Java Web —— 第七天（Mybatis案例 部门管理）

环境搭建

准备数据库表(dept、emp)

-- 部门管理
create table dept(id int unsigned primary key auto_increment comment '主键ID',name varchar(10) not null unique comment '部门名称',create_time datetime not null comment '创建时间',update_time datetime not null comment '修改时间'
) comment '部门表';insert into dept (id, name, create_time, update_time) values(1,'学工部',now(),now()),(2,'教研部',now(),now()),(3,'咨询部',now(),now()), (4,'就业部',now(),now()),(5,'人事部',now(),now());-- 员工管理(带约束)
create table emp (id int unsigned primary key auto_increment comment 'ID',username varchar(20) not null unique comment '用户名',password varchar(32) default '123456' comment '密码',name varchar(10) not null comment '姓名',gender tinyint unsigned not null comment '性别, 说明: 1 男, 2 女',image varchar(300) comment '图像',job tinyint unsigned comment '职位, 说明: 1 班主任,2 讲师, 3 学工主管, 4 教研主管, 5 咨询师',entrydate date comment '入职时间',dept_id int unsigned comment '部门ID',create_time datetime not null comment '创建时间',update_time datetime not null comment '修改时间'
) comment '员工表';INSERT INTO emp(id, username, password, name, gender, image, job, entrydate,dept_id, create_time, update_time) VALUES(1,'jinyong','123456','金庸',1,'1.jpg',4,'2000-01-01',2,now(),now()),(2,'zhangwuji','123456','张无忌',1,'2.jpg',2,'2015-01-01',2,now(),now()),(3,'yangxiao','123456','杨逍',1,'3.jpg',2,'2008-05-01',2,now(),now()),(4,'weiyixiao','123456','韦一笑',1,'4.jpg',2,'2007-01-01',2,now(),now()),(5,'changyuchun','123456','常遇春',1,'5.jpg',2,'2012-12-05',2,now(),now()),(6,'xiaozhao','123456','小昭',2,'6.jpg',3,'2013-09-05',1,now(),now()),(7,'jixiaofu','123456','纪晓芙',2,'7.jpg',1,'2005-08-01',1,now(),now()),(8,'zhouzhiruo','123456','周芷若',2,'8.jpg',1,'2014-11-09',1,now(),now()),(9,'dingminjun','123456','丁敏君',2,'9.jpg',1,'2011-03-11',1,now(),now()),(10,'zhaomin','123456','赵敏',2,'10.jpg',1,'2013-09-05',1,now(),now()),(11,'luzhangke','123456','鹿杖客',1,'11.jpg',5,'2007-02-01',3,now(),now()),(12,'hebiweng','123456','鹤笔翁',1,'12.jpg',5,'2008-08-18',3,now(),now()),(13,'fangdongbai','123456','方东白',1,'13.jpg',5,'2012-11-01',3,now(),now()),(14,'zhangsanfeng','123456','张三丰',1,'14.jpg',2,'2002-08-01',2,now(),now()),(15,'yulianzhou','123456','俞莲舟',1,'15.jpg',2,'2011-05-01',2,now(),now()),(16,'songyuanqiao','123456','宋远桥',1,'16.jpg',2,'2007-01-01',2,now(),now()),(17,'chenyouliang','123456','陈友谅',1,'17.jpg',NULL,'2015-03-21',NULL,now(),now());

创建springboot工程，引入对应的起步依赖 (web、mybatis、mysql驱动、lombok)

配置文件application.properties中引入mybatis的配置信息，准备对应的实体类

# 驱动类名称
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
# 数据库连接的URL
spring.datasource.url=jdbc:mysql://localhost:3306/mybatis
# 连接数据库的用户名
spring.datasource.username=root
# 连接数据库的密码
spring.datasource.password=123456
# 配置MyBatis的日志，指定输出到控制台
mybatis.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl
#开启mybatis的驼峰命名自动映射开关
mybatis.configuration.map-underscore-to-camel-case=true

导入准备对应的Mapper、Service(接口、实现类)、Controller基础结构

开发规范

案例基于当前最为主流的前后端分离模式进行开发

开发规范-Restful

REST(REpresentational State Transfer) ，表述性状态转换，它是一种软件架构风格

注意事项

REST是风格，是约定方式，约定不是规定，可以打破

描述模块的功能通常使用复数，也就是加s的格式来描述，表示此类资源，而非单个资源。如: users、emps、books...

查询部门数据

DeptController 类

package com.example.controller;import com.example.pojo.Dept;
import com.example.pojo.Result;
import com.example.service.DeptService;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;import java.util.List;/*** @author hyk~*/
@Slf4j
@RestController
public class DeptController {@Autowiredprivate DeptService deptService;//private static Logger log = LoggerFactory.getLogger(DeptController.class);//@RequestMapping(value = "/depts",method = RequestMethod.GET)  //指定请求方式为GET@GetMapping("/depts")public Result list(){log.info("查询全部部门数据");//调用Service查询部门数据List<Dept> deptList = deptService.list();return Result.success(deptList); }
}

DeptServiceImpl 类 

@Service
public class DeptServiceImpl implements DeptService {@Autowiredprivate DeptMapper deptMapper;@Overridepublic List<Dept> list() {return deptMapper.list();}
}

