/ Java Zone
Over a million developers have joined DZone.
{{announcement.body}}
{{announcement.title}}

Simpler JPA with Spring Data-JPA

DZone 's Guide to

Simpler JPA with Spring Data-JPA

by
·
Aug. 08, 11 · Java Zone ·
Free Resource

Comment (0)

Save
Tweet
{{ articles[0].views | formatCount}} Views

How to configure your Spring application with Simple CRUD configuration with Spring Data-JPA.

1. Add Spring Data-JPA to project configuration. In your Maven pom.xml file

<dependency>
   <groupId>org.springframework.data</groupId>
   <artifactId>spring-data-jpa</artifactId>
   <version>1.0.0.RELEASE</version>
</dependency>

2. Configure JPA Entity

...
 
@Entity
public class Product {
 
  @Id
  @GeneratedValue(strategy = GenerationType.AUTO)
  @Column(name = "id")
  private Long id;
 
  @NotNull
  @Column(unique = true)
  private String productId;
 
  @NotNull
  private Integer quantity;
 
  ...
}

3. Configure Typed Repository Interface

Spring Data JPA will create the beans for us.

package com.gordondickens.myapp.repository;
 
import org.springframework.data.repository.CrudRepository;
import com.gordondickens.myapp.entity.Product;
 
public interface ProductRepository
   extends CrudRepository<Product, Long> {}

4. Configure the application context

Note: this example uses Hibernate and HSQL

<!-- Directory to scan for repository classes -->
<jpa:repositories
   base-package="com.gordondickens.myapp.repository" />
 
<bean class="org.springframework.orm.jpa.JpaTransactionManager"
  id="transactionManager">
  <property name="entityManagerFactory"
      ref="entityManagerFactory" />
  <property name="jpaDialect">
    <bean class="org.springframework.orm.jpa.vendor.HibernateJpaDialect" />
  </property>
</bean>
 
<bean id="entityManagerFactory"
  class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
  <property name="dataSource" ref="dataSource" />
  <property name="jpaVendorAdapter">
    <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
      <property name="generateDdl" value="true" />
      <property name="database" value="HSQL" />
    </bean>
  </property>
</bean>

5. Inject the Repository

In our service class & tests we use the repository to execute our crud methods. Repository Methods: count(), exists(), delete(), deleteAll(), findOne(), findAll(), save().

public class ProductServiceImpl extends ProductService {
 
   @Autowired
   ProductRepository productRepository;
 
  ...
}

Summary

The Spring Data project abstracts away basic data management concepts. In addition to support for traditional relational methodologies, Spring Data provides support for NoSQL Graph, Key-Value and Map-Reduce types. As we saw in the above example configuring CRUD style applications is fairly trivial and Spring provides a convenient configuration for the typical cookie cutter code.

Click here to see my other blog which lists the annotations in “Spring Data-Commons” and “Spring Data-JPA”.

 

From http://gordondickens.com/wordpress/2011/08/01/simpler-jpa-with-spring-data-jpa/

Like This Article? Read More From DZone

Using Query Tags With Entity Framework Core 2.2
Local Type Inference Cheat Sheet for Java 10 and Beyond
Agile Milestone Criteria for Projects and Programs

Free DZone Refcard

Java Containerization
DOWNLOAD
Topics:

Comment (0)

Save
Tweet
{{ articles[0].views | formatCount}} Views

Opinions expressed by DZone contributors are their own.

Java Partner Resources

{{ parent.title || parent.header.title}}

{{ parent.tldr }}

{{ parent.linkDescription }}

{{ parent.urlSource.name }}
by {{ parent.authors[0].realName || parent.author}}
· {{ parent.articleDate | date:'MMM. dd, yyyy' }} {{ parent.linkDate | date:'MMM. dd, yyyy' }}
· {{ parent.portal.name }} Zone