Springboot整合通用mapper进阶1

1.自定义sql方法的使用,mapper的依赖配置文件就不一一赘述了,详情: https://blog.csdn.net/brantykl/article/details/129360320?spm=1001.2014.3001.5502

2.实体类映射

@Repository
@Data
@Table(name = "t_company")
public class Company implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id")
    private Integer id;

    @Column(name = "shortName")
    private String shortName;

    @Column(name = "fullName")
    private String fullName;

    @Column(name = "isFamous")
    private Integer isFamous;

    @Column(name = "state")
    private Integer state;

    @Column(name = "remark")
    private String remark;

    @Column(name = "createDate")
    private Date createDate;

    @Column(name = "cityId")
    private Integer cityId;

    @Column(name = "userId")
    private Integer userId;

    @Column(name = "orderNo")
    private Integer orderNo;
}

3.生成表和数据

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for t_company
-- ----------------------------
DROP TABLE IF EXISTS `t_company`;
CREATE TABLE `t_company`  (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `shortName` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '公司名称',
  `fullName` varchar(50) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '公司全称',
  `isFamous` int(11) NULL DEFAULT NULL COMMENT '是否名企：\r\n            0.不是  \r\n            1.是',
  `state` int(11) NULL DEFAULT NULL COMMENT '状态：\r\n            0.启用\r\n            1.禁用',
  `remark` varchar(100) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
  `createDate` datetime NULL DEFAULT NULL,
  `cityId` int(11) NULL DEFAULT NULL,
  `userId` int(11) NULL DEFAULT NULL,
  `orderNo` int(11) NULL DEFAULT NULL COMMENT '排序编号',
  PRIMARY KEY (`id`) USING BTREE,
  INDEX `fk_compone_user`(`userId`) USING BTREE,
  INDEX `FK_fk_dict_company`(`cityId`) USING BTREE,
  CONSTRAINT `fk_compone_user` FOREIGN KEY (`userId`) REFERENCES `t_user` (`id`) ON DELETE RESTRICT ON UPDATE RESTRICT,
  CONSTRAINT `FK_fk_dict_company` FOREIGN KEY (`cityId`) REFERENCES `t_dict` (`id`) ON DELETE RESTRICT ON UPDATE RESTRICT
) ENGINE = InnoDB AUTO_INCREMENT = 36 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci COMMENT = '公司表' ROW_FORMAT = Compact;

-- ----------------------------
-- Records of t_company
-- ----------------------------
INSERT INTO `t_company` VALUES (1, '北京淘宝网', NULL, 1, 0, NULL, '2019-08-08 00:00:00', 9, 1, 1);
INSERT INTO `t_company` VALUES (2, '北京支付宝', NULL, 1, 0, NULL, '2019-08-08 00:00:00', 10, 1, 1);
INSERT INTO `t_company` VALUES (3, '北京蚂蚁金服', NULL, 1, 0, NULL, '2019-08-08 00:00:00', 10, 1, 1);
INSERT INTO `t_company` VALUES (4, '七牛云服务', NULL, 1, 0, NULL, '2019-08-08 00:00:00', 10, 1, 1);
INSERT INTO `t_company` VALUES (5, '拼多多', NULL, 1, 0, NULL, '2019-08-08 00:00:00', 10, 1, 1);
INSERT INTO `t_company` VALUES (6, '唯品会', NULL, 1, 0, NULL, '2019-08-08 00:00:00', 10, 1, 1);
INSERT INTO `t_company` VALUES (7, '唯品会', NULL, 1, 0, NULL, '2019-08-08 00:00:00', 12, 1, 1);
INSERT INTO `t_company` VALUES (8, '腾讯公司', NULL, 1, 0, NULL, '2019-08-08 00:00:00', 13, 1, 1);
INSERT INTO `t_company` VALUES (9, '杭州淘宝网', NULL, 1, 0, NULL, '2019-08-08 00:00:00', 13, 1, 1);
INSERT INTO `t_company` VALUES (10, '浪潮软件', NULL, 1, 0, NULL, '2019-08-08 00:00:00', 14, 1, 1);
INSERT INTO `t_company` VALUES (12, '简途旅行', NULL, 1, 0, NULL, '2019-08-08 00:00:00', 15, 1, 1);
INSERT INTO `t_company` VALUES (13, '绿盟科技', NULL, 1, 0, NULL, '2019-08-08 00:00:00', 16, 1, 1);
INSERT INTO `t_company` VALUES (14, '金信石', NULL, 0, 0, NULL, '2019-08-08 00:00:00', 9, 1, 1);
INSERT INTO `t_company` VALUES (15, '贵鑫堂', NULL, 0, 0, NULL, '2019-08-08 00:00:00', 3, 1, 1);
INSERT INTO `t_company` VALUES (16, '掌众金服', NULL, 0, 0, NULL, '2019-08-08 00:00:00', 9, 1, 1);
INSERT INTO `t_company` VALUES (17, '晨创科技', NULL, 0, 0, NULL, '2019-08-08 00:00:00', 9, 1, 1);
INSERT INTO `t_company` VALUES (18, '中软国际', NULL, 1, 0, NULL, '2019-08-08 00:00:00', 9, 1, 1);
INSERT INTO `t_company` VALUES (19, '全景网', NULL, 0, 0, NULL, '2019-08-08 00:00:00', 9, 1, 1);
INSERT INTO `t_company` VALUES (20, '翼龙贷', NULL, 0, 0, NULL, '2019-08-08 00:00:00', 9, 1, 1);
INSERT INTO `t_company` VALUES (21, '中烟新商盟', NULL, 0, 0, NULL, '2019-08-08 00:00:00', 9, 1, 1);
INSERT INTO `t_company` VALUES (22, '西安泰晟', NULL, 0, 0, NULL, '2019-08-08 00:00:00', 9, 1, 1);
INSERT INTO `t_company` VALUES (23, '联创佳讯', NULL, 0, 0, NULL, '2019-08-08 00:00:00', 9, 1, 1);
INSERT INTO `t_company` VALUES (24, '神航星云', NULL, 0, 0, NULL, '2019-08-08 00:00:00', 9, 1, 1);
INSERT INTO `t_company` VALUES (25, '软通动力', NULL, 1, 0, NULL, '2019-08-08 00:00:00', 9, 1, 1);
INSERT INTO `t_company` VALUES (26, '网众传媒', NULL, 1, 0, NULL, '2019-08-08 00:00:00', 9, 1, 1);
INSERT INTO `t_company` VALUES (27, '软通动力', NULL, 1, 0, NULL, '2019-08-08 00:00:00', 9, 1, 1);
INSERT INTO `t_company` VALUES (28, '文思海辉', NULL, 1, 0, NULL, '2019-08-08 00:00:00', 9, 1, 1);
INSERT INTO `t_company` VALUES (29, '赞同科技', NULL, 0, 0, NULL, '2019-08-08 00:00:00', 9, 1, 1);
INSERT INTO `t_company` VALUES (30, '北正云鼎', NULL, 0, 0, NULL, '2019-08-08 00:00:00', 9, 1, 1);
INSERT INTO `t_company` VALUES (31, '信雅达', NULL, 0, 0, NULL, '2019-08-08 00:00:00', 9, 1, 1);
INSERT INTO `t_company` VALUES (32, '东方微银', NULL, 0, 0, NULL, '2019-08-08 00:00:00', 9, 1, 1);
INSERT INTO `t_company` VALUES (33, '易宝软件', NULL, 0, 0, NULL, '2019-08-08 00:00:00', 9, 1, 1);
INSERT INTO `t_company` VALUES (34, '智乾区块链', NULL, 0, 0, NULL, '2019-08-08 00:00:00', 9, 1, 1);
INSERT INTO `t_company` VALUES (35, '中科金财', NULL, 0, 0, NULL, '2019-08-08 00:00:00', 9, 1, 1);

