Fluent Mybatis实际开发中的优势对比

create table `student_score`
(
    id           bigint auto_increment comment '主键ID' primary key,
    student_id   bigint            not null comment '学号',
    gender_man   tinyint default 0 not null comment '性别, 0:女; 1:男',
    school_term  int               null comment '学期',
    subject      varchar(30)       null comment '学科',
    score        int               null comment '成绩',
    gmt_create   datetime          not null comment '记录创建时间',
    gmt_modified datetime          not null comment '记录最后修改时间',
    is_deleted   tinyint default 0 not null comment '逻辑删除标识'
) engine = InnoDB default charset=utf8;

select school_term, subject, count(score), min(score), max(score), avg(score)
from student_score
where school_term between 2000 and 2019
  and subject in ('英语', '数学', '语文')
  and is_deleted = 0
group by school_term, subject
order by school_term, subject

@Data
public class ScoreStatistics {
    private int schoolTerm;
    private String subject;
    private long count;
    private Integer minScore;
    private Integer maxScore;
    private BigDecimal avgScore;
}

public interface StudentScoreDao extends IBaseDao<StudentScoreEntity> {
    /**
     * 统计从fromYear到endYear年间学科subjects的统计数据
     *
     * @param fromYear 统计年份区间开始
     * @param endYear  统计年份区间结尾
     * @param subjects 统计的学科列表
     * @return 统计数据
     */
    List<ScoreStatistics> statistics(int fromYear, int endYear, String[] subjects);
}

@Repository
public class StudentScoreDaoImpl extends StudentScoreBaseDao implements StudentScoreDao {
    @Override
    public List<ScoreStatistics> statistics(int fromSchoolTerm, int endSchoolTerm, String[] subjects) {
        return super.listPoJos(ScoreStatistics.class, super.query()
            .select.schoolTerm().subject()
            .count("count")
            .min.score("min_score")
            .max.score("max_score")
            .avg.score("avg_score")
            .end()
            .where.isDeleted().isFalse()
            .and.schoolTerm().between(fromSchoolTerm, endSchoolTerm)
            .and.subject().in(subjects)
            .end()
            .groupBy.schoolTerm().subject().end()
            .orderBy.schoolTerm().asc().subject().asc().end()
        );
    }
}

@RunWith(SpringRunner.class)
@SpringBootTest(classes = QuickStartApplication.class)
public class StudentScoreDaoImplTest {
    @Autowired
    private StudentScoreDao dao;

    @Test
    public void statistics() {
        List<ScoreStatistics> list = dao.statistics(2000, 2019, new String[]{"语文", "数学", "英语"});
        System.out.println(list);
    }
}