The primary goal of the Spring Data project is to make it easier to build Spring-powered applications that use data access technologies. This module deals with enhanced support for Amazon DynamoDB based data access layers.
- Implementation of CRUD methods for DynamoDB Entities
- Dynamic query generation from query method names (Only a limited number of keywords and comparison operators currently supported)
- Possibility to integrate custom repository code
- Easy Spring annotation based integration
For a demo of spring-data-dynamodb, using spring-data-rest to showcase DynamoDB repositories exposed with REST, please see spring-data-dynamodb-demo
Download the jar though Maven:
<repository>
<id>opensourceagility-release</id>
<url>http://repo.opensourceagility.com/release</url
</repository><dependency>
<groupId>org.socialsignin</groupId>
<artifactId>spring-data-dynamodb</artifactId>
<version>1.0.1.RELEASE</version>
</dependency>Setup DynamoDB configuration as well as enabling Spring Data DynamoDB repository support.
@Configuration
@EnableDynamoDBRepositories(basePackages = "com.acme.repositories")
public class DynamoDBConfig {
@Value("${amazon.dynamodb.endpoint}")
private String amazonDynamoDBEndpoint;
@Value("${amazon.aws.accesskey}")
private String amazonAWSAccessKey;
@Value("${amazon.aws.secretkey}")
private String amazonAWSSecretKey;
@Bean
public AmazonDynamoDB amazonDynamoDB() {
AmazonDynamoDB amazonDynamoDB = new AmazonDynamoDBClient(
amazonAWSCredentials());
if (StringUtils.isNotEmpty(amazonDynamoDBEndpoint)) {
amazonDynamoDB.setEndpoint(amazonDynamoDBEndpoint);
}
return amazonDynamoDB;
}
@Bean
public AWSCredentials amazonAWSCredentials() {
return new BasicAWSCredentials(amazonAWSAccessKey, amazonAWSSecretKey);
}
}or in xml...
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:jdbc="http://www.springframework.org/schema/jdbc"
xmlns:jpa="http://www.springframework.org/schema/data/jpa"
xmlns:dynamodb="http://docs.socialsignin.org/schema/data/dynamodb"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://docs.socialsignin.org/schema/data/dynamodb
http://docs.socialsignin.org/schema/data/dynamodb/spring-dynamodb.xsd">
<bean id="amazonDynamoDB" class="com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient">
<constructor-arg ref="amazonAWSCredentials" />
<property name="endpoint" value="${amazon.dynamodb.endpoint}" />
</bean>
<bean id="amazonAWSCredentials" class="com.amazonaws.auth.BasicAWSCredentials">
<constructor-arg value="${amazon.aws.accesskey}" />
<constructor-arg value="${amazon.aws.secretkey}" />
</bean>
<dynamodb:repositories base-package="com.acme.repositories" amazon-dynamodb-ref="amazonDynamoDB" />
</beans>
Create a DynamoDB hash-key only table in AWS console, with table name 'User' and with hash key attribute name "id"
Create a DynamoDB entity for this table:
@DynamoDBTable(tableName = "User")
public class User {
private String id;
private String firstName;
private String lastName;
@DynamoDBHashKey
@DynamoDBAutoGeneratedKey
public String getId()
{
return id;
}
@DynamoDBAttribute
public String getFirstName()
{
return firstName;
}
@DynamoDBAttribute
public String getLastName()
{
return lastName;
}
// setters, default constructor and firstname/lastname constructor
}Create a CRUD repository interface in com.acme.repositories:
@EnableScan
public interface UserRepository extends CrudRepository<User, String> {
List<User> findByLastName(String lastName);
}or for paging and sorting...
public interface UserRepository extends PagingAndSortingRepository<User, String> {
Page<User> findByLastName(String lastName,Pageable pageable);
@EnableScan
@EnableScanCount
public Page<User> findAll(Pageable pageable);
}Write a test client
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:your-config-file.xml")
public class UserRepositoryIntegrationTest {
@Autowired UserRepository repository;
@Test
public void sampleTestCase() {
User dave = new User("Dave", "Matthews");
repository.save(user);
User carter = new User("Carter", "Beauford");
repository.save(carter);
List<User> result = repository.findByLastName("Matthews");
assertThat(result.size(), is(1));
assertThat(result, hasItem(dave));
}
}
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