mysql存儲過程實現無限分類

mysql存儲過程實現無限分類

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 '頻道名稱',

  `parentid` tinyint(4) NOT NULL COMMENT '父級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 '級層',

  `themeid` tinyint(3) unsigned NOT NULL default '1' COMMENT '使用的主題的ID',

  PRIMARY KEY  (`cid`),

  KEY `parentid` (`parentid`,`lft`,`rgt`)

) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=7 ;

--

-- 導出表中的數據 `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);
復制代碼清空表記錄 TRUNCATE TABLE `pcms_channel`
復制代碼添加節點到指定節點 DROP PROCEDURE IF EXISTS addChannel//

create procedure addChannel (in pid int,in name varchar(20))

BEGIN

DECLARE pr INT;/*右值*/

DECLARE lvv INT;/*層級*/

DECLARE aff INT;/*計數器*/

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")//
復制代碼刪除指定節點 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)//
復制代碼移動節點 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)//
復制代碼查詢出樹狀結構 select cid,concat(repeat("　",lv)) from pcms_channel