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[PHP] 实现树形的遍历(关于多级菜单栏以及多级上下部门的查询问题)_MySQL

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  • 发表于 2017-5-12 16:11:00 | 显示全部楼层 |阅读模式
    前言:  关于多级别菜单栏或者权限系统中部门上下级的树形遍历,oracle中有connect by来实现,mysql没有这样的便捷途径,所以MySQL遍历数据表是我们经常会遇到的头痛问题,下面通过存储过程来实现。
      
      
    1,建立测试表和数据:
       DROP TABLE IF EXISTS csdn.channel; CREATE TABLE csdn.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); DROP TABLE IF EXISTS channel;
      
    2,利用临时表和递归过程实现树的遍历(mysql的UDF不能递归调用):
      
    2.1,从某节点向下遍历子节点,递归生成临时表数据
       -- pro_cre_childlist DELIMITER $$ DROP PROCEDURE IF EXISTS csdn.pro_cre_childlist$$ CREATE PROCEDURE csdn.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
       -- pro_cre_parentlist DELIMITER $$ DROP PROCEDURE IF EXISTS csdn.pro_cre_parentlist$$ CREATE PROCEDURE csdn.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
       -- pro_cre_pathlist DELIMITER $$ USE csdn$$ DROP PROCEDURE IF EXISTS pro_cre_pathlist$$ CREATE PROCEDURE pro_cre_pathlist(IN nid INT,IN delimit VARCHAR(10),INOUT pathstr VARCHAR(1000)) BEGIN DECLARE done INT DEFAULT 0; DECLARE parentid INT DEFAULT 0; DECLARE cur1 CURSOR FOR SELECT t.parent_id,CONCAT(CAST(t.parent_id AS CHAR),delimit,pathstr) FROM channel AS t WHERE t.id = nid; DECLARE CONTINUE HANDLER FOR NOT FOUND SET dOne= 1; SET max_sp_recursion_depth=12; OPEN cur1; FETCH cur1 INTO parentid,pathstr; WHILE dOne=0 DO CALL pro_cre_pathlist(parentid,delimit,pathstr); FETCH cur1 INTO parentid,pathstr; END WHILE; CLOSE cur1; END$$ DELIMITER ;   

    2.4,递归过程输出某节点name路径
       -- pro_cre_pnlist DELIMITER $$ USE csdn$$ DROP PROCEDURE IF EXISTS pro_cre_pnlist$$ CREATE PROCEDURE pro_cre_pnlist(IN nid INT,IN delimit VARCHAR(10),INOUT pathstr VARCHAR(1000)) BEGIN DECLARE done INT DEFAULT 0; DECLARE parentid INT DEFAULT 0; DECLARE cur1 CURSOR FOR SELECT t.parent_id,CONCAT(t.cname,delimit,pathstr) FROM channel AS t WHERE t.id = nid; DECLARE CONTINUE HANDLER FOR NOT FOUND SET dOne= 1; SET max_sp_recursion_depth=12; OPEN cur1; FETCH cur1 INTO parentid,pathstr; WHILE dOne=0 DO CALL pro_cre_pnlist(parentid,delimit,pathstr); FETCH cur1 INTO parentid,pathstr; END WHILE; CLOSE cur1; END$$ DELIMITER ;   

      
    2.5,调用函数输出id路径
       -- fn_tree_path DELIMITER $$ DROP FUNCTION IF EXISTS csdn.fn_tree_path$$ CREATE FUNCTION csdn.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
       -- fn_tree_pathname -- 调用函数输出name路径 DELIMITER $$ DROP FUNCTION IF EXISTS csdn.fn_tree_pathname$$ CREATE FUNCTION csdn.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$$ DELIMITER ;   

    2.7,调用过程输出子节点
       -- pro_show_childLst DELIMITER $$ -- 调用过程输出子节点 DROP PROCEDURE IF EXISTS pro_show_childLst$$ CREATE 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
       -- pro_show_parentLst DELIMITER $$ -- 调用过程输出父节点 DROP PROCEDURE IF EXISTS `pro_show_parentLst`$$ CREATE 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$$   

      
    3,开始测试:
    3.1,从根节点开始显示,显示子节点集合:
       mysql> CALL pro_show_childLst(-1); +----+-----------------------+-----------+-------+-------------+----------------------------+ | id | NAME | parent_id | depth | path | pathname | +----+-----------------------+-----------+-------+-------------+----------------------------+ | 13 | --首页 | -1 | 1 | -1/13 | 首页/ | | 16 | --左上幻灯片 | 13 | 2 | -1/13/16 | 首页/左上幻灯片/ | | 14 | --TV580 | -1 | 1 | -1/14 | TV580/ | | 17 | --帮忙 | 14 | 2 | -1/14/17 | TV580/帮忙/ | | 18 | --栏目简介 | 17 | 3 | -1/14/17/18 | TV580/帮忙/栏目简介/ | | 15 | --生活580 | -1 | 1 | -1/15 | 生活580/ | +----+-----------------------+-----------+-------+-------------+----------------------------+ 6 rows in set (0.05 sec) Query OK, 0 rows affected (0.05 sec)   

