Mysql 层级无限嵌套

1.新建测试数据

新建channel表

DROP TABLE IF EXISTS channel;
CREATE TABLE channel (
  id INT(11) NOT NULL AUTO_INCREMENT,
  cname VARCHAR(200) DEFAULT NULL,
  parent_id INT(11) DEFAULT NULL,
  PRIMARY KEY (id)
) ENGINE=INNODB DEFAULT CHARSET=utf8;
INSERT  INTO channel(id,cname,parent_id)
VALUES (13,'首页',-1),
       (14,'TV580',-1),
       (15,'生活580',-1),
       (16,'左上幻灯片',13),
       (17,'帮忙',14),
       (18,'栏目简介',17);

2.1 从某节点向下遍历子节点，递归生成临时表数据

向下遍历子节点

CREATE DEFINER=`root`@`localhost` PROCEDURE `pro_cre_childlist`(IN rootId INT,IN nDepth INT)
BEGIN
      DECLARE done INT DEFAULT 0;
      DECLARE b INT;
      DECLARE cur1 CURSOR FOR SELECT id FROM channel WHERE parent_id=rootId;
      DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;
      SET max_sp_recursion_depth=12;   

      INSERT INTO tmpLst VALUES (NULL,rootId,nDepth);   

      OPEN cur1;   

      FETCH cur1 INTO b;
      WHILE done=0 DO
              CALL pro_cre_childlist(b,nDepth+1);
              FETCH cur1 INTO b;
      END WHILE;   

      CLOSE cur1;
END

2.2 从某节点向上追溯根节点，递归生成临时表数据

点击查看代码

CREATE DEFINER=`root`@`localhost` PROCEDURE `pro_cre_parentlist`(IN rootId INT,IN nDepth INT)
BEGIN
      DECLARE done INT DEFAULT 0;
      DECLARE b INT;
      DECLARE cur1 CURSOR FOR SELECT parent_id FROM channel WHERE id=rootId;
      DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;
      SET max_sp_recursion_depth=12;   

      INSERT INTO tmpLst VALUES (NULL,rootId,nDepth);   

      OPEN cur1;   

      FETCH cur1 INTO b;
      WHILE done=0 DO
              CALL pro_cre_parentlist(b,nDepth+1);
              FETCH cur1 INTO b;
      END WHILE;   

      CLOSE cur1;
END

2.3 实现类似Oracle SYS_CONNECT_BY_PATH的功能，递归过程输出某节点id路径

点击查看代码

CREATE DEFINER=`root`@`localhost` PROCEDURE `pro_cre_pathlist`(IN nid INT,IN delimit VARCHAR(10),INOUT pathstr VARCHAR(1000))
BEGIN
      DECLARE done INT DEFAULT 0;
      DECLARE parentid INT DEFAULT 0;
      DECLARE cur1 CURSOR FOR
      SELECT t.parent_id,CONCAT(CAST(t.parent_id AS CHAR),delimit,pathstr)
        FROM channel AS t WHERE t.id = nid;   

      DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;
      SET max_sp_recursion_depth=12;                     

      OPEN cur1;   

      FETCH cur1 INTO parentid,pathstr;
      WHILE done=0 DO
              CALL pro_cre_pathlist(parentid,delimit,pathstr);
              FETCH cur1 INTO parentid,pathstr;
      END WHILE;   

      CLOSE cur1;
END

2.4 递归过程输出某节点name路径

点击查看代码

CREATE DEFINER=`root`@`localhost` PROCEDURE `pro_cre_pnlist`(IN nid INT,IN delimit VARCHAR(10),INOUT pathstr VARCHAR(1000))
BEGIN
      DECLARE done INT DEFAULT 0;
      DECLARE parentid INT DEFAULT 0;
      DECLARE cur1 CURSOR FOR
      SELECT t.parent_id,CONCAT(t.cname,delimit,pathstr)
        FROM channel AS t WHERE t.id = nid;   

      DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;
      SET max_sp_recursion_depth=12;                     

      OPEN cur1;   

      FETCH cur1 INTO parentid,pathstr;
      WHILE done=0 DO
              CALL pro_cre_pnlist(parentid,delimit,pathstr);
              FETCH cur1 INTO parentid,pathstr;
      END WHILE;   

      CLOSE cur1;
END

2.5 调用函数输出id路径

点击查看代码

CREATE DEFINER=`root`@`localhost` FUNCTION `fn_tree_path`(nid INT,delimit VARCHAR(10)) RETURNS varchar(2000) CHARSET utf8
BEGIN
  DECLARE pathid VARCHAR(1000);   

  SET @pathid=CAST(nid AS CHAR);
  CALL pro_cre_pathlist(nid,delimit,@pathid);   

  RETURN @pathid;
END

2.6 调用函数输出name路径

点击查看代码

CREATE DEFINER=`root`@`localhost` FUNCTION `fn_tree_pathname`(nid INT,delimit VARCHAR(10)) RETURNS varchar(2000) CHARSET utf8
BEGIN
  DECLARE pathid VARCHAR(1000);
  SET @pathid='';
  CALL pro_cre_pnlist(nid,delimit,@pathid);
  RETURN @pathid;
END

2.7 调用过程输出子节点

点击查看代码

CREATE DEFINER=`root`@`localhost` PROCEDURE `pro_show_childLst`(IN rootId INT)
BEGIN
      DROP TEMPORARY TABLE IF EXISTS tmpLst;
      CREATE TEMPORARY TABLE IF NOT EXISTS tmpLst
       (sno INT PRIMARY KEY AUTO_INCREMENT,id INT,depth INT);         

      CALL pro_cre_childlist(rootId,0);   

      SELECT channel.id
	   , CONCAT(SPACE(tmpLst.depth*2),'--',channel.cname) NAME
	   , channel.parent_id
	   , tmpLst.depth
	   , fn_tree_path(channel.id,'/') path
	   , fn_tree_pathname(channel.id,'/') pathname
      FROM tmpLst,channel WHERE tmpLst.id=channel.id ORDER BY tmpLst.sno;
END

2.8 调用过程输出父节点

点击查看代码

CREATE DEFINER=`root`@`localhost` PROCEDURE `pro_show_parentLst`(IN rootId INT)
BEGIN
      DROP TEMPORARY TABLE IF EXISTS tmpLst;
      CREATE TEMPORARY TABLE IF NOT EXISTS tmpLst
       (sno INT PRIMARY KEY AUTO_INCREMENT,id INT,depth INT);         

      CALL pro_cre_parentlist(rootId,0);
      SELECT channel.id
            ,CONCAT(SPACE(tmpLst.depth*2),'--',channel.cname) NAME
            ,channel.parent_id,tmpLst.depth,fn_tree_path(channel.id,'/') path
            ,fn_tree_pathname(channel.id,'/') pathname
      FROM tmpLst,channel
      WHERE tmpLst.id=channel.id
      ORDER BY tmpLst.sno;
END