网上商城3--首页一级分类的查询

Posted 2020-08-21

1.创建表:(一级分类)

CREATE TABLE `category` (
  `cid` int(11) NOT NULL AUTO_INCREMENT,
  `cname` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`cid`)
) ENGINE=InnoDB AUTO_INCREMENT=8 DEFAULT CHARSET=utf8;
INSERT INTO `category` VALUES (‘1‘, ‘女装男装‘);
INSERT INTO `category` VALUES (‘2‘, ‘鞋靴箱包‘);
INSERT INTO `category` VALUES (‘3‘, ‘运动户外‘);
INSERT INTO `category` VALUES (‘4‘, ‘珠宝配饰‘);
INSERT INTO `category` VALUES (‘5‘, ‘手机数码‘);
INSERT INTO `category` VALUES (‘6‘, ‘家电办公‘);
INSERT INTO `category` VALUES (‘7‘, ‘护肤彩妆‘);

 

2.首页上的查询所有一级分类

IndexAction

@Override
/**
 * 访问首页的时候执行的方法:
 */
public String execute() throws Exception {
	// 查询所有一级分类
	List<Category> cList = categoryService.findAll();
	// 查询热门商品:
	List<Product> hList = productService.findByHot();
	// 查询最新商品:
	List<Product> nList = productService.findByNew();
	// 存入到值栈:
	// 获得值栈:
	ValueStack stack = ActionContext.getContext().getValueStack();
	// stack.set("cList", cList);
	ActionContext.getContext().getSession().put("cList", cList);
	stack.set("hList", hList);
	stack.set("nList", nList);
	return "index";
}