概述
在完成了 Dao层的部分之后，顺其自然的我们来到了Service层，需要调用Dao层提供的操作数据库的方法。
主要步骤如下：
1. 如用户上传了缩略图，则将原有的缩略图删除（磁盘上删除），并更新tb_product表的img_addr字段，否则不做任何处理。
2. 如果用户上传了新的商品详情图片，则将原有的属于该productId下的全部的商品详情图删除（磁盘上删除），同时删除productId对应的tb_product_img中的全部数据。
3. 更新tb_product的信息
Service接口
新增两个接口如下：
/**
*
*
* @Title: queryProductById
*
* @Description: 根据productId查询product
*
* @param productId
*
* @return: Product
*/
Product queryProductById(long productId);
/**
*
*
* @Title: modifyProduct
*
* @Description: TODO
*
* @param product
* 产品信息
* @param imageHolder
* 产品缩略图的封装信息
* @param prodImgDetailList
* 产品详情图片的封装信息
* @throws ProductOperationException
*
* @return: ProductExecution
*/
ProductExecution modifyProduct(Product product, ImageHolder imageHolder, List<ImageHolder> prodImgDetailList) throws ProductOperationException;Service接口实现类
/**
* 注意事务控制@Transactional
*/
@Override
@Transactional
public ProductExecution modifyProduct(Product product, ImageHolder imageHolder, List<ImageHolder> prodImgDetailList) throws ProductOperationException {
if (product != null && product.getShop() != null && product.getShop().getShopId() != null && product.getProductCategory().getProductCategoryId() != null) {
// 设置默认的属性
product.setLastEditTime(new Date());
// Step1. 处理缩略图
if (imageHolder != null) {
Product tempProduct = productDao.selectProductById(product.getProductId());
// 1.1 删除旧的缩略图
if (tempProduct.getImgAddr() != null) {
ImageUtil.deleteStorePath(tempProduct.getImgAddr());
}
// 1.2 添加新的缩略图
addProductImg(product, imageHolder);
}
// Step2. 处理商品详情
// 如果添加商品成功，继续处理商品详情图片，并写入tb_product_img
if (prodImgDetailList != null && prodImgDetailList.size() > 0) {
// 2.1 删除库表中productId对应的tb_product_img的信息
deleteProductImgs(product.getProductId());
// 2.2 处理商品详情图片，并写入tb_product_img
addProductDetailImgs(product, prodImgDetailList);
}
try {
// Step3.更新tb_product
int effectNum = productDao.updateProduct(product);
if (effectNum <= 0) {
throw new ProductOperationException("商品更新失败");
}
return new ProductExecution(ProductStateEnum.SUCCESS, product);
} catch (Exception e) {
throw new ProductOperationException("商品更新失败：" + e.getMessage());
}
} else {
return new ProductExecution(ProductStateEnum.NULL_PARAMETER);
}
}
private void deleteProductImgs(Long productId) {
// 获取该商铺下对应的productImg信息
List<ProductImg> productImgList = productImgDao.selectProductImgList(productId);
// 遍历删除该目录下的全部文件
for (ProductImg productImg : productImgList) {
ImageUtil.deleteStorePath(productImg.getImgAddr());
}
// 删除tb_product_img中该productId对应的记录
productImgDao.deleteProductImgById(productId);
}
@Override
public Product queryProductById(long productId) {
return productDao.selectProductById(productId);
}单元测试
@Test
public void testModifyProduct() throws Exception {
// 注意表中的外键关系，确保这些数据在对应的表中的存在
ProductCategory productCategory = new ProductCategory();
productCategory.setProductCategoryId(36L);
// 注意表中的外键关系，确保这些数据在对应的表中的存在
Shop shop = new Shop();
shop.setShopId(5L);
// 构造Product
Product product = new Product();
product.setProductName("offical_product");
product.setProductDesc("product offical desc");
product.setNormalPrice("100");
product.setPromotionPrice("80");
product.setPriority(66);
product.setLastEditTime(new Date());
product.setProductCategory(productCategory);
product.setShop(shop);
product.setProductId(7L);
// 构造 商品图片
File productFile = new File("D:/o2o/1.jpg");
InputStream ins = new FileInputStream(productFile);
ImageHolder imageHolder = new ImageHolder(ins, productFile.getName());
// 构造商品详情图片
List<ImageHolder> prodImgDetailList = new ArrayList<ImageHolder>();
File productDetailFile1 = new File("D:/o2o/artisan.jpg");
InputStream ins1 = new FileInputStream(productDetailFile1);
ImageHolder imageHolder1 = new ImageHolder(ins1, productDetailFile1.getName());
File productDetailFile2 = new File("D:/o2o/TIM.jpg");
InputStream ins2 = new FileInputStream(productDetailFile2);
