校园商铺-8商品模块-12接触商品与某商品类别的关联的实现

去删除productCategory时，由于商品类别与商品建立了联系，在删除商品列别之前，需要将商品里的productCategoryId置为空。

1.Dao层

1.接口

package com.csj2018.o2o.dao;

import java.util.List;

import org.apache.ibatis.annotations.Param;

import com.csj2018.o2o.entity.Product;

public interface ProductDao {
	/**
	 * 8-10查询商品列表并分页，可输入的条件有：商品名（模糊）、商品状态，店铺ID，商品类别
	 * @param productCondition
	 * @param beginIndex
	 * @param pageSize
	 * @return
	 */
	List<Product> queryProductList(@Param("productCondition") Product productCondition, @Param("rowIndex") int rowIndex, @Param("pageSize") int pageSize);
	/**
	 * 8-10查询对应的商品总数
	 * @param productCondition
	 * @return
	 */
	int queryProductCount(@Param("productCondition") Product productCondition);
	Product queryProductById(Long productId);
	/**
	 * 插入商品
	 * @param product
	 * @return
	 */
	int insertProduct(Product product);
	/**
	 * 更新商品信息
	 * @param product
	 * @return
	 */
	int updateProduct(Product product);
	/**
	 * 8-11删除商品类别之前，将商品类别ID置为空
	 * @param productCategoryId
	 * @return
	 */
	int updateProductCategoryToNull(Long productCategoryId);
	int deleteProduct(Product product);
}

