springboot秒杀课程学习整理1-4

2022-09-10 08:20:54

1）商品模型设计

（应该是先设计商品的model，然后才是数据库表）

模型字段（id,title,price(double),stock(库存),description,sales,imgUrl）

创建表 item(id,title,price,description,sales,imgUrl)

item_stock(id,stock,item_id)

2) 使用mybatis-generator生成dataObject及dao文件

【1】这里需要修改pom文件里的插件配置，将overwrite改成false不允许覆盖（否则之前修改的文件都会被覆盖掉）

【2】修改mybatis_generator.xml文件，将原来已经生成过的注释掉新增生成的表的配置

【3】执行mybatis-generator命令

3) 生成的Mapping文件插入数据不会返回id

可以在该方法加上一下几个属性

useGeneratedKeys="true" keyColumn="SUBJECT_ID" keyProperty="subjectId"

4）存中文进入数据库是会乱码

新建数据库时要设置字符集，然后连接数据库的链接添加useUnicode=true&characterEncoding=utf8

5）获取商品列表实现

在itemMapping的xml文件里添加sql查询语句，这里暂时不支持分页，后续补上

<select id="listItem" resultMap="BaseResultMap">

    select

    <include refid="Base_Column_List" />

    from item order by sales DESC;

  </select>

itemService

package com.miaoshaproject.service;

import com.miaoshaproject.error.BusinessException;

import com.miaoshaproject.service.model.ItemModel;

import java.util.List;

public interface ItemService {

    //创建商品

    ItemModel createItem(ItemModel itemModel) throws BusinessException;

    //商品列表浏览

    List<ItemModel> listItem();

    //商品详情预览

    ItemModel getItemById(Integer id);

}

itemServiceImpl

package com.miaoshaproject.service.impl;

import com.miaoshaproject.dao.ItemDOMapper;

import com.miaoshaproject.dao.StockDOMapper;

import com.miaoshaproject.dataobject.ItemDO;

import com.miaoshaproject.dataobject.StockDO;

import com.miaoshaproject.error.BusinessException;

import com.miaoshaproject.error.EmBusinessError;

import com.miaoshaproject.service.ItemService;

import com.miaoshaproject.service.model.ItemModel;

import com.miaoshaproject.validator.ValidationResult;

import com.miaoshaproject.validator.ValidatorImpl;

import org.springframework.beans.BeanUtils;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Service;

import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;

import java.util.List;

import java.util.stream.Collectors;

@Service

public class ItemServiceImpl implements ItemService {

    @Autowired

    private ValidatorImpl validator;

    @Autowired

    private ItemDOMapper itemDOMapper;

    @Autowired

    private StockDOMapper stockDOMapper;

    @Override

    @Transactional //?不懂

    public ItemModel createItem(ItemModel itemModel) throws BusinessException {

        ValidationResult result=validator.validate(itemModel);

        if(result.isHasError()){

            throw new BusinessException(EmBusinessError.PARAMTER_VALIDATION_ERROR,result.getErrMsg());

        }

        ItemDO itemDO=this.convertItemDOFromItemModel(itemModel);

        itemDOMapper.insertSelective(itemDO);

        itemModel.setId(itemDO.getId());

        StockDO stockDO=this.convertItemStockFromItemModel(itemModel);

        stockDOMapper.insertSelective(stockDO);

        return this.getItemById(itemModel.getId());

    }

    @Override

    public List<ItemModel> listItem() {

        List<ItemDO> itemDOList =itemDOMapper.listItem();

        List<ItemModel> itemModelList= itemDOList.stream().map(itemDO ->{

            StockDO stockDO = stockDOMapper.selectByItemId(itemDO.getId());

            ItemModel itemModel=this.converItemModelFromItemDO(itemDO,stockDO);

            return itemModel;

        }).collect(Collectors.toList());

        return itemModelList;

    }

    @Override

    public ItemModel getItemById(Integer id) {

        ItemDO itemDO=itemDOMapper.selectByPrimaryKey(id);

        if(itemDO == null){

            return null;

