mybatis-plus实现自定义SQL、多表查询与多表分页查询语句实例

@Repository
public interface EduTeacherMapper extends BaseMapper<EduTeacher> {
    @Select("select * from edu_teacher")
    EduTeacherMapper selectTeacherList();
}

@Service
public class EduTeacherServiceImpl extends ServiceImpl<EduTeacherMapper, EduTeacher> implements EduTeacherService {

    @Autowired
    private EduTeacherMapper teacherMapper;

    public EduTeacher selectTheacher(){
        return teacherMapper.selectTheacher();
    }
}

@Repository
public interface EduTeacherMapper extends BaseMapper<EduTeacher> {
   @Select("SELECT * FROM edu_teacher t1 INNER JOIN edu_course t2 ON t1.id = t2.teacher_id")
   EduTeacherVo selectTheacher();
}

@Configuration                  
public class MpConfig {
    
    @Bean
    public PaginationInterceptor paginationInterceptor() {
        return new PaginationInterceptor();
    }
}

public interface EduTeacherMapper extends BaseMapper<EduTeacher> {
    @Select("select * from edu_teacher")
    IPage<EduTeacher> selectTheacher(Page<EduTeacher> page);
}

@Service
public class EduTeacherServiceImpl extends ServiceImpl<EduTeacherMapper, EduTeacher> implements EduTeacherService {

    @Autowired
    private EduTeacherMapper teacherMapper;

    public void selectTheacher(){
        //1代表当前页数，10代表每页数据的数量
        Page<EduTeacher> page = new Page<>(1,10);
        IPage<EduTeacher> eduTeacherIPage = teacherMapper.selectTheacher(page);

        System.out.println(eduTeacherIPage.getCurrent());  //当前页
        System.out.println(eduTeacherIPage.getPages());    //每页数据 是一个List集合
        System.out.println(eduTeacherIPage.getSize());     //每页显示记录数
        System.out.println(eduTeacherIPage.getTotal());    //总记录数
    }
}

@Select("<script>
  SELECT t1.id,t1.qiye_id,t1.member_tag,t1.name,t1.loGo,t1.images,t1.video,t1.contacts_mobile,t1.contacts_name,t1.address,t1.sort,t1.sort,t1.click_num,t1.is_put,t1.company_type,t1.is_attestation,t1.is_recommend,t1.introduce,t1.create_time,t2.laoa_product_type_id AS productId,t3.laoa_style_id AS styleId FROM laoa_ad_loGIStics t1 LEFT JOIN laoa_product_middle t2 ON t1.qiye_id = t2.company_key LEFT JOIN laoa_style_middle t3 ON t1.qiye_id = t3.company_key
  <where>
    t1.company_type = 1
    <if test="adLogisticsVo.isOk == true">
      AND t1.is_put = 1
    </if>
    <if test="adLogisticsVo.name != null">
      AND t1.name LIKE CONCAT('%',#{adLogisticsVo.name},'%')
    </if>
    <if test="adLogisticsVo.styleId != null">
      AND t3.laoa_style_id = #{adLogisticsVo.styleId}
    </if>
    <if test="adLogisticsVo.productId != null">
      AND t2.laoa_product_type_id = #{adLogisticsVo.productId}
    </if>
  </where>
  ORDER BY t1.sort
</script>")
IPage<AdLogisticsVo> selectAdLogisticsList(@Param("page") IPage<AdLogisticsVo> page, @Param("adLogisticsVo") AdLogisticsVo adLogisticsVo);