CategoryController

    @PutMapping
    public Result update(@RequestBody @Validated Category category){
        categoryService.update(category);
        return Result.success();
    }

 CategoryService

    //更新分类
    void update(Category category);

CategoryServiceImpl

    @Override
    public void update(Category category) {
        category.setUpdateTime(LocalDateTime.now());
        categoryMapper.update(category);
    }

CategoryMapper

    //更新
    @Update("update category set category_name=#{categoryName},category_alias=#{categoryAlias},update_time=#{updateTime} where id = #{id}")
    void update(Category category);