Spring data. Familiar and consistent programming model for data access

1.

Spring data

2.

Spring data
Familiar and consistent programming model for data access.

3.

Features
- Powerful repositories.
- Dynamic query derivation from method names.
- Easy spring integration.

4.

Modules
- Spring data commons.
- Spring data jpa.
- Spring data mongodb.
- Spring data redis.
- Spring data cassandra.
- Spring data gemfire.
- Spring data rest.

5.

Dependency
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

6.

Repository interfaces
-Repository
-CrudRepository
-PagingAndSortingRepository
-JpaRepository

7.

Example
@Repository
public interface EmployeeRepository extends CrudRepository<Employee, Long> {
Employee findByFirstName(String firstName);
List<Employee> findByLastName(String lastName);
}

8.

Method naming convention
find…By, read…By, query…By, count…By, and get…By:
findDistinctPeopleByLastnameOrFirstname
findByLastnameAndFirstnameAllIgnoreCase
findByLastnameOrderByFirstnameDesc
queryFirst10ByLastname
findTop3ByLastname

9.

Async repositories
Future<User> findByUsername(String username);
CompletableFuture<User> findByUsername(String username);

10.

Auditing
@CreatedDate