SET FOREIGN_KEY_CHECKS = 1;

4.编写xml文件

DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.brant.dao.ICompanyDao">

    
    <select id="findAll" resultType="com.brant.entity.Company">
        SELECT * FROM t_company
    select>

    
    <select id="findById" parameterType="int" resultType="com.brant.entity.Company">
        SELECT * FROM t_company WHERE id=#{id}
    select>

    
    <update id="update" parameterType="com.brant.entity.Company">
        UPDATE t_company SET shortName=#{shortName},fullName=#{fullName},isFamous=#{isFamous},
                             state=#{state},remark=#{remark},createDate=#{createDate},cityId=#{cityId},userId=#{userId},orderNo=#{orderNo}
        WHERE id=#{id}
    update>

    
    <delete id="deleteById" parameterType="int">
        DELETE FROM t_company WHERE id=#{id}
    delete>

mapper>

5.目录结构,这里需要注意xml文件名称需要与ICompanyDao一致.在配置文件配置也要是这样mapper-locations: classpath:com.brant.dao/*Mapper.xml,否则就不可以找到xml文件(这里的*是任意)

6.编写一个简单demo,依次在controller,service,dao编写deleteById

@RequestMapping("/company")
@Controller
public class CompanyController {

    @Autowired
    private ICompanyService companyService;

    @RequestMapping(method = RequestMethod.GET,path = "/deleteCompanyById/{id}")
    @ResponseBody
    public String deleteCompanyById( @PathVariable Integer id){

        if(StringUtils.isEmpty(companyService.findCompanyById(id))){
            return "公司不存在";
        }else {
            companyService.deleteById(id);
            return "删除成功";
        }

    }

}

public interface ICompanyService {
    void deleteById(Integer id);
}

@Service
public class CompanyServiceImpl implements ICompanyService {

    @Autowired
    private ICompanyDao companyDao;

    @Override
    public void deleteById(Integer id) {
        companyDao.deleteById(id);
    }

}

@Component
public interface ICompanyDao extends IBaseDao<Company>{
    /**
     * description: 根据id删除公司
     *
     * @params No such property: code for class: Script1
     * @return
     */
    Boolean delete(Integer id);
}

6.总结
．1)在使用自定义的数据操作时,要注意方法不要与mapper里封装好的方法重复,否则编译会报错
　2)在写xml文件时,一定要注意文件名和命名空间(namespace)不要写错了,后面spring找不到
　3)在resources建立目录需要使用com/brant/dao的形式,当然也可以直接和dao.下的xxx.java文件写在一起,只要定义好mapper-locations就可以了
　4)除了使用xml也可以使用注解@Delete来实现数据操作

    /**
     * description: 根据id删除公司
     *
     * @params No such property: code for class: Script1
     * @return
     */
    @Delete("DELETE FROM t_company WHERE id=#{id}")
    void deleteById(int id);

7.之前有拿到一个ChatGPT的账号,于是就是用了.发现ChatGPT体验非常好,之前碰到的好多问题,都需要我们去百度搜索.可是,百度出来的垃圾数据有许多,而且还有一些不成功的案例.有一些常识性的东西忘记了,百度却要花费十几分钟的时间.因此ChatGPT确实可以提高解决问题的速度.下面贴一些使用ChatGPT的一些问答,当然,对于我来说,ChatGPT下一位老师,简称（柴师傅),后面会借助它在java以及一些其它领域升级打怪.目前在工作没有用到,不过学习上确实受益匪浅,码代码的速度也快多了.后面会更注重一些设计模式底层的东西了.

．a)问题1:

．b)问题2：