Spring Data JPA框架的核心概念与Repository接口详解

public interface MemberMapper extends CustomRepository<Member, Long> {
    /** 派生方法按照用户名统计人数 */
    Long countByMemberName(String username);
    /** 派生方法按照用户部门号统计人数 */
    Long countByDeptId(Integer deptId);
}

interface MemberRepository extends Repository<Member, Long> { … }

interface MemberRepository extends Repository<Member, Long> {
  List<Member> findByMembername(String username);
}

import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
@EnableJpaRepositories
public class MyConfig {
 }

<?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:jpa="http://www.springframework.org/schema/data/jpa"
   xsi:schemaLocation="http://www.springframework.org/schema/beans
     https://www.springframework.org/schema/beans/spring-beans.xsd
     http://www.springframework.org/schema/data/jpa
     https://www.springframework.org/schema/data/jpa/spring-jpa.xsd">
   <jpa:repositories base-package="com.kkarma.repository"/>
</beans>

@Configuration
@EnableMongoRepositories(*arrayOf("com.kkarma.repository", "com.???.???"))
class PersistenceConfig : AbstractMongoConfiguration() {
}

@EnableJpaRepositories("com.spr.repository")

@EnableJpaRepositories({"com.cshtong.sample.repository", "com.cshtong.tower.repository"})

@Service
public class MemberServiceImpl implements MemberService {
    private final MemberMapper memberMapper;
    public MemberServiceImpl(MemberMapper memberMapper) {
        this.memberMapper = memberMapper;
    }
    @Override
    public ApiResponse insertMember(Member member) {
        Member user = memberMapper.save(member);
        return ApiResponse.success("新增成功", user);
    }
}