        }

        StockDO stockDO=stockDOMapper.selectByItemId(itemDO.getId());

        ItemModel itemModel=this.converItemModelFromItemDO(itemDO,stockDO);

        return itemModel;

    }

    public ItemDO convertItemDOFromItemModel(ItemModel itemModel){

        if(itemModel==null){

            return null;

        };

        ItemDO itemDO=new ItemDO();

        BeanUtils.copyProperties(itemModel,itemDO);

        itemDO.setPrice(itemModel.getPrice().doubleValue());

        return itemDO;

    }

    public StockDO convertItemStockFromItemModel(ItemModel itemModel){

        StockDO stockDO=new StockDO();

        stockDO.setItemId(itemModel.getId());

        stockDO.setStock(itemModel.getStock());

        return stockDO;

    }

    public ItemModel converItemModelFromItemDO(ItemDO itemDO,StockDO stockDO){

        ItemModel itemModel=new ItemModel();

        BeanUtils.copyProperties(itemDO,itemModel);

        itemModel.setPrice(new BigDecimal(itemDO.getPrice()));

        itemModel.setStock(stockDO.getStock());

        return itemModel;

    }

}

itemController

package com.miaoshaproject.controller;

import com.miaoshaproject.controller.viewobject.ItemVO;

import com.miaoshaproject.error.BusinessException;

import com.miaoshaproject.response.CommonReturnType;

import com.miaoshaproject.service.impl.ItemServiceImpl;

import com.miaoshaproject.service.model.ItemModel;

import org.springframework.beans.BeanUtils;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.web.bind.annotation.*;

import java.math.BigDecimal;

import java.util.List;

import java.util.stream.Collectors;

@RestController

@RequestMapping("/item")

@CrossOrigin(allowCredentials = "true",allowedHeaders = "*")

public class ItemController extends BaseController{

    @Autowired

    private ItemServiceImpl itemService;

    //创建商品的controller

    @RequestMapping(value="add",method = {RequestMethod.POST},consumes = {CONTENT_TYPE_FORMED})

    public CommonReturnType createItem(@RequestParam(name="title")String title,

                                       @RequestParam(name="description")String description,

                                       @RequestParam(name="price") BigDecimal price,

                                       @RequestParam(name="stock")Integer stock,

                                       @RequestParam(name="imgUrl")String imgUrl

                                       ) throws BusinessException {

        //疯转service请求用来创建商品

        ItemModel itemModel=new ItemModel();

        itemModel.setTitle(title);

        itemModel.setDescription(description);

        itemModel.setPrice(price);

        itemModel.setStock(stock);

        itemModel.setImgUrl(imgUrl);

        ItemModel itemModelForReturn = itemService.createItem(itemModel);

        ItemVO itemVO=this.convertItemVOFromItemModel(itemModelForReturn);

        return CommonReturnType.create(itemVO);

    }

    //商品详情

    @RequestMapping(value="detail",method = {RequestMethod.GET})

    @ResponseBody

    public CommonReturnType getItem(@RequestParam(name="id")Integer id){

        ItemModel itemModel=itemService.getItemById(id);

        ItemVO itemVO=convertItemVOFromItemModel(itemModel);

        return CommonReturnType.create(itemVO);

    }

    //商品列表

    @RequestMapping(value="list",method = {RequestMethod.GET})

    @ResponseBody

    public CommonReturnType getList(){

        List<ItemModel> itemModelList = itemService.listItem();

        List<ItemVO> itemVOList = itemModelList.stream().map(itemModel->{

            ItemVO itemVO=this.convertItemVOFromItemModel(itemModel);

            return itemVO;

        }).collect(Collectors.toList());

        return CommonReturnType.create(itemVOList);

    }

    public ItemVO convertItemVOFromItemModel(ItemModel itemModel){

        ItemVO itemVO=new ItemVO();

        if(itemModel == null){

            return null;

        }

        BeanUtils.copyProperties(itemModel,itemVO);

        return itemVO;

    }

}

码农公寓

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