      
    3.2,显示首页下面的子节点
       CALL pro_show_childLst(13); mysql> CALL pro_show_childLst(13); +----+---------------------+-----------+-------+----------+-------------------------+ | id | NAME | parent_id | depth | path | pathname | +----+---------------------+-----------+-------+----------+-------------------------+ | 13 | --首页 | -1 | 0 | -1/13 | 首页/ | | 16 | --左上幻灯片 | 13 | 1 | -1/13/16 | 首页/左上幻灯片/ | +----+---------------------+-----------+-------+----------+-------------------------+ 2 rows in set (0.02 sec) Query OK, 0 rows affected (0.02 sec) mysql>   

    3.3,显示TV580下面的所有子节点
       CALL pro_show_childLst(14); mysql> CALL pro_show_childLst(14); +----+--------------------+-----------+-------+-------------+----------------------------+ | id | NAME | parent_id | depth | path | pathname | +----+--------------------+-----------+-------+-------------+----------------------------+ | 14 | --TV580 | -1 | 0 | -1/14 | TV580/ | | 17 | --帮忙 | 14 | 1 | -1/14/17 | TV580/帮忙/ | | 18 | --栏目简介 | 17 | 2 | -1/14/17/18 | TV580/帮忙/栏目简介/ | +----+--------------------+-----------+-------+-------------+----------------------------+ 3 rows in set (0.02 sec) Query OK, 0 rows affected (0.02 sec) mysql>   

      
    3.4,“帮忙”节点有一个子节点,显示出来:
       CALL pro_show_childLst(17); mysql> CALL pro_show_childLst(17); +----+------------------+-----------+-------+-------------+----------------------------+ | id | NAME | parent_id | depth | path | pathname | +----+------------------+-----------+-------+-------------+----------------------------+ | 17 | --帮忙 | 14 | 0 | -1/14/17 | TV580/帮忙/ | | 18 | --栏目简介 | 17 | 1 | -1/14/17/18 | TV580/帮忙/栏目简介/ | +----+------------------+-----------+-------+-------------+----------------------------+ 2 rows in set (0.03 sec) Query OK, 0 rows affected (0.03 sec) mysql>   

      
    3.5,“栏目简介”没有子节点,所以只显示最终节点:
       mysql> CALL pro_show_childLst(18); +----+----------------+-----------+-------+-------------+----------------------------+ | id | NAME | parent_id | depth | path | pathname | +----+----------------+-----------+-------+-------------+----------------------------+ | 18 | --栏目简介 | 17 | 0 | -1/14/17/18 | TV580/帮忙/栏目简介/ | +----+----------------+-----------+-------+-------------+----------------------------+ 1 row in set (0.36 sec) Query OK, 0 rows affected (0.36 sec) mysql>   

      
    3.6,显示根节点的父节点
       CALL pro_show_parentLst(-1); mysql> CALL pro_show_parentLst(-1); Empty set (0.01 sec) Query OK, 0 rows affected (0.01 sec) mysql>   

      
    3.7,显示“首页”的父节点
       CALL pro_show_parentLst(13); mysql> CALL pro_show_parentLst(13); +----+----------+-----------+-------+-------+----------+ | id | NAME | parent_id | depth | path | pathname | +----+----------+-----------+-------+-------+----------+ | 13 | --首页 | -1 | 0 | -1/13 | 首页/ | +----+----------+-----------+-------+-------+----------+ 1 row in set (0.02 sec) Query OK, 0 rows affected (0.02 sec) mysql>   

      
    3.8,显示“TV580”的父节点,parent_id为-1
       CALL pro_show_parentLst(14); mysql> CALL pro_show_parentLst(14); +----+---------+-----------+-------+-------+----------+ | id | NAME | parent_id | depth | path | pathname | +----+---------+-----------+-------+-------+----------+ | 14 | --TV580 | -1 | 0 | -1/14 | TV580/ | +----+---------+-----------+-------+-------+----------+ 1 row in set (0.02 sec) Query OK, 0 rows affected (0.02 sec)  

      
      
    3.9,显示“帮忙”节点的父节点
       mysql> CALL pro_show_parentLst(17); mysql> CALL pro_show_parentLst(17); +----+-----------+-----------+-------+----------+---------------+ | id | NAME | parent_id | depth | path | pathname | +----+-----------+-----------+-------+----------+---------------+ | 17 | --帮忙 | 14 | 0 | -1/14/17 | TV580/帮忙/ | | 14 | --TV580 | -1 | 1 | -1/14 | TV580/ | +----+-----------+-----------+-------+----------+---------------+ 2 rows in set (0.02 sec) Query OK, 0 rows affected (0.02 sec) mysql>   

      
    3.10,显示最低层节点“栏目简介”的父节点
       CALL pro_show_parentLst(18); mysql> CALL pro_show_parentLst(18); +----+----------------+-----------+-------+-------------+----------------------------+ | id | NAME | parent_id | depth | path | pathname | +----+----------------+-----------+-------+-------------+----------------------------+ | 18 | --栏目简介 | 17 | 0 | -1/14/17/18 | TV580/帮忙/栏目简介/ | | 17 | --帮忙 | 14 | 1 | -1/14/17 | TV580/帮忙/ | | 14 | --TV580 | -1 | 2 | -1/14 | TV580/ | +----+----------------+-----------+-------+-------------+----------------------------+ 3 rows in set (0.02 sec) Query OK, 0 rows affected (0.02 sec) mysql>
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