【电商项目】---商品评价

红太狼 2022-12-22 06:27 247阅读 0赞

# 前言 #

商品评价

--------------------

# 商品评价 #

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# 代码编写 #

*  service层

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

*  impl

@Transactional(propagation = Propagation.SUPPORTS)
        @Override
        public CommentLevelCountsVO queryCommentCounts(String 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 countsVO = new CommentLevelCountsVO();
            countsVO.setTotalCounts(totalCounts);
            countsVO.setGoodCounts(goodCounts);
            countsVO.setNormalCounts(normalCounts);
            countsVO.setBadCounts(badCounts);
    
            return countsVO;
        }

@Transactional(propagation = Propagation.SUPPORTS)
        Integer getCommentCounts(String itemId, Integer level) { 
            ItemsComments condition = new ItemsComments();
            condition.setItemId(itemId);
            if (level != null) { 
                condition.setCommentLevel(level);
            }
            return itemsCommentsMapper.selectCount(condition);
        }

*  pojo

/**
     * 用于展示商品评价数量的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;
        }
    }

*  枚举

/**
     * @Desc: 商品评价等级 枚举
     */
    public enum CommentLevel { 
        GOOD(1, "好评"),
        NORMAL(2, "中评"),
        BAD(3, "差评");
    
        public final Integer type;
        public final String value;
    
        CommentLevel(Integer type, String value) { 
            this.type = type;
            this.value = value;
        }
    }

*  controller

@ApiOperation(value = "查询商品评论", notes = "查询商品评论", httpMethod = "GET")
        @GetMapping("/comments")
        public ZCWJSONResult comments(
                @ApiParam(name = "itemId", value = "商品id", required = true)
                @RequestParam String itemId,
                @ApiParam(name = "level", value = "评价等级", required = false)
                @RequestParam Integer level,
                @ApiParam(name = "page", value = "查询下一页的第几页", required = false)
                @RequestParam Integer page,
                @ApiParam(name = "pageSize", value = "分页的每一页显示的条数", required = false)
                @RequestParam Integer pageSize) { 
    
            if (StringUtils.isBlank(itemId)) { 
                return ZCWJSONResult.errorMsg(null);
            }
    
            if (page == null) { 
                page = 1;
            }
    
            if (pageSize == null) { 
                pageSize = COMMON_PAGE_SIZE;
            }
    
            PagedGridResult grid = itemService.queryPagedComments(itemId,
                                                                    level,
                                                                    page,
                                                                    pageSize);
    
            return ZCWJSONResult.ok(grid);
        }

*  商品评价的sql语句

SELECT
    	ic.comment_level AS commentLevel,
    	ic.content AS content,
    	ic.sepc_name AS specName,
    	ic.created_time AS createdTime,
    	u.face AS userFace,
    	u.nickname AS nickname 
    FROM
    	items_comments ic
    	LEFT JOIN users u ON ic.user_id = u.id 
    WHERE
    	ic.item_id = 'cake-1001' 
    	AND ic.comment_level = 1

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyMzcwOTEz_size_16_color_FFFFFF_t_70_pic_center 1]

*  编写自定义Mapper进行数据查询

<?xml version="1.0" encoding="UTF-8" ?>
    <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
    <mapper namespace="com.imooc.mapper.ItemsMapperCustom" >
    
      <select id="queryItemComments" parameterType="Map" resultType="com.imooc.pojo.vo.ItemCommentVO">
        SELECT
            ic.comment_level as commentLevel,
            ic.content as content,
            ic.sepc_name as specName,
            ic.created_time as createdTime,
            u.face as userFace,
            u.nickname as nickname
        FROM
            items_comments ic
        LEFT JOIN
            users u
        ON
            ic.user_id = u.id
        WHERE
            ic.item_id = #{paramsMap.itemId}
            <if test=" paramsMap.level != null and paramsMap.level != '' ">
              AND ic.comment_level = #{paramsMap.level}
            </if>
      </select>
    
        <select id="searchItems" parameterType="Map" resultType="com.imooc.pojo.vo.SearchItemsVO">
            SELECT
                i.id as itemId,
                i.item_name as itemName,
                i.sell_counts as sellCounts,
                ii.url as imgUrl,
                tempSpec.price_discount as price
            FROM
                items i
            LEFT JOIN
                items_img ii
            on
                i.id = ii.item_id
            LEFT JOIN
                (SELECT item_id,MIN(price_discount) as price_discount from items_spec GROUP BY item_id) tempSpec
            on
                i.id = tempSpec.item_id
            WHERE
                ii.is_main = 1
                <if test=" paramsMap.keywords != null and paramsMap.keywords != '' ">
                    AND i.item_name like '%${paramsMap.keywords}%'
                </if>
                order by
                <choose>
                    <when test=" paramsMap.sort == "c" ">
                        i.sell_counts desc
                    </when>
                    <when test=" paramsMap.sort == "p" ">
                        tempSpec.price_discount asc
                    </when>
                    <otherwise>
                        i.item_name asc
                    </otherwise>
                </choose>
        </select>
        
        
        
    
    
