Repository 代理通过两种方式得到具体的数据库操作方法：

• 直接通过方法名（方法名派生）
• 通过手动定义的查询

具体策略：

通过 @EnableJpaRepositories(queryLookupStrategy  = ?) 来指定为以下三者之一：

• CREATE
• USE_DECLARED_QUERY
• CREATE_IF_NOT_FOUND （默认）

方法名派生查询

interface PersonRepository extends Repository<Person, Long> {

  List<Person> findByEmailAddressAndLastname(EmailAddress emailAddress, String lastname);

  // Enables the distinct flag for the query
  List<Person> findDistinctPeopleByLastnameOrFirstname(String lastname, String firstname);
  List<Person> findPeopleDistinctByLastnameOrFirstname(String lastname, String firstname);

  // Enabling ignoring case for an individual property
  List<Person> findByLastnameIgnoreCase(String lastname);
  // Enabling ignoring case for all suitable properties
  List<Person> findByLastnameAndFirstnameAllIgnoreCase(String lastname, String firstname);

  // Enabling static ORDER BY for a query
  List<Person> findByLastnameOrderByFirstnameAsc(String lastname);
  List<Person> findByLastnameOrderByFirstnameDesc(String lastname);
}