day02---新增和修改讲师接口开发(07)

一、自动填充封装

1、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;
import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
import org.apache.ibatis.reflection.MetaObject;
import org.springframework.stereotype.Component;
import java.util.Date;
@Component
public class MyMetaObjectHandler implements MetaObjectHandler {
    @Override
    public void insertFill(MetaObject metaObject) {
        this.setFieldValByName("gmtCreate", new Date(), metaObject);
        this.setFieldValByName("gmtModified", new Date(), metaObject);
    }
    @Override
    public void updateFill(MetaObject metaObject) {
        this.setFieldValByName("gmtModified", new Date(), metaObject);
    }
}

2、在实体类中需要自动填充的元素上添加自动填充注解

@ApiModelProperty(value = "创建时间", example = "2019-01-01 8:00:00")
@TableField(fill = FieldFill.INSERT)//自动填充的注解
private Date gmtCreate;
@ApiModelProperty(value = "更新时间", example = "2019-01-01 8:00:00")
@TableField(fill = FieldFill.INSERT_UPDATE)
private Date gmtModified;

二、controller方法定义

1、新增

@ApiOperation(value = "新增讲师")
@PostMapping
public R save(
     @ApiParam(name = "teacher", value = "讲师对象", required = true)
     @RequestBody EduTeacher eduTeacher){
    eduTeacherService.save(eduTeacher);
    return R.ok();
}

2、根据id查询

@ApiOperation(value = "根据ID查询讲师")
@GetMapping("{id}")
public R getById(
    @ApiParam(name = "id", value = "讲师ID", required = true)
    @PathVariable String id){
    EduTeacher eduTeacher = eduTeacherService.getById(id);
    return R.ok().data("item", eduTeacher);
}

3、根据id修改

@ApiOperation(value = "根据ID修改讲师")
@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 EduTeacher eduTeacher){
    eduTeacher.setId(id);
    eduTeacherService.updateById(eduTeacher);
    return R.ok();
}