spring.jpa.show-sql=true
 
-spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5Dialect
+spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL8Dialect
 
 spring.datasource.initialization-mode=always
 spring.datasource.platform=mysql