springBoot+mybaties后端多层架构的实现示例

目录

• 前期准备
• 配置mybais-config.xml
• 数据库建表案例
• Paramr案例

前期准备

1.建立一个springBoot项目

2.导入相关的pom依赖

    4.0.0
    
        org.springframework.boot
        spring-boot-starter-parent
        2.7.0
         
    
    com.example
    etf
    0.0.1-SNAPSHOT
    etf
    etf
 
        
            1.8
            3.4.2
        
 
 
    
        
            com.alibaba
            fastjson
            1.2.75
        
        
            com.baomidou
            mybatis-plus-boot-starter
            ${mybatis-plus.version}
        
        
            mysql
            mysql-connector-java
            8.0.28
        
 
        
            org.projectlombok
            lombok
            1.18.4
            provided
        
 
        
            org.springframework.boot
            spring-boot-starter-web
        
 
        
            org.springframework.boot
            spring-boot-starter-test
            test
        
        
            org.projectlombok
            lombok
            RELEASE
            compile
        
    
 
    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    
 

建立相关目录

说明:

各层名称	说明	补充
controller	与前端交互的接口部分
service层	业务逻辑主要写的地方
mapper层	mapper接口，对应mybatis的sql.xml
mapper.xml层	在resource中，mybaites自动将数据返回给mapper层
dao	与数据库1v1对应的类，驼峰-》对应数据库的下划线

resource中的目录

idea下载安装插件

lombok

mybaits-tool（任意工具都可以plugin里很多，主要用于xml与mapper跳转）

配置mybais-config.xml

dao层案例:

package com.example.etf.story.dao;
 
import com.alibaba.fastjson.JSON;
import com.fasterxml.jackson.annotation.JsonFormat;
import lombok.Data;
 
import java.util.Date;
 
@Data
public class TestStory {
 
    private int storyId;
    private String initInfo;
    private String storyName;
    private String storyType;
    private int status;
    private String creater;
    private String auditor;
    @JsonFormat(pattern = "yyyy-MM-dd hh:mm:ss")
    private Date updateTime;
    @JsonFormat(pattern = "yyyy-MM-dd hh:mm:ss")
    private Date createTime;
}

数据库建表案例

附送他的建表语句:

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;
 
-- ----------------------------
-- Table structure for test_story
-- ----------------------------
DROP TABLE IF EXISTS `test_story`;
CREATE TABLE `test_story`  (
  `story_id` int(0) NOT NULL AUTO_INCREMENT COMMENT '第一层id',
  `init_info` json NOT NULL COMMENT '初始信息',
  `story_name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NULL DEFAULT NULL COMMENT '名称',
  `story_type` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NULL DEFAULT NULL COMMENT '属于种类，学习，游戏',
  `status` int(0) NULL DEFAULT NULL COMMENT '状态,0未发布，1未审核，2不通过，3审核通过，4失效',
  `creator` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NULL DEFAULT NULL COMMENT '作者',
  `auditor` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NULL DEFAULT NULL COMMENT '审核人',
  `update_time` timestamp(0) NULL DEFAULT NULL COMMENT '更新时间',
  `create_time` timestamp(0) NULL DEFAULT NULL COMMENT '创建时间',
  PRIMARY KEY (`story_id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 4 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_bin ROW_FORMAT = Dynamic;
 
SET FOREIGN_KEY_CHECKS = 1;

Paramr案例

（前端字段交互部分）

例:入口（查询条件)

package com.example.etf.story.paramer;
 
import com.fasterxml.jackson.annotation.JsonFormat;
import lombok.Data;
 
import java.util.ArrayList;
import java.util.List;
 
@Data
public class StorySelectParam {
        private int pageNum=1;
        private int pageSize=8;
        @JsonFormat(pattern = "yyyy-MM-dd hh:mm:ss")
        private List updateTime;
        @JsonFormat(pattern = "yyyy-MM-dd hh:mm:ss")
        private List createTime;
        private String creator;
        private String storyName;
        private String storyType;
 
        private int sqlStart;//limit的开始
        private int sqlEnd;//limit的结束
 
 
}

返回前端内容（页码以及本次总条数，用于分页）

package com.example.etf.story.paramer;
 
import com.example.etf.story.dao.TestStory;
import lombok.Data;
 
import java.util.List;
 
