Spring Data自定義Repository接口方法定義規範

概述

Repository 接口是 Spring Data 的一個核心接口，它不提供任何方法，開發者需要在自己定義的接口中聲明需要的方法 public interface Repository

@Entity
public class Employee {

    private Integer id;
    private String name;
    private Integer age;

    //省略getter/setter方法
}
Repository接口方法的具體命名.
 @RepositoryDefinition(domainClass = Employee.class, idClass = Integer.class)
public interface EmployeeRepository { //extends Repository<Employee,Integer>{

    public Employee findByName(String name);

    // where name like ?% and age <?
    public List<Employee> findByNameStartingWithAndAgeLessThan(String name, Integer age);

    // where name like %? and age <?
    public List<Employee> findByNameEndingWithAndAgeLessThan(String name, Integer age);

    // where name in (?,?....) or age <?
    public List<Employee> findByNameInOrAgeLessThan(List<String> names, Integer age);

    // where name in (?,?....) and age <?
    public List<Employee> findByNameInAndAgeLessThan(List<String> names, Integer age);

}

這裏是測試方法:

 public class EmployeeRepositoryTest {


    private ApplicationContext ctx = null;
    private EmployeeRepository employeeRepository = null;

    @Before
    public void setup() {
        ctx = new ClassPathXmlApplicationContext("beans-new.xml");
        employeeRepository = ctx.getBean(EmployeeRepository.class);
        System.out.println("setup");
    }

    @After
    public void tearDown() {
        ctx = null;
        System.out.println("tearDown");
    }

    @Test
    public void testFindByName() {
        //org.springframework.data.jpa.repository.support.SimpleJpaRepository@1a9c0566
        System.out.println(employeeRepository);
        Employee employee = employeeRepository.findByName("zhangsan");
        System.out.println("id:" + employee.getId()
                + " , name:" + employee.getName()
                + " ,age:" + employee.getAge());
    }

    @Test
    public void testFindByNameStartingWithAndAgeLessThan() {
        List<Employee> employees = employeeRepository.findByNameStartingWithAndAgeLessThan("test", 22);

        for (Employee employee : employees) {
            System.out.println("id:" + employee.getId()
                    + " , name:" + employee.getName()
                    + " ,age:" + employee.getAge());
        }
    }
}

具體規範

可以參照官網給出的命名規範.