SSM Integration Case Based on SpringBoot--SpringBoot Quick Start Nanny-Level Tutorial (4)

---

foreword

In order to consolidate the knowledge learned, the author tried to start publishing some blogs of learning notes for future review. Of course, it would be great if it could help some newcomers learn new technologies. The author is a piece of food. If there are any mistakes in the records in the article, readers and friends are welcome to criticize and correct.
(The reference source code of the blog can be found in the resources on my homepage. If you have any questions during the learning process, please feel free to ask me in the comment area)

建议先去浏览本人ssm专栏发布的ssm快速入门案例（一）（二）后再阅读本文章

4. SSM integration case based on SpringBoot

1. Design and create database table tbl_book

-- ----------------------------
-- Table structure for tbl_book
-- ----------------------------
DROP TABLE IF EXISTS `tbl_book`;
CREATE TABLE `tbl_book`  (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `type` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `name` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `description` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 13 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of tbl_book
-- ----------------------------
INSERT INTO `tbl_book` VALUES (1, '计算机理论', 'Spring实战 第5版', 'Spring入门经典教程，深入理解Spring原理技术内幕');
INSERT INTO `tbl_book` VALUES (2, '计算机理论', 'Spring 5核心原理与30个类手写实战', '十年沉淀之作，手写Spring精华思想');
INSERT INTO `tbl_book` VALUES (3, '计算机理论', 'Spring 5 设计模式', '深入Spring源码剖析Spring源码中蕴含的10大设计模式');
INSERT INTO `tbl_book` VALUES (4, '计算机理论', 'Spring MVC+MyBatis开发从入门到项目实战', '全方位解析面向Web应用的轻量级框架，带你成为Spring MVC开发高手');
INSERT INTO `tbl_book` VALUES (5, '计算机理论', '轻量级Java Web企业应用实战', '源码级剖析Spring框架，适合已掌握Java基础的读者');
INSERT INTO `tbl_book` VALUES (6, '计算机理论', 'Java核心技术 卷I 基础知识（原书第11版）', 'Core Java 第11版，Jolt大奖获奖作品，针对Java SE9、10、11全面更新');
INSERT INTO `tbl_book` VALUES (7, '计算机理论', '深入理解Java虚拟机', '5个维度全面剖析JVM，大厂面试知识点全覆盖');
INSERT INTO `tbl_book` VALUES (8, '计算机理论', 'Java编程思想（第4版）', 'Java学习必读经典,殿堂级著作！赢得了全球程序员的广泛赞誉');
INSERT INTO `tbl_book` VALUES (9, '计算机理论', '零基础学Java（全彩版）', '零基础自学编程的入门图书，由浅入深，详解Java语言的编程思想和核心技术');
INSERT INTO `tbl_book` VALUES (10, '市场营销', '直播就该这么做：主播高效沟通实战指南', '李子柒、李佳琦、薇娅成长为网红的秘密都在书中');
INSERT INTO `tbl_book` VALUES (11, '市场营销', '直播销讲实战一本通', '和秋叶一起学系列网络营销书籍');
INSERT INTO `tbl_book` VALUES (12, '市场营销', '直播带货：淘宝、天猫直播从新手到高手', '一本教你如何玩转直播的书，10堂课轻松实现带货月入3W+');

2. Create a new SpringBoot module and check the relevant dependencies

3. Add relevant coordinates that were not provided when SpringBoot created the project

<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>druid</artifactId>
			<version>1.1.16</version>
		</dependency>

4. Create an entity class Book based on the database table

public class Book {
    
    
    //此处省略gettr、setter和toString方法
    private Integer id;
    private String type;
    private String name;
    private String description;

5. Write dao layer to operate BookDao

@Mapper
public interface BookDao {
    
    

    @Insert("insert into tbl_book (type,name,description) values(#{type},#{name},#{description})")
    public int save(Book book);

    @Update("update tbl_book set type = #{type}, name = #{name}, description = #{description} where id = #{id}")
    public int update(Book book);

    @Delete("delete from tbl_book where id = #{id}")
    public int delete(Integer id);

    @Select("select * from tbl_book where id = #{id}")
    public Book getById(Integer id);

    @Select("select * from tbl_book")
    public List<Book> getAll();
}

6. Write the Service service layer interface BookService

@Transactional
public interface BookService {
    
    

    /**
     * 保存
     * @param book
     * @return
     */
    public boolean save(Book book);

    /**
     * 修改
     * @param book
     * @return
     */
    public boolean update(Book book);

    /**
     * 按id删除
     * @param id
     * @return
     */
    public boolean delete(Integer id);

    /**
     * 按id查询
     * @param id
     * @return
     */
    public Book getById(Integer id);

    /**
     * 查询全部
     * @return
     */
    public List<Book> getAll();
}

7. Write the service layer implementation class BookServiceImpl

@Service
public class BookServiceImpl implements BookService {
    
    
    @Autowired
    private BookDao bookDao;

    public boolean save(Book book) {
    
    
        return bookDao.save(book) > 0;
    }

    public boolean update(Book book) {
    
    
        return bookDao.update(book) > 0;
    }

    public boolean delete(Integer id) {
    
    
        return bookDao.delete(id) > 0;
    }

    public Book getById(Integer id) {
    
    
        if(id == 1){
    
    
            throw new BusinessException(Code.BUSINESS_ERR,"请不要使用你的技术挑战我的耐性!");
        }
//        //将可能出现的异常进行包装，转换成自定义异常
//        try{
    