@Data
public class StoriesParam {
    private List testStories;
    private int total;
    private int pageNum;
    private int  pageSize;
}

Controller层案例

package com.example.etf.story.controller;
 
 
import com.example.etf.story.dao.TestStory;
import com.example.etf.story.paramer.StoriesParam;
import com.example.etf.story.paramer.StorySelectParam;
import com.example.etf.story.service.TestClientService;
import com.example.etf.story.service.TestEditorService;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
 
import javax.annotation.Resource;
import java.util.List;
 
@Controller
@RestController
public class TestClientController {
 
    @Resource
    private TestClientService clientService;
 
    //获取所有已发布story
    @PostMapping("/selectStorysByPublic")
    @ResponseBody
    public StoriesParam selectStorysByPublic(@RequestBody StorySelectParam storySelectParam){
        return clientService.selectStorysByPublic(storySelectParam);
    }
 
}

Service层案例

package com.example.etf.story.service;
 
import com.example.etf.controller.SqlSessionF;
import com.example.etf.story.dao.TestStory;
import com.example.etf.story.mapper.TestClientMapper;
 
import com.example.etf.story.paramer.StoriesParam;
import com.example.etf.story.paramer.StorySelectParam;
import org.springframework.stereotype.Service;
 
import java.util.List;
 
@Service
public class TestClientService {
    public StoriesParam selectStorysByPublic(StorySelectParam storySelectParam){
        TestClientMapper mapper = new SqlSessionF().getSqlSession().getMapper(TestClientMapper.class);
        int pageNum = storySelectParam.getPageNum();
        int pageSize = storySelectParam.getPageSize();
        if(pageNum==0 || pageSize==0){
            storySelectParam.setSqlStart(0);
            storySelectParam.setSqlEnd(8);
        }else {
            storySelectParam.setSqlStart((pageNum - 1) * pageSize);
            storySelectParam.setSqlEnd(pageNum * pageSize);
        }
        System.out.println(storySelectParam);
 
        List testStories = mapper.selectStorysByPublic(storySelectParam);
        StoriesParam storiesParam = new StoriesParam();
        storiesParam.setTestStories(testStories);
        storiesParam.setPageNum(pageNum);
        storiesParam.setPageSize(pageSize);
 
        storiesParam.setTotal(mapper.getTotal(storySelectParam));
 
        return storiesParam;
 
    }
}

Mapper层案例

package com.example.etf.story.mapper;
 
import com.example.etf.story.dao.TestStory;
import com.example.etf.story.dao.TestStoryStage;
import com.example.etf.story.paramer.StoriesParam;
import com.example.etf.story.paramer.StorySelectParam;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Component;
 
import java.util.List;
 
@Mapper
@Component
public interface TestClientMapper {
    //分页查询所有故事
 
    List selectStorysByPublic(StorySelectParam storySelectParam);
    int getTotal(StorySelectParam storySelectParam);//总数用于分页
}

SQL.xml案例

(resource下的mapper)

TestClientMapper.xml

 

    select * from
 
    test_story
 
    where
    
        story_name !=""
    
 
 
    
        story_name like concat('%',#{storyName},'%')
    
 
    
        and creator like concat('%',#{creator},'%')
    
 
    
        and story_type like concat('%',#{storyType},'%')
    
 
    
        = #{updateTime[0]} ]]>
        
    
    
        = #{createTime[0]} ]]>
        
    
    limit ${sqlStart},${sqlEnd}

 

    select count(1) from
 
    test_story
 
    where
    
        story_name !=""
    
 
 
    
        story_name like concat('%',#{storyName},'%')
    
 
    
        and creator like concat('%',#{creator},'%')
    
 
    
        and story_type like concat('%',#{storyType},'%')
    
 
    
        = #{updateTime[0]} ]]>
        
    
    
        = #{createTime[0]} ]]>
        
    
 

同志们辛苦了，新手都会觉得为什么要用这个？这么复杂。一个类不好吗?

对于老手都能理解(当你做项目后，就知道，一个项目的简单模块，就有几十个接口。轻松维护，多人协同，第一次搭建稍微麻烦点，后续开发异常舒服)

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