根据分类id获得商品的品牌,并获得该品牌下的所有商品
作者:互联网
1.获得该类下商品的所有品牌
数据库及流程分析
要获得品牌就要有product_id ,而product_id 是product表中的数据
sql语句如下:
SELECT disticnt brand FROM product_params WHERE product_id IN(SELECT product_id FROM product)
distinct是为了去重,显然不同商品一个牌子也是存在的
剩下的mapper,service,controller层过于简单,不做赘述
2.获得该品牌下的所有商品
2.1 获得商品的id
sql语句实现(以分类id=13举例)
SELECT p.product_id, p.product_name,p.category_id,p.root_category_id,p.sold_num,p.product_status,p.content,
pa.param_id,pa.product_id,pa.product_place,pa.foot_period,pa.brand
FROM product p INNER JOIN product_params pa ON pa.product_id = p.product_id WHERE p.category_id = 13
AND pa.brand = "酒鬼"
2.2获得商品id下的所有套餐中sellPrice最低的套餐
SELECT * FROM product_sku WHERE product_id =19 ORDER BY sell_price LIMIT 0,1
3.后端实现
productVo 新增了品牌这一项
productMapper
//根据三级分类id分页商品的brand 和category_id获得商品id,
//根据商品id获得商品的所有套餐,选择套餐中sellprice最低的那个 还需要当前页的起始索引,当前页的查询记录数
public List<ProductVo> selectProductInfoByBrandsAndCIds(@Param("cid")int cid,@Param("brand") String brand,@Param("start") int start, @Param("pagesize") int pagesize);
productMapper.xml 依然是根据categoryid和品牌得到productId,然后用productId进行子连接
<id column="product_id" jdbcType="VARCHAR" property="productId" />
<result column="product_name" jdbcType="VARCHAR" property="productName" />
<result column="category_id" jdbcType="INTEGER" property="categoryId" />
<result column="root_category_id" jdbcType="INTEGER" property="rootCategoryId" />
<result column="sold_num" jdbcType="INTEGER" property="soldNum" />
<result column="product_status" jdbcType="INTEGER" property="productStatus" />
<result column="create_time" jdbcType="TIMESTAMP" property="createTime" />
<result column="update_time" jdbcType="TIMESTAMP" property="updateTime" />
<result column="content" jdbcType="LONGVARCHAR" property="content" />
<collection property="paramsList" ofType="com.qfedu.fmmall.entity.ProductParams" >
<id column="param_id" jdbcType="VARCHAR" property="paramId" />
<result column="product_id" jdbcType="VARCHAR" property="productId" />
<result column="product_place" jdbcType="VARCHAR" property="productPlace" />
<result column="foot_period" jdbcType="VARCHAR" property="footPeriod" />
<result column="brand" jdbcType="VARCHAR" property="brand" />
</collection>
<!--根据商品id查询sellprice最低的套餐-->
<collection property="skuList"
select="com.qfedu.fmmall.dao.ProductSkuMapper.getLowerPriceByProductId"
column="product_id"/>
</resultMap>
<select id="selectProductInfoByBrandsAndCIds" resultMap="ProductMap3">
SELECT
p.product_id,
p.product_name,
p.category_id,
p.root_category_id,
p.sold_num,
p.product_status,
p.content,
pa.param_id,
pa.product_id,pa.product_place,pa.foot_period,pa.brand
FROM product p
INNER JOIN product_params pa
ON pa.product_id=p.product_id
WHERE p.category_id =#{cid}
AND pa.brand=#{brand}
limit #{start},#{pagesize}
</select>
productService
//传参数还是当前的页码,每页最多由多少项数据
public ResultVo getProductInfoByCidAndBrands(int categoryid,String brand,
int pageNum,int limit);
productServiceImpl
public ResultVo getProductInfoByCidAndBrands(int categoryid, String brand, int pageNum, int limit) {
//1.获得当前页的起始索引
int start=(pageNum-1)*limit;
List<ProductVo> productVos1 = productMapper.
selectProductInfoByBrandsAndCIds(categoryid, brand, start, limit);
//2.获得该条件下categoryAndProductId的总记录数
int count=productVos1.size();
//3.计算总页数
int pageCount1=0;
if(count%limit==0) pageCount1=count/limit;
else pageCount1=count/limit +1;
//把数据放进pageHelper里
PageHelper<ProductVo> productVoPageHelper = new PageHelper<>(count, pageCount1, productVos1);
return new ResultVo(ResStatus.OK,"success",productVoPageHelper);
}
productController
@ApiOperation("根据商品的分类id和品牌来查询商品信息的接口")
@GetMapping("/listByCidAndBrand/{cid}")
//前端要传给后端4个参数,分类id,品牌, 哪一页的评论 该页有多少评论
@ApiImplicitParams({
@ApiImplicitParam(dataType = "int", name="pageNum",value="当前的页码数",required = true),
@ApiImplicitParam(dataType = "int", name = "limit", value="每页最多显示多少条数据",required =true)
})
public ResultVo getProductByCidSAndBrands(@PathVariable("cid") int cid,String brand,int pageNum,int limit){
ResultVo resultVo = productService.getProductInfoByCidAndBrands(cid, brand,pageNum, limit);
return resultVo;
}
4.前端实现
![](https://www.icode9.com/i/l/?n=22&i=blog/1859559/202201/1859559-20220127223038990-1895270164.png)
标签:product,int,brand,品牌,商品,pa,limit,id 来源: https://www.cnblogs.com/swifties270/p/15850305.html