2.实现类

<?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.csj2018.o2o.dao.ProductDao"><!-- 对应接口类名 -->
 	<resultMap id="productMap" type="com.csj2018.o2o.entity.Product">
 		<id column="product_id" property="productId" />
 		<result column="product_name" property="productName" />
 		<result column="product_desc" property="productDesc" />
 		<result column="img_addr" property="imgAddr" />
 		<result column="normal_price" property="normalPrice" />
 		<result column="promotion_price" property="promotionPrice" />
 		<result column="priority" property="priority" />
 		<result column="create_time" property="createTime" />
 		<result column="last_edit_time" property="lastEditTime" />
 		<result column="enable_status" property="enableStatus" />
 		<association property="productCategory" column="product_category_id" javaType="com.csj2018.o2o.entity.ProductCategory">
 			<id column="product_category_id" property="productCategoryId" />
 			<result column="product_category_name" property="productCategoryName" />
 		</association>
 		<association property="shop" column="shop_id" javaType="com.csj2018.o2o.entity.Shop">
 			<id column="shop_id" property="shopId" />
 			<result column="shop_id" property="shopId" />
 		</association>
 		<collection property="productImgList" column="product_id" ofType="com.csj2018.o2o.entity.ProductImg">
 			<id column="product_img_id" property="productImgId" />
 			<result column="detail_img" property="imgAddr" /><!-- 有疑问，为什么不是img_addr -->
 			<result column="img_desc" property="imgDesc" />
 			<result column="priority" property="priority" />
 			<result column="create_time" property="createTime" />
 			<result column="product_id" property="productId" />
 		</collection>
 	</resultMap>
 	<select id="queryProductById" resultMap="productMap" parameterType="long">
 		select
 		p.product_id, p.product_name, p.product_desc, p.img_addr, p.normal_price, p.promotion_price, p.priority,
 		p.create_time, p.last_edit_time, p.enable_status, p.product_category_id, p.shop_id,
 		pm.product_img_id, pm.img_addr as detail_img, pm.img_desc, pm.priority, pm.create_time
 		from tb_product p left join tb_product_img pm 
 		on p.product_id = pm.product_id
 		where p.product_id = #{productId}
 		order by pm.priority desc
 	</select>
 	<update id="updateProduct" parameterType="com.csj2018.o2o.entity.Product" keyProperty="product_id" useGeneratedKeys="true">
 		update tb_product
 		<set>
 			<if test="productName != null">product_name = #{productName},</if>
 			<if test="productDesc != null">product_desc = #{productDesc},</if>
 			<if test="imgAddr != null">img_addr = #{imgAddr},</if>
 			<if test="normalPrice != null" >normal_price = #{normalPrice},</if>
 			<if test="promotionPrice != null">promotion_price = #{promotionPrice},</if>
 			<if test="priority != null">priority = #{priority},</if>
 			<if test="lastEditTime != null">last_edit_time = #{lastEditTime},</if>
 			<if test="enableStatus != null">enable_status = #{enableStatus},</if>
 			<if test="productCategory != null and productCategory.productCategoryId != null">product_category_id = #{productCategory.productCategoryId}</if> 
 		</set>
 		where product_id = #{productId} and shop_id = #{shop.shopId}<!--shop_id = #{shop.shopId}保证了不会操作别的店铺的商品 -->
 	</update>
    <insert id="insertProduct" parameterType="com.csj2018.o2o.entity.Product" useGeneratedKeys="true" keyProperty="productId" keyColumn="product_id">
        insert into tb_product(
            product_name,product_desc,img_addr,normal_price,promotion_price,
            priority,create_time,last_edit_time,enable_status,product_category_id,shop_id
        )values(
            #{productName},#{productDesc},#{imgAddr},#{normalPrice},#{promotionPrice},
            #{priority},#{createTime},#{lastEditTime},#{enableStatus},#{productCategory.productCategoryId},#{shop.shopId}
        )
    </insert>
	<select id="queryProductList" resultType="com.csj2018.o2o.entity.Product">
		select 
			product_id, product_name, product_desc, img_addr,
			normal_price, promotion_price, priority, create_time,
			last_edit_time, enable_status, product_category_id, shop_id
		from tb_product
		<where>
			<if test="productCondition.shop != null and productCondition.shop.shopId != null">
				and shop_id = #{productCondition.shop.shopId}	
			</if>
			<if test="productCondition.productCategory != null and productCondition.productCategory.productCategoryId != null">
				and product_category_id = #{productCondition.productCategory.productCategoryId}
			</if>
			<!-- 写like语句的时候 一般都会写成like '% %'，在mybatis里面写就是like '%${name}%',而不是like '%#{name}%'。${name}是不带单引号的，#{name}是带单引号的。-->
			<if test="productCondition.productName != null ">
				and product_name like '%${productCondition.productName}%'
			</if>
			<if test="productCondition.enableStatus != null">
				and enable_status = #{productCondition.enableStatus}
			</if>
		</where>
		order by priority desc limit #{rowIndex},#{pageSize};
	</select>    
	<select id="queryProductCount" resultType="int">
		select count(1) from tb_product
		<where>
			<if test="productCondition.shop != null and productCondition.shop.shopId != null">
				and shop_id = #{productCondition.shop.shopId}	
			</if>
			<if test="productCondition.productCategory != null and productCondition.productCategory.productCategoryId != null">
				and product_category_id = #{productCondition.productCategory.productCategoryId}
			</if>
			<!-- 写like语句的时候 一般都会写成like '% %'，在mybatis里面写就是like '%${name}%',而不是like '%#{name}%'。${name}是不带单引号的，#{name}是带单引号的。-->
			<if test="productCondition.productName != null">
				and product_name like '%${productCondition.productName}%'
			</if>
			<if test="productCondition.enableStatus != null">
				and enable_status = #{productCondition.enableStatus}
			</if>
		</where>
	</select>
	<!-- 8-11 -->
	<update id="updateProductCategoryToNull" parameterType="Long">
		update tb_product set product_category_id = null where product_category_id = #{productCategoryId}
	</update>
	<delete id="deleteProduct">
		delete from tb_product where product_id = #{productId} and shop_id = #{shopId}
	</delete>
 </mapper>

