[Java Spring Data] JapRepository

All features of CrudRepository plus:

• void flush();
• saveAndFlush()
• delteInBatch()
• delteAllInBatch()

package com.example.university.repo;

import com.example.university.domain.Department;
import org.springframework.data.jpa.repository.JpaRepository;

/**
 * DataSource Management for the Departments at the University.
 *
 * Created by maryellenbowman
 */
public interface DepartmentRepository extends JpaRepository<Department, Integer> {

}

　　

test:

package com.example.university;

import com.example.university.domain.Department;
import com.example.university.repo.DepartmentRepository;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;


/**
 * Demonstrate JPA Repository methods with DepartmentRepository
 * <p>
 * Created by maryellenbowman
 */

@RunWith(SpringRunner.class)
@SpringBootTest
public class JpaRepositoryDemo {
    @Autowired
    private DepartmentRepository departmentRepository;
    /**
     * Exercise JPA Repository methods.
     */
    @Test
    public void runJpaRepositoryMethods() {

        departmentRepository.save(new Department("Humanities"));
        departmentRepository.flush();

        departmentRepository.saveAndFlush(new Department("Fine Arts"));

        departmentRepository.save(new Department("Social Science"));

        System.out.println("
*************3 Departments*************");
        departmentRepository.findAll().forEach(System.out::println);

        departmentRepository.deleteInBatch(
                departmentRepository.findAll().subList(0,1));

        System.out.println("
*************1 Less Departments*************");
        departmentRepository.findAll().forEach(System.out::println);
        departmentRepository.deleteAllInBatch();
        System.out.println("
*************Zero Departments*************");
        departmentRepository.findAll().forEach(System.out::println);

    }
    @Before
    @After
    public void banner() {
        System.out.println("

-------------------------------------------------" +
                "-------------------------------------
");
    }
}