mysql存储过程实现无限分类
DROP TABLE IF EXISTS `pcms_channel`;
CREATE TABLE IF NOT EXISTS `pcms_channel` (
`cid` tinyint(3) unsigned NOT NULL auto_increment,
`name` char(10) NOT NULL COMMENT '频道名称',
`parentid` tinyint(4) NOT NULL COMMENT '父级ID',
`lft` tinyint(4) NOT NULL COMMENT '左值',
`rgt` tinyint(4) NOT NULL COMMENT '右值',
`lv` tinyint(3) unsigned NOT NULL default '0' COMMENT '级层',
`themeid` tinyint(3) unsigned NOT NULL default '1' COMMENT '使用的主题的ID',
PRIMARY KEY (`cid`),
KEY `parentid` (`parentid`,`lft`,`rgt`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=7 ;
--
-- 导出表中的数据 `pcms_channel`
--
INSERT INTO `pcms_channel` (`cid`, `name`, `parentid`, `lft`, `rgt`, `lv`, `themeid`) VALUES
(1, 'phpoocms', 0, 1, 12, 0, 1),
(2, 'test', 1, 2, 7, 1, 1),
(3, 'te', 2, 3, 6, 2, 1),
(4, 'tes', 1, 8, 9, 1, 1),
(5, 'dd', 3, 4, 5, 3, 1),
(6, 'fromphp', 1, 10, 11, 1, 1);
复制代码清空表记录 TRUNCATE TABLE `pcms_channel`
复制代码添加节点到指定节点 DROP PROCEDURE IF EXISTS addChannel//
create procedure addChannel (in pid int,in name varchar(20))
BEGIN
DECLARE pr INT;/*右值*/
DECLARE lvv INT;/*层级*/
DECLARE aff INT;/*计数器*/
DECLARE af INT DEFAULT 0;
SET @result = null;
SELECT `rgt`,`lv` INTO pr,lvv FROM `pcms_channel` WHERE `cid` = pid;
IF pr THEN
START TRANSACTION;
UPDATE `pcms_channel` SET `lft`=`lft`+2 WHERE `lft`>pr;
SELECT ROW_COUNT() INTO aff;
SET af = aff+af;
UPDATE `pcms_channel` SET `rgt`=`rgt`+2 WHERE `rgt`>=pr;
SELECT ROW_COUNT() INTO aff;
SET af = aff+af;
INSERT INTO `pcms_channel` (`name`,`parentid`,`lft`,`rgt`,`lv`) VALUES (name,pid,pr,pr+1,lvv+1);
SELECT ROW_COUNT() INTO aff;
SET af = aff+af;
IF af >= 2 THEN
COMMIT;
SET @result = 1000;
SELECT 1000 AS result;
ELSE
ROLLBACK;
SET @result = 1002;
SELECT 1002 AS result;
END IF;
ELSE
SET @result = 1001;
SELECT 1001 AS result;
END IF;
END//
call addChannel (5,"aa")//
复制代码删除指定节点 DROP PROCEDURE IF EXISTS delChannel//
create procedure delChannel (in pid int)
BEGIN
DECLARE pl INT;
DECLARE pn INT;
DECLARE aff INT;
DECLARE af INT DEFAULT 0;
SET @result = null;
SET @parentid = null;
SET @name = null;
SELECT a.`lft`,IFNULL(COUNT(b.`cid`),0),a.`parentid`,a.`name` INTO pl,pn,@parentid,@name FROM `pcms_channel` AS a LEFT JOIN `pcms_channel` AS b ON a.`cid`=b.`parentid` WHERE a.`cid`=pid GROUP BY b.`parentid`;
IF pl&&!pn THEN
IF pl!=1 THEN
START TRANSACTION;
UPDATE `pcms_channel` SET `lft`=`lft`-2 WHERE `lft`>pl;
SELECT ROW_COUNT() INTO aff;
SET af = aff+af;
UPDATE `pcms_channel` SET `rgt`=`rgt`-2 WHERE `rgt`>pl;
SELECT ROW_COUNT() INTO aff;
SET af = aff+af;
DELETE FROM `pcms_channel` WHERE `cid` = pid;
SELECT ROW_COUNT() INTO aff;
SET af = aff+af;
IF af >= 2 THEN
COMMIT;
SET @result = 1000;
SELECT 1000 AS result;
ELSE
ROLLBACK;
SET @result = 1002;
SELECT 1002 AS result;
END IF;
ELSE
SET @result = 1004;
SELECT 1004 AS result;
END IF;
ELSEIF pn&&pl THEN
SET @result = 1003;
SELECT 1003 AS result;
ELSE
SET @result = 1001;
SELECT 1001 AS result;
END IF;
END//
call delChannel (1)//
复制代码移动节点 DROP PROCEDURE IF EXISTS moveChannel//
create procedure moveChannel (pid int,tid int)
BEGIN
IF pid=1 THEN
SELECT 1004 AS result;
ELSE
IF pid!=tid THEN
call delChannel (pid);
IF @result=1000 THEN
call addChannel (tid,@name);
IF @result THEN
SELECT 1000 AS result;
ELSE
call addChannel (@parentid,@name);
SELECT @result AS result;
END IF;
ELSE
SELECT @result AS result;
END IF;
ELSE
SELECT 1005 AS result;
END IF;
END IF;
SET @result=null;
SET @parentid=null;
SET @name=null;
END//
call moveChannel (1,1)//
复制代码查询出树状结构 select cid,concat(repeat(" ",lv)) from pcms_channel
补充：数据库,mysql教程
