CREATE TABLE `people` (

`id` INT(11) NOT NULL,

`name` VARCHAR(50) NULL DEFAULT NULL,

`pid` INT(11) NOT NULL DEFAULT '0',

PRIMARY KEY (`id`)

);

CREATE DEFINER=`root`@`%` PROCEDURE `getChildren`(IN `parentId` INT)

LANGUAGE SQL

NOT DETERMINISTIC

CONTAINS SQL

SQL SECURITY DEFINER

COMMENT '獲取某人所有后代'

BEGIN

#存放結果的臨時表

DROP TABLE IF EXISTS children;

CREATE TEMPORARY TABLE children SELECT 0 pLevel,p.* FROM `people` p WHERE id=parentId;

#存放中間結果的臨時表

DROP TABLE IF EXISTS tem;

CREATE TEMPORARY TABLE tem SELECT id FROM `people` limit 0;

#逐級填充后代

SET @pLevel=1;

REPEAT

#清空上次數據

TRUNCATE TABLE tem;

#將當前level的后代id放入臨時表

INSERT INTO tem SELECT p.id FROM `people` P, children c

WHERE p.pid=c.id AND c.pLevel=(@pLevel-1);

#將當前level的后代數據塞入結果臨時表

INSERT INTO children SELECT @pLevel pLevel,p.* FROM `people` p, tem t

WHERE p.id=t.id;

SET @pLevel=@pLevel+1;

UNTIL NOT EXISTS (SELECT * FROM tem) OR @pLevel > 10

END REPEAT;

#調整表結構，刪除臨時列和不需要的數據

ALTER TABLE children DROP COLUMN pLevel;

DELETE FROM children WHERE id=parentId;

#返回結果

SELECT * from children;

END

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