인프런 스프링 입문 09 / 스프링 JDBCTemplate

스프링 입문 - 코드로 배우는 스프링 부트, 웹 MVC, DB 접근 기술

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스프링 DB 접근 기술

스프링 JDBCTemplate

- 순수한 JDBC와 동일한 환경설정

- 스프링 JDBCTemplate과 MyBatis 같은 라이브러리는 JDBC API에서 본 반복 코드를 제거, SQL은 직접 작성

@Configuration
public class SpringConfig {
    private final DataSource dataSource;
    public SpringConfig(DataSource dataSource) {
        this.dataSource = dataSource;
    }
    @Bean
    public MemberService memberService() {
        return new MemberService(memberRepository());
    }
    @Bean
    public MemberRepository memberRepository() {
        // return new MemoryMemberRepository();
        // return new JdbcMemberRepository(dataSource);
        return new JdbcTemplateMemberRepository(dataSource);
    }
}

public class JdbcTemplateMemberRepository implements MemberRepository {

    private final JdbcTemplate jdbcTemplate;

    //생성자가 1개일 때, @Autowired 생략 가능
    //@Autowired
    public JdbcTemplateMemberRepository(DataSource dataSource) {
        jdbcTemplate = new JdbcTemplate(dataSource);
    }


    @Override
    public Member save(Member member) {

        SimpleJdbcInsert jdbcInsert = new SimpleJdbcInsert(jdbcTemplate);
        jdbcInsert.withTableName("member").usingGeneratedKeyColumns("id");

        Map<String, Object> parameters = new HashMap<>();
        parameters.put("name", member.getName());

        Number key = jdbcInsert.executeAndReturnKey(new MapSqlParameterSource(parameters));
        member.setId(key.longValue());
        return member;

    }

    @Override
    public Optional<Member> findById(Long id) {
        List<Member> result = jdbcTemplate.query("select * from member where id = ?", memberRowMapper(), id);
        return result.stream().findAny();
    }

    @Override
    public Optional<Member> findByName(String name) {
        List<Member> result = jdbcTemplate.query("select * from member where name = ?", memberRowMapper(), name);
        return result.stream().findAny();
    }

    @Override
    public List<Member> findAll() {
        return jdbcTemplate.query("select * from member", memberRowMapper());
    }

    private RowMapper<Member> memberRowMapper() {

        //return new RowMapper<Member>() {
        //    @Override
        //    public Member mapRow(ResultSet rs, int rowNum) throws SQLException {
        //        Member member = new Member();
        //        member.setId(rs.getLong("id"));
        //        member.setName(rs.getString("name"));
        //        return member;
        //    }};

        //alt + enter 로 lambda로 변형
        return (rs, rowNum) -> {
            Member member = new Member();
            member.setId(rs.getLong("id"));
            member.setName(rs.getString("name"));
            return member;
        };

    }
}

 

하지만... 테스트를 실행해보면 오류가 발생한다

어노테이션이 빠진 것 같은데...

내일 오류 해결해보자