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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 '获取某人所有后代'
BEGIN
#存放结果的临时表
DROP TABLE IF EXISTS children;
CREATE TEMPORARY TABLE children SELECT