DeptMapper 类 

@Mapper
public interface DeptMapper {//查询全部部门数据@Select("select * from dept")List<Dept> list();
}

根据id删除部门数据

DeptController类

    //根据id删除部门@DeleteMapping("/{id}")public Result deleteDept(@PathVariable Integer id) { //@PathVariable 通过该注解来获取路径中id的值/{id}log.info("根据id删除部门数据：{}", id);//调用Service删除部门deptService.DeleteDept(id);return Result.success();}

DeptService接口

         //根据id删除部门信息void DeleteDept(Integer id);

DeptServiceImpl实现类

@Override
public void DeleteDept(Integer id) {deptMapper.DeleteDept(id);
}

DeptMapper接口

     //根据Id删除部门信息@Delete("delete from dept where id = #{id}")void DeleteDept(Integer id);

整体代码（增删改查）

DeptController类（处理请求，返回响应）

package com.example.controller;import com.example.pojo.Dept;
import com.example.pojo.Emp;
import com.example.pojo.Result;
import com.example.service.DeptService;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.apache.ibatis.annotations.Insert;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;import java.util.List;/*** @author hyk~*/
@Slf4j
@RestController
@RequestMapping("/depts")
public class DeptController {@Autowiredprivate DeptService deptService;//private static Logger log = LoggerFactory.getLogger(DeptController.class);//@RequestMapping(value = "/depts",method = RequestMethod.GET)  //指定请求方式为GET@GetMappingpublic Result list() {log.info("查询全部部门数据");//调用Service查询部门数据List<Dept> deptList = deptService.list();return Result.success(deptList);}//根据id删除部门@DeleteMapping("/{id}")public Result deleteDept(@PathVariable Integer id) { //@PathVariable 通过该注解来获取路径中id的值/{id}log.info("根据id删除部门数据：{}", id);//调用Service删除部门deptService.DeleteDept(id);return Result.success();}//添加部门@PostMappingpublic Result addDept(@RequestBody Dept dept) {log.info("添加部门数据{}", dept);deptService.addDept(dept);return Result.success();}@GetMapping("/{id}")public Result selectByDeptId(@PathVariable Integer id) {//日志记录log.info("根据id查询部门：{}", id);//调用service层功能Dept dept = deptService.selectByDeptId(id);//响应return Result.success(dept);}@PutMappingpublic Result update(@RequestBody Dept dept) {//日志记录log.info("修改部门：{}", dept);//调用service层功能deptService.update(dept);//响应return Result.success();}
}

DeptService接口（业务逻辑）

    package com.example.service;import com.example.pojo.Dept;import org.springframework.stereotype.Service;import java.util.List;/*** @author hyk~*/@Servicepublic interface DeptService {//查询全部部门数据List<Dept> list();//根据id删除部门信息void DeleteDept(Integer id);//添加部门信息void addDept(Dept dept);//根据ID查询部门Dept selectByDeptId(Integer id);//修改部门void update(Dept dept);}

DeptServiceImpl实现类

package com.example.service.impl;import com.example.mapper.DeptMapper;
import com.example.mapper.EmpMapper;
import com.example.pojo.Dept;
import com.example.service.DeptService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;import java.time.LocalDateTime;
import java.util.List;/*** @author hyk~*/
@Service
public class DeptServiceImpl implements DeptService {@Autowiredprivate DeptMapper deptMapper;//查询@Overridepublic List<Dept> list() {return deptMapper.list();}//删除@Overridepublic void DeleteDept(Integer id) {deptMapper.DeleteDept(id);}//新增@Overridepublic void addDept(Dept dept) {dept.setCreateTime(LocalDateTime.now());dept.setUpdateTime(LocalDateTime.now() );deptMapper.addDept(dept);}//根据id查询@Overridepublic Dept selectByDeptId(Integer id) {return deptMapper.selectByDeptId(id);}//修改@Overridepublic void update(Dept dept) {//设置修改时间为当前dept.setUpdateTime(LocalDateTime.now());deptMapper.update(dept);}
}

DeptMapper接口（数据访问）

package com.example.mapper;import com.example.pojo.Dept;
import org.apache.ibatis.annotations.*;import java.util.List;/*** @author hyk~*/
@Mapper
public interface DeptMapper {//查询全部部门数据@Select("select * from dept")List<Dept> list();//根据Id删除部门信息@Delete("delete from dept where id = #{id}")void DeleteDept(Integer id);//添加部门信息@Insert(" insert into dept(name, create_time, update_time) values(#{name},#{createTime},#{updateTime});")void addDept(Dept dept);//根据id查询数据 数据回显 方便用户修改@Select("select * from dept where id=#{id}")Dept selectByDeptId(Integer id);//修改数据@Update("update dept set name = #{name},update_time=now() where id =#{id}")void update(Dept dept);
}

总结

1.开发流程

明确需求

接口文档

思路分析

接口开发

2.接口调试

postman测试

前后端联调

3.日志小技巧

@slf4j
@RestController
public class DeptController {}

注意事项

一个完整的请求路径，应该是类上的 @RequestMapping 的value属性 + 方法上的 @RequestMapping的value属性。