    
//            int i = 1/0;
//        }catch (Exception e){
    
    
//            throw new SystemException(Code.SYSTEM_TIMEOUT_ERR,"服务器访问超时，请重试!",e);
//        }
        return bookDao.getById(id);
    }

    public List<Book> getAll() {
    
    
        return bookDao.getAll();
    }
}

8. Write the Book Module Controller layer BookController

@RestController
@RequestMapping("/books")
public class BookController {
    
    

    @Autowired
    private BookService bookService;

    @PostMapping
    public Result save(@RequestBody Book book) {
    
    
        boolean flag = bookService.save(book);
        return new Result(flag ? Code.SAVE_OK:Code.SAVE_ERR,flag);
    }

    @PutMapping
    public Result update(@RequestBody Book book) {
    
    
        boolean flag = bookService.update(book);
        return new Result(flag ? Code.UPDATE_OK:Code.UPDATE_ERR,flag);
    }

    @DeleteMapping("/{id}")
    public Result delete(@PathVariable Integer id) {
    
    
        boolean flag = bookService.delete(id);
        return new Result(flag ? Code.DELETE_OK:Code.DELETE_ERR,flag);
    }

    @GetMapping("/{id}")
    public Result getById(@PathVariable Integer id) {
    
    
        Book book = bookService.getById(id);
        Integer code = book != null ? Code.GET_OK : Code.GET_ERR;
        String msg = book != null ? "" : "数据查询失败，请重试！";
        return new Result(code,book,msg);
    }

    @GetMapping
    public Result getAll() {
    
    
        List<Book> bookList = bookService.getAll();
        Integer code = bookList != null ? Code.GET_OK : Code.GET_ERR;
        String msg = bookList != null ? "" : "数据查询失败，请重试！";
        return new Result(code,bookList,msg);
    }
}

9. Status code related design

• Code class

package org.example.controller;

public class Code {
    
    
    public static final Integer SAVE_OK = 20011;
    public static final Integer DELETE_OK = 20021;
    public static final Integer UPDATE_OK = 20031;
    public static final Integer GET_OK = 20041;

    public static final Integer SAVE_ERR = 20010;
    public static final Integer DELETE_ERR = 20020;
    public static final Integer UPDATE_ERR = 20030;
    public static final Integer GET_ERR = 20040;

    public static final Integer SYSTEM_ERR = 50001;
    public static final Integer SYSTEM_TIMEOUT_ERR = 50002;
    public static final Integer SYSTEM_UNKNOW_ERR = 59999;

    public static final Integer BUSINESS_ERR = 60002;



}

• ProjectExceptionAdvice类

@RestControllerAdvice
public class ProjectExceptionAdvice {
    
    
    @ExceptionHandler(SystemException.class)
    public Result doSystemException(SystemException ex){
    
    
        //记录日志
        //发送消息给运维
        //发送邮件给开发人员,ex对象发送给开发人员
        return new Result(ex.getCode(),null,ex.getMessage());
    }

    @ExceptionHandler(BusinessException.class)
    public Result doBusinessException(BusinessException ex){
    
    
        return new Result(ex.getCode(),null,ex.getMessage());
    }

    @ExceptionHandler(Exception.class)
    public Result doOtherException(Exception ex){
    
    
        //记录日志
        //发送消息给运维
        //发送邮件给开发人员,ex对象发送给开发人员
        return new Result(Code.SYSTEM_UNKNOW_ERR,null,"系统繁忙，请稍后再试！");
    }
}

• Result class

public class Result {
    
    
    //此处省略getter、setter方法
    private Object data;
    private Integer code;
    private String msg;

    public Result() {
    
    
    }

    public Result(Integer code,Object data) {
    
    
        this.data = data;
        this.code = code;
    }

    public Result(Integer code, Object data, String msg) {
    
    
        this.data = data;
        this.code = code;
        this.msg = msg;
    }

    public Object getData() {
    
    
        return data;
    }
}

• BusinessException class

public class BusinessException extends RuntimeException{
    
    
    private Integer code;

    public Integer getCode() {
    
    
        return code;
    }

    public void setCode(Integer code) {
    
    
        this.code = code;
    }

    public BusinessException(Integer code, String message) {
    
    
        super(message);
        this.code = code;
    }

    public BusinessException(Integer code, String message, Throwable cause) {
    
    
        super(message, cause);
        this.code = code;
    }

}

• SystemException class

public class SystemException extends RuntimeException{
    
    
    private Integer code;

    public Integer getCode() {
    
    
        return code;
    }

    public void setCode(Integer code) {
    
    
        this.code = code;
    }

    public SystemException(Integer code, String message) {
    
    
        super(message);
        this.code = code;
    }

    public SystemException(Integer code, String message, Throwable cause) {
    
    
        super(message, cause);
        this.code = code;
    }

}

10. Compare Spring-based ssm integration cases

(For details, please follow the author's ssm column)

Summarize

Everyone is welcome to leave a message for exchange and criticism. If the article is helpful to you or you think the author's writing is not bad, you can click to follow, like, and bookmark to support.
(The reference source code of the blog can be found in the resources on my homepage. If you have any questions during the learning process, please feel free to ask me in the comment area)