        <select id="searchItemsByThirdCat" parameterType="Map" resultType="com.imooc.pojo.vo.SearchItemsVO">
            SELECT
                i.id as itemId,
                i.item_name as itemName,
                i.sell_counts as sellCounts,
                ii.url as imgUrl,
                tempSpec.price_discount as price
            FROM
              items i
            LEFT JOIN
              items_img ii
            on
              i.id = ii.item_id
            LEFT JOIN
              (SELECT item_id,MIN(price_discount) as price_discount from items_spec GROUP BY item_id) tempSpec
            on
              i.id = tempSpec.item_id
            WHERE
              ii.is_main = 1
              and
              i.cat_id = #{paramsMap.catId}
            order by
            <choose>
                <when test=" paramsMap.sort == "c" ">
                    i.sell_counts desc
                </when>
                <when test=" paramsMap.sort == "p" ">
                    tempSpec.price_discount asc
                </when>
                <otherwise>
                    i.item_name asc
                </otherwise>
            </choose>
        </select>
    
    
        <select id="queryItemsBySpecIds" parameterType="List" resultType="com.imooc.pojo.vo.ShopcartVO">
            SELECT
                t_items.id as itemId,
                t_items.item_name as itemName,
                t_items_img.url as itemImgUrl,
                t_items_spec.id as specId,
                t_items_spec.`name` as specName,
                t_items_spec.price_discount as priceDiscount,
                t_items_spec.price_normal as priceNormal
            FROM
                items_spec t_items_spec
            LEFT JOIN
                items t_items
            ON
                t_items.id = t_items_spec.item_id
            LEFT JOIN
                items_img t_items_img
            on
                t_items_img.item_id = t_items.id
            WHERE
                t_items_img.is_main = 1
            AND
                t_items_spec.id IN
                <foreach collection="paramsList" index="index" item="specId" open="(" separator="," close=")">
                  #{specId}
                </foreach>
        </select>
    
        <update id="decreaseItemSpecStock">
    
            update
                items_spec
            set
                stock = stock - #{pendingCounts}
            where
                id = #{specId}
            and
                stock >= #{pendingCounts}
    
        </update>
    
    </mapper>

public interface ItemsMapperCustom { 
    
        public List<ItemCommentVO> queryItemComments(@Param("paramsMap") Map<String, Object> map);
    
        public List<SearchItemsVO> searchItems(@Param("paramsMap") Map<String, Object> map);
    
        public List<SearchItemsVO> searchItemsByThirdCat(@Param("paramsMap") Map<String, Object> map);
    
        public List<ShopcartVO> queryItemsBySpecIds(@Param("paramsList") List specIdsList);
    
        public int decreaseItemSpecStock(@Param("specId") String specId,
                                         @Param("pendingCounts") int pendingCounts);
    }

/**
     * 用于展示商品评价的VO
     */
    public class ItemCommentVO { 
    
        private Integer commentLevel;
        private String content;
        private String specName;
        private Date createdTime;
        private String userFace;
        private String nickname;
    
        public Integer getCommentLevel() { 
            return commentLevel;
        }
    
        public void setCommentLevel(Integer commentLevel) { 
            this.commentLevel = commentLevel;
        }
    
        public String getContent() { 
            return content;
        }
    
        public void setContent(String content) { 
            this.content = content;
        }
    
        public String getSpecName() { 
            return specName;
        }
    
        public void setSpecName(String specName) { 
            this.specName = specName;
        }
    
        public Date getCreatedTime() { 
            return createdTime;
        }
    
        public void setCreatedTime(Date createdTime) { 
            this.createdTime = createdTime;
        }
    
        public String getUserFace() { 
            return userFace;
        }
    
        public void setUserFace(String userFace) { 
            this.userFace = userFace;
        }
    
        public String getNickname() { 
            return nickname;
        }
    
        public void setNickname(String nickname) { 
            this.nickname = nickname;
        }
    }

*  service

/**
         * 根据商品id查询商品的评价（分页）
         * @param itemId
         * @param level
         * @return
         */
        public PagedGridResult queryPagedComments(String itemId, Integer level,
                                                  Integer page, Integer pageSize);

@Transactional(propagation = Propagation.SUPPORTS)
        @Override
        public PagedGridResult queryPagedComments(String itemId,
                                                      Integer level,
                                                      Integer page,
                                                      Integer pageSize) { 
    
            Map<String, Object> map = new HashMap<>();
            map.put("itemId", itemId);
            map.put("level", level);
    
            // mybatis-pagehelper
    
            /**
             * page: 第几页
             * pageSize: 每页显示条数
             */
            PageHelper.startPage(page, pageSize);
    
            List<ItemCommentVO> list = itemsMapperCustom.queryItemComments(map);
            for (ItemCommentVO vo : list) { 
                vo.setNickname(DesensitizationUtil.commonDisplay(vo.getNickname()));
            }
    
            return setterPagedGrid(list, page);
        }

*  分页对象

public class PagedGridResult { 
    	
    	private int page;			// 当前页数
    	private int total;			// 总页数	
    	private long records;		// 总记录数
    	private List<?> rows;		// 每行显示的内容
    
    	public int getPage() { 
    		return page;
    	}
    	public void setPage(int page) { 
    		this.page = page;
    	}
    	public int getTotal() { 
    		return total;
    	}
    	public void setTotal(int total) { 
    		this.total = total;
    	}
    	public long getRecords() { 
    		return records;
    	}
    	public void setRecords(long records) { 
    		this.records = records;
    	}
    	public List<?> getRows() { 
    		return rows;
    	}
    	public void setRows(List<?> rows) { 
    		this.rows = rows;
    	}
    }

*  需要在配置文件中，添加分页对象的一些配置

# 分页插件配置
    pagehelper:
      helperDialect: mysql
      supportMethodsArguments: true

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