3.单元测试

package com.csj2018.o2o.dao;


import static org.junit.Assert.assertEquals;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.junit.FixMethodOrder;
import org.junit.Ignore;
import org.junit.Test;
import org.junit.runners.MethodSorters;
import org.springframework.beans.factory.annotation.Autowired;

import com.csj2018.o2o.BaseTest;
import com.csj2018.o2o.entity.Product;
import com.csj2018.o2o.entity.ProductCategory;
import com.csj2018.o2o.entity.ProductImg;
import com.csj2018.o2o.entity.Shop;

@FixMethodOrder(MethodSorters.NAME_ASCENDING)
public class ProductDaoTest extends BaseTest{
	@Autowired
	private ProductDao productDao;
	@Autowired
	private ProductImgDao productImgDao;
	
	@Test
	@Ignore
	public void testAInsertProduct() throws Exception{
		Shop shop1 = new Shop();
		shop1.setShopId(1L);
		ProductCategory pc1 = new ProductCategory();
		pc1.setProductCategoryId(10L);
		Product product1 = new Product();
		product1.setProductName("商品1");
		product1.setProductDesc("商品1的描述");
		product1.setImgAddr("商品1的缩略图");
		product1.setPriority(1);
		product1.setEnableStatus(1);
		product1.setCreateTime(new Date());
		product1.setLastEditTime(new Date());
		product1.setShop(shop1);
		product1.setProductCategory(pc1);
		
		Product product2 = new Product();
		product2.setProductName("商品2");
		product2.setProductDesc("商品2的描述");
		product2.setImgAddr("商品2的缩略图");
		product2.setPriority(2);
		product2.setEnableStatus(0);
		product2.setCreateTime(new Date());
		product2.setLastEditTime(new Date());
		product2.setShop(shop1);
		product2.setProductCategory(pc1);
		
		Product product3 = new Product();
		product3.setProductName("商品3");
		product3.setProductDesc("商品3的描述");
		product3.setImgAddr("商品3的缩略图");
		product3.setPriority(3);
		product3.setEnableStatus(1);
		product3.setCreateTime(new Date());
		product3.setLastEditTime(new Date());
		product3.setShop(shop1);
		product3.setProductCategory(pc1);
		
		int effectedNum = productDao.insertProduct(product1);
		assertEquals(1,effectedNum);
		effectedNum = productDao.insertProduct(product2);
		assertEquals(1,effectedNum);
		effectedNum = productDao.insertProduct(product3);
		assertEquals(1,effectedNum);
	}
	//8-10
	@Test
	@Ignore
	public void testBQueryProductList() {
		//product表原有9条数据，商品名包含测试的有1条
		Product productCondition = new Product();
		//分页查询，预期返回3条数据
		List<Product> productList = productDao.queryProductList(productCondition, 0, 3);
		assertEquals(3,productList.size());
		int count = productDao.queryProductCount(productCondition);
		assertEquals(9,count);
		//查询名称为测试的商品总数
		productCondition.setProductName("测试");
		productList = productDao.queryProductList(productCondition, 0, 3);
		count = productDao.queryProductCount(productCondition);
		assertEquals(1,count);
	}
	@Test
	@Ignore
	public void testCQueryProductByProductId() throws Exception{
		long productId = 1;
		//初始化两个商品详情图实例，作为productId为1的商品下的详情图片
		//批量插入到商品详情图标中
		ProductImg productImg1 = new ProductImg();
		productImg1.setImgAddr("图片1");
		productImg1.setImgDesc("测试图片1");
		productImg1.setPriority(1);
		productImg1.setCreateTime(new Date());
		productImg1.setProductId(productId);
		ProductImg productImg2 = new ProductImg();
		productImg2.setImgAddr("图片1");
		productImg2.setImgDesc("测试图片1");
		productImg2.setPriority(1);
		productImg2.setCreateTime(new Date());
		productImg2.setProductId(productId);
		List<ProductImg> productImgList = new ArrayList<>();
		productImgList.add(productImg1);
		productImgList.add(productImg2);
		int effectedNum = productImgDao.batchInsertProductImg(productImgList);
		assertEquals(2,effectedNum);
		//查询productId为1的商品信息并校验返回的详情图实例列表size是否为2
		Product product = productDao.queryProductById(productId);
		assertEquals(2,product.getProductImgList().size());
		//删除新增的这两个商品详情图示例，形成闭环
		effectedNum = productImgDao.deleteProductImgByProductId(productId);
		assertEquals(2,effectedNum);
	}
	@Test
	@Ignore
	public void testDUpdateProduct() {
		Product product = new Product();
		ProductCategory pc = new ProductCategory();
		Shop shop = new Shop();
		shop.setShopId(1L);
		pc.setProductCategoryId(12L);
		