ImageHolder imageHolder2 = new ImageHolder(ins2, productDetailFile2.getName());
prodImgDetailList.add(imageHolder1);
prodImgDetailList.add(imageHolder2);
// 调用服务
ProductExecution pe = productService.modifyProduct(product, imageHolder, prodImgDetailList);
Assert.assertEquals(ProductStateEnum.SUCCESS.getState(), pe.getState());
}
SQL日志如下：
JDBC Connection [com.mchange.v2.c3p0.impl.NewProxyConnection@6f63b475] will be managed by Spring
==> Preparing: 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, 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 = ? ORDER BY pm.priority DESC
==> Parameters: 7(Long)
<== Columns: 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, product_img_id, img_addr, img_desc, priority, create_time
<== Row: 7, 香飘飘, test添加商品, \upload\item\shopImage\5\2018062911342810920.png, 5, 3.5, 99, 2018-06-29 11:34:28.0, 2018-06-29 11:34:28.0, 1, 36, 5, 11, \upload\item\shopImage\5\20180629113433657450.jpg, null, null, 2018-06-29 11:34:37.0
<== Row: 7, 香飘飘, test添加商品, \upload\item\shopImage\5\2018062911342810920.png, 5, 3.5, 99, 2018-06-29 11:34:28.0, 2018-06-29 11:34:28.0, 1, 36, 5, 13, \upload\item\shopImage\5\20180629113434424572.jpg, null, null, 2018-06-29 11:34:37.0
<== Row: 7, 香飘飘, test添加商品, \upload\item\shopImage\5\2018062911342810920.png, 5, 3.5, 99, 2018-06-29 11:34:28.0, 2018-06-29 11:34:28.0, 1, 36, 5, 12, \upload\item\shopImage\5\20180629113433541021.jpg, null, null, 2018-06-29 11:34:37.0
<== Total: 3
Releasing transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@64a40280]
Fetched SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@64a40280] from current transaction
==> Preparing: SELECT product_img_id, img_addr, img_desc, priority, create_time, product_id FROM tb_product_img WHERE product_id=? ORDER BY product_img_id
==> Parameters: 7(Long)
<== Columns: product_img_id, img_addr, img_desc, priority, create_time, product_id
<== Row: 11, \upload\item\shopImage\5\20180629113433657450.jpg, null, null, 2018-06-29 11:34:37.0, 7
<== Row: 12, \upload\item\shopImage\5\20180629113433541021.jpg, null, null, 2018-06-29 11:34:37.0, 7
<== Row: 13, \upload\item\shopImage\5\20180629113434424572.jpg, null, null, 2018-06-29 11:34:37.0, 7
<== Total: 3
Releasing transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@64a40280]
Fetched SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@64a40280] from current transaction
==> Preparing: DELETE FROM tb_product_img WHERE product_id = ?
==> Parameters: 7(Long)
<== Updates: 3
Releasing transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@64a40280]
Fetched SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@64a40280] from current transaction
==> Preparing: INSERT INTO tb_product_img ( img_addr, img_desc, priority, create_time, product_id ) VALUES ( ?, ?, ?, ?, ? ) , ( ?, ?, ?, ?, ? )
==> Parameters: \upload\item\shopImage\5\20180701003247930380.jpg(String), null, null, 2018-07-01 00:32:48.299(Timestamp), 7(Long), \upload\item\shopImage\5\20180701003247961681.jpg(String), null, null, 2018-07-01 00:32:48.299(Timestamp), 7(Long)
<== Updates: 2
Releasing transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@64a40280]
Fetched SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@64a40280] from current transaction
==> Preparing: UPDATE tb_product SET product_name = ?, product_desc = ?, img_addr = ?, normal_price = ?, promotion_price = ?, priority = ?, last_edit_time = ?, product_category_id = ? WHERE product_id = ? AND shop_id=?
==> Parameters: offical_product(String), product offical desc(String), \upload\item\shopImage\5\2018070100324625530.jpg(String), 100(String), 80(String), 66(Integer), 2018-07-01 00:32:45.683(Timestamp), 36(Long), 7(Long), 5(Long)
<== Updates: 1
Releasing transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@64a40280]检查数据库记录和磁盘上的文件，正确，单元测试通过。