網上圖書商城2--Category模塊，商城2--category

網上圖書商城2--Category模塊，商城2--category

sql

CREATE TABLE `t_category` (
  `cid` char(32) NOT NULL,
  `cname` varchar(50) DEFAULT NULL,
  `pid` char(32) DEFAULT NULL,
  `desc` varchar(100) DEFAULT NULL,
  `orderBy` int(11) NOT NULL AUTO_INCREMENT,
  PRIMARY KEY (`cid`),
  UNIQUE KEY `cname` (`cname`),
  KEY `FK_t_category_t_category` (`pid`),
  KEY `orderBy` (`orderBy`),
  CONSTRAINT `FK_t_category_t_category` FOREIGN KEY (`pid`) REFERENCES `t_category` (`cid`)
) ENGINE=InnoDB AUTO_INCREMENT=48 DEFAULT CHARSET=utf8;

Dao

public List<Category> findAll() throws SQLException {
	/*
	 * 1. 查詢出所有一級分類
	 */
	String sql = "select * from t_category where pid is null order by orderBy";
	List<Map<String,Object>> mapList = qr.query(sql, new MapListHandler());
	
	List<Category> parents = toCategoryList(mapList);
	
	/*
	 * 2. 循環遍歷所有的一級分類，為每個一級分類加載它的二級分類 
	 */
	for(Category parent : parents) {
		// 查詢出當前父分類的所有子分類
		List<Category> children = findByParent(parent.getCid());
		// 設置給父分類
		parent.setChildren(children);
	}
	return parents;
}

left.jsp

Q6MenuBar組件顯示手風琴式下拉菜單

<script language="javascript">
$(function() {
....
<c:forEach items="${parents}" var="parent">
  <c:forEach items="${parent.children}" var="child">
	bar.add("${parent.cname}", "${child.cname}", "/goods/BookServlet?method=findByCategory&cid=${child.cid}", "body");
  </c:forEach>
</c:forEach>

});
</script>