		product.setProductId(1L);
		product.setShop(shop);
		product.setProductCategory(pc);
		product.setProductName("躺着喝的美式咖啡");
		
		int effectedNum = productDao.updateProduct(product);
		assertEquals(1,effectedNum);
	}
	//8-11
	@Test
//	@Ignore
	public void testEUpdateProductCategoryToNull() {
		//将productCategoryId为2的商品类别下面的商品的商品类别置为空
		int effectNum = productDao.updateProductCategoryToNull(12L);
		assertEquals(effectNum,1);
	}
	@Test
	@Ignore
	public void testFDeleteShopAutoMap() {}
}

2. Service层

package com.csj2018.o2o.service.impl;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.csj2018.o2o.dao.ProductCategoryDao;
import com.csj2018.o2o.dao.ProductDao;
import com.csj2018.o2o.dto.ProductCategoryExecution;
import com.csj2018.o2o.entity.ProductCategory;
import com.csj2018.o2o.enums.ProductCategoryStateEnum;
import com.csj2018.o2o.exceptions.ProductCategoryOperationException;
import com.csj2018.o2o.service.ProductCategoryService;
@Service
public class ProductCategoryServiceImpl implements ProductCategoryService{
	@Autowired
	private ProductCategoryDao productCategoryDao;
	@Autowired
	private ProductDao productDao;
	@Override
	public List<ProductCategory> getProductCategoryList(long shopId) {
		// TODO Auto-generated method stub
		return productCategoryDao.queryProductCategoryList(shopId);
	}
	//7.3增加
	@Override
	@Transactional
	public ProductCategoryExecution batchAddProductCategory(List<ProductCategory> productCategoryList)
			throws ProductCategoryOperationException {
		if(productCategoryList != null && productCategoryList.size() >0) {
			try {
				int effectedNum = productCategoryDao.batchInsertProductCategory(productCategoryList);
				if(effectedNum <= 0) {
					throw new ProductCategoryOperationException("店铺类别创建失败"); 
				}else {
					return new ProductCategoryExecution(ProductCategoryStateEnum.SUCCESS);
				}
			
			}catch (Exception e) {
				throw new ProductCategoryOperationException("batchAddProductCategory error:" + e.getMessage());
			}
		}else {
			return new ProductCategoryExecution(ProductCategoryStateEnum.EMPTY_LIST);
		}
	}
	//7-5
	@Override
	public ProductCategoryExecution deleteProductCategory(long productCategoryId, long shopId)
			throws ProductCategoryOperationException {
		// 8-11将该类别下的商品类别置为空
		try {
			int effectedNum = productDao.updateProductCategoryToNull(productCategoryId);
			if(effectedNum <0) {
				throw new ProductCategoryOperationException("商品类别更新失败");
			}
		}catch(Exception e) {
			throw new ProductCategoryOperationException("deleteProductCategory error:"+e.getMessage());
		}
		try {
			int effectedNum = productCategoryDao.deleteProductCategory(productCategoryId, shopId);
			if(effectedNum <= 0) {
				throw new ProductCategoryOperationException("商品类别删除失败");
			}else {
				return new ProductCategoryExecution(ProductCategoryStateEnum.SUCCESS);
			}
		}catch(Exception e) {
			throw new ProductCategoryOperationException("delete ProductCategory error:"+e.getMessage());
		}
	}
}