一、自动填充封装

1、在实体类添加自动填充注解

   ![图片.png](https://cdn.nlark.com/yuque/0/2021/png/22523384/1635951447291-3eb40ddb-4d75-49a0-8c28-f4f644b79dbc.png#clientId=u7a7f61d7-31ea-4&from=paste&height=203&id=u41c59a85&margin=%5Bobject%20Object%5D&name=%E5%9B%BE%E7%89%87.png&originHeight=203&originWidth=430&originalType=binary&ratio=1&size=10568&status=done&style=none&taskId=ue648cf19-8605-4b06-bbd2-f417565234c&width=430)

2、在service-base模块中添加

    **创建包handler，创建自动填充类 MyMetaObjectHandler**

package com.atguigu.servicebase.handler;
@Component  //交给spring管理，需要在启动类上添加@ComponentScan(basePackages = {"com.atguigu"})才能扫描到非启动类项目下的包
public class MyMetaObjectHandler implements MetaObjectHandler {
    @Override
    public void insertFill(MetaObject metaObject) {
        //类中属性名称，不是数据库字段名称
        this.setFieldValByName("gmtCreate", new Date(), metaObject);
        this.setFieldValByName("gmtModified", new Date(), metaObject);
    }
    @Override
    public void updateFill(MetaObject metaObject) {
        this.setFieldValByName("gmtModified", new Date(), metaObject);
    }
}

二、controller方法定义

1、新增

package com.atguigu.eduservice.controller;
@Api(description="讲师管理")
@RestController
@RequestMapping("/eduservice/teacher")
public class EduTeacherController {
    //把service注入
    @Autowired
    private EduTeacherService teacherService;
    //添加讲师接口的方法
    @ApiOperation(value = "新增讲师")
    @PostMapping("addTeacher")
    public R addTeacher(@ApiParam(name = "teacher", value = "讲师对象", required = true)
                        @RequestBody EduTeacher eduTeacher) {
        boolean save = teacherService.save(eduTeacher);
        if(save) {
            return R.ok();
        } else {
            return R.error();
        }
    }
}

2、根据id查询

//根据讲师id进行查询
@ApiOperation(value = "根据ID查询讲师")
@GetMapping("getTeacher/{id}")
public R getTeacher(@ApiParam(name = "id", value = "讲师ID", required = true)
                    @PathVariable String id){
    EduTeacher eduTeacher = teacherService.getById(id);
    return R.ok().data("teacher",eduTeacher);
}

3、根据id修改

@PutMapping("{id}")
public R updateById(
                @ApiParam(name = "id", value = "讲师ID", required = true)
             @PathVariable String id,
             @ApiParam(name = "teacher", value = "讲师对象", required = true)
             @RequestBody Teacher teacher){
    teacher.setId(id);
    teacherService.updateById(teacher);
    return R.ok();
}
//讲师修改功能
@ApiOperation(value = "根据ID修改讲师")
@PostMapping("updateTeacher")
public R updateTeacher(@RequestBody EduTeacher eduTeacher) {
    boolean flag = teacherService.updateById(eduTeacher);
    if(flag) {
        return R.ok();
    } else {
        return R.error();
    }
}