CREATE TABLE `tab_menu` (
  `MU_ID` int(10) NOT NULL AUTO_INCREMENT COMMENT ‘主鍵‘,
  `MU_NAME` varchar(255) NOT NULL COMMENT ‘菜單名‘,
  `MU_CODE` varchar(100) DEFAULT NULL COMMENT ‘菜單編碼‘,
  `MU_CHAIN_NAME` varchar(255) NOT NULL COMMENT ‘菜單全名‘,
  `MU_PARENT_ID` int(10) NOT NULL COMMENT ‘上級菜單ID‘,
  `MU_URL` 
 
varchar(255) NOT NULL COMMENT ‘菜單URL‘,
  `STATUS` smallint(1) NOT NULL DEFAULT ‘1‘ COMMENT ‘狀態;0：未啟用 1:已啟用,默認為1‘,
  `MU_ELEMENT_TYPE` varchar(40) NOT NULL COMMENT ‘所屬元素類型‘,
  `MU_SCOPE` varchar(20) NOT NULL DEFAULT ‘common‘ COMMENT ‘菜單作用範圍;‘,
  `CREATE_USER_ID` int(11) NOT NULL COMMENT ‘創建用戶ID‘,
  `CREATE_TIME` 
 
datetime NOT NULL COMMENT ‘創建時間‘,
  `UPDATE_USER_ID` int(11) DEFAULT NULL COMMENT ‘修改用戶ID‘,
  `UPDATE_TIME` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT ‘修改時間‘,
  `VERSION_NUMBER` int(11) NOT NULL DEFAULT ‘0‘ COMMENT ‘版本號:新增資料為 0，每次修改加 1‘,
  PRIMARY KEY (`MU_ID`),
  
 
KEY `idx_menu_url` (`MU_URL`)
) ENGINE=InnoDB AUTO_INCREMENT=2040101 DEFAULT CHARSET=utf8 COMMENT=‘菜單‘;

CREATE DEFINER=`ggs`@`%` FUNCTION `pkg_pm_fun_get_children_branch`(menu_id int(10)) RETURNS text CHARSET utf8 COLLATE utf8_bin
begin
    declare menu_ids TEXT;
    declare tmp_menu_ids text;
    set tmp_menu_ids =‘$‘;
    set menu_ids = cast(menu_id as char);
    while menu_ids is not null do
        set tmp_menu_ids = concat(tmp_menu_ids,‘,‘,menu_ids);
        select group_concat(mu_id) into menu_ids from tab_menu where find_in_set(mu_parent_id,menu_ids) > 0;
    end while;
    return tmp_menu_ids;
end

找到父節點下的所有子節點（包括子節點）