商品评价等级数量查询

一、数据库结构

  

create table `foodie-shop-dev`.items_comments
(
    id            varchar(64)  not null comment 'id主键'
        primary key,
    user_id       varchar(64)  null comment '用户id 用户名须脱敏',
    item_id       varchar(64)  not null comment '商品id',
    item_name     varchar(64)  null comment '商品名称',
    item_spec_id  varchar(64)  null comment '商品规格id 可为空',
    sepc_name     varchar(32)  null comment '规格名称 可为空',
    comment_level int          not null comment '评价等级 1：好评 2：中评 3：差评',
    content       varchar(128) not null comment '评价内容',
    created_time  datetime     null comment '创建时间',
    updated_time  datetime     null comment '更新时间'
)
    comment '商品评价表 ' charset = utf8mb4;

二、Service模块

   1.接口定义

        路径：  com/imooc/service/ItemService.java

package com.imooc.service;


import com.imooc.pojo.Items;
import com.imooc.pojo.ItemsImg;
import com.imooc.pojo.ItemsParam;
import com.imooc.pojo.ItemsSpec;
import com.imooc.pojo.vo.CommentLevelCountsVO;

import java.util.List;

public interface ItemService {

    /**
     * 根据商品ID查询详情
     * @param itemId
     * @return
     */
    public Items queryItemById(String itemId);

    /**
     * 根据商品ID查询图片列表
     * @param itemId
     * @return
     */
    public List<ItemsImg> queryItemImgList(String itemId);

    /**
     * 根据商品ID查询商品规格列表
     * @param itemId
     * @return
     */
    public List<ItemsSpec> queryItemSpecList(String itemId);

    /**
     * 根据商品ID查询商品参数
     * @param itemId
     * @return
     */
    public ItemsParam queryItemParam(String itemId);

    /**
     * 根据商品id查询商品的评价等级数量
     * @param itemId
     */
    public CommentLevelCountsVO queryItemCommentCounts(String itemId);


}

 2.VO定义 （返回到前端）

   路径：com/imooc/pojo/vo/CommentLevelCountsVO.java

   接口方法：queryItemCommentCounts

package com.imooc.pojo.vo;

/**
 *
 */
public class CommentLevelCountsVO {
    public Integer totalCounts;
    public Integer goodCounts;
    public Integer normalCounts;
    public Integer badCounts;

    public Integer getTotalCounts() {
        return totalCounts;
    }

    public void setTotalCounts(Integer totalCounts) {
        this.totalCounts = totalCounts;
    }

    public Integer getGoodCounts() {
        return goodCounts;
    }

    public void setGoodCounts(Integer goodCounts) {
        this.goodCounts = goodCounts;
    }

    public Integer getNormalCounts() {
        return normalCounts;
    }

    public void setNormalCounts(Integer normalCounts) {
        this.normalCounts = normalCounts;
    }

    public Integer getBadCounts() {
        return badCounts;
    }

    public void setBadCounts(Integer badCounts) {
        this.badCounts = badCounts;
    }




}

3、接口实现

  路径：com/imooc/service/impl/ItemServiceImpl.java

方法：queryItemCommentCounts

package com.imooc.service.impl;

import com.imooc.enums.CommentLevel;
import com.imooc.mapper.*;
import com.imooc.pojo.*;
import com.imooc.pojo.vo.CommentLevelCountsVO;
import com.imooc.service.ItemService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
import tk.mybatis.mapper.entity.Example;

import java.util.List;

@Service
public class ItemServiceImpl implements ItemService {
    @Autowired
    ItemsMapper itemsMapper;

    @Autowired
    ItemsImgMapper itemsImgMapper;

    @Autowired
    ItemsSpecMapper itemsSpecMapper;

    @Autowired
    ItemsParamMapper itemsParamMapper;

    @Autowired
    ItemsCommentsMapper itemsCommentsCommentsMapper;

    @Transactional(propagation = Propagation.SUPPORTS)
    @Override
    public Items queryItemById(String itemId) {
        return itemsMapper.selectByPrimaryKey(itemId);
    }

    @Transactional(propagation = Propagation.SUPPORTS)
    @Override
    public List<ItemsImg> queryItemImgList(String itemId) {
        Example itemsImgExp = new Example(ItemsImg.class);
        Example.Criteria criteria =itemsImgExp.createCriteria();
        criteria.andEqualTo("itemId",itemId);
        return itemsImgMapper.selectByExample(itemsImgExp);
    }

    @Transactional(propagation = Propagation.SUPPORTS)
    @Override
    public List<ItemsSpec> queryItemSpecList(String itemId) {
        Example itemsSpecExp = new Example(ItemsSpec.class);
        Example.Criteria criteria =itemsSpecExp.createCriteria();
        criteria.andEqualTo("itemId",itemId);
        return itemsSpecMapper.selectByExample(itemsSpecExp);
    }

    @Transactional(propagation = Propagation.SUPPORTS)
    @Override
    public ItemsParam queryItemParam(String itemId) {
        Example itemsParamExp = new Example(ItemsParam.class);
        Example.Criteria criteria =itemsParamExp.createCriteria();
        criteria.andEqualTo("itemId",itemId);
        return itemsParamMapper.selectOneByExample(itemsParamExp);
    }

    @Transactional(propagation = Propagation.SUPPORTS)
    @Override
    public CommentLevelCountsVO queryItemCommentCounts(String itemId) {

       //Integer totalCounts=getCommentCounts(itemId);
        Integer goodCounts=getCommentCounts(itemId, CommentLevel.Good.type);
        Integer normalCounts=getCommentCounts(itemId, CommentLevel.NORMAL.type);
        Integer badCounts=getCommentCounts(itemId, CommentLevel.BAD.type);
        Integer totalCounts=goodCounts+normalCounts+badCounts;

        CommentLevelCountsVO commentLevelCountsVO=new CommentLevelCountsVO();
        commentLevelCountsVO.setTotalCounts(totalCounts);
        commentLevelCountsVO.setGoodCounts(goodCounts);
        commentLevelCountsVO.setNormalCounts(normalCounts);
        commentLevelCountsVO.setBadCounts(badCounts);
        return commentLevelCountsVO;
    }

    @Transactional(propagation = Propagation.SUPPORTS)
     Integer getCommentCounts(String itemId,Integer level){

        ItemsComments confdition =new ItemsComments();
        confdition.setItemId(itemId);
        if (level != null) {
            confdition.setCommentLevel(level);
        }

      return   itemsCommentsCommentsMapper.selectCount(confdition);

    }

}

三、Api模块实现

  路径：com/imooc/service/impl/ItemServiceImpl.java

 方法：queryItemCommentCounts

  参数是  @RequestParam， 不是路径参数  /{itemId}

package com.imooc.service.impl;

import com.imooc.enums.CommentLevel;
import com.imooc.mapper.*;
import com.imooc.pojo.*;
import com.imooc.pojo.vo.CommentLevelCountsVO;
import com.imooc.service.ItemService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
import tk.mybatis.mapper.entity.Example;

import java.util.List;

@Service
public class ItemServiceImpl implements ItemService {
    @Autowired
    ItemsMapper itemsMapper;

    @Autowired
    ItemsImgMapper itemsImgMapper;

    @Autowired
    ItemsSpecMapper itemsSpecMapper;

    @Autowired
    ItemsParamMapper itemsParamMapper;

    @Autowired
    ItemsCommentsMapper itemsCommentsCommentsMapper;

    @Transactional(propagation = Propagation.SUPPORTS)
    @Override
    public Items queryItemById(String itemId) {
        return itemsMapper.selectByPrimaryKey(itemId);
    }

    @Transactional(propagation = Propagation.SUPPORTS)
    @Override
    public List<ItemsImg> queryItemImgList(String itemId) {
        Example itemsImgExp = new Example(ItemsImg.class);
        Example.Criteria criteria =itemsImgExp.createCriteria();
        criteria.andEqualTo("itemId",itemId);
        return itemsImgMapper.selectByExample(itemsImgExp);
    }

    @Transactional(propagation = Propagation.SUPPORTS)
    @Override
    public List<ItemsSpec> queryItemSpecList(String itemId) {
        Example itemsSpecExp = new Example(ItemsSpec.class);
        Example.Criteria criteria =itemsSpecExp.createCriteria();
        criteria.andEqualTo("itemId",itemId);
        return itemsSpecMapper.selectByExample(itemsSpecExp);
    }

    @Transactional(propagation = Propagation.SUPPORTS)
    @Override
    public ItemsParam queryItemParam(String itemId) {
        Example itemsParamExp = new Example(ItemsParam.class);
        Example.Criteria criteria =itemsParamExp.createCriteria();
        criteria.andEqualTo("itemId",itemId);
        return itemsParamMapper.selectOneByExample(itemsParamExp);
    }

    @Transactional(propagation = Propagation.SUPPORTS)
    @Override
    public CommentLevelCountsVO queryItemCommentCounts(String itemId) {

       //Integer totalCounts=getCommentCounts(itemId);
        Integer goodCounts=getCommentCounts(itemId, CommentLevel.Good.type);
        Integer normalCounts=getCommentCounts(itemId, CommentLevel.NORMAL.type);
        Integer badCounts=getCommentCounts(itemId, CommentLevel.BAD.type);
        Integer totalCounts=goodCounts+normalCounts+badCounts;

        CommentLevelCountsVO commentLevelCountsVO=new CommentLevelCountsVO();
        commentLevelCountsVO.setTotalCounts(totalCounts);
        commentLevelCountsVO.setGoodCounts(goodCounts);
        commentLevelCountsVO.setNormalCounts(normalCounts);
        commentLevelCountsVO.setBadCounts(badCounts);
        return commentLevelCountsVO;
    }

    @Transactional(propagation = Propagation.SUPPORTS)
     Integer getCommentCounts(String itemId,Integer level){

        ItemsComments confdition =new ItemsComments();
        confdition.setItemId(itemId);
        if (level != null) {
            confdition.setCommentLevel(level);
        }

      return   itemsCommentsCommentsMapper.selectCount(confdition);

    }

}