java网上图书商城（2）Category模块

本文实例为大家分享了java网上图书商城Category模块代码，供大家参考，具体内容如下

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 findAll() throws SQLException {
 
 String sql = "select * from t_category where pid is null order by orderBy";
 List> mapList = qr.query(sql, new MapListHandler());
  
 List parents = toCategoryList(mapList);
  
 
 for(Category parent : parents) {
  // 查询出当前父分类的所有子分类
  List children = findByParent(parent.getCid());
  // 设置给父分类
  parent.setChildren(children);
 }
 return parents;
}

left.jsp

Q6MenuBar组件显示手风琴式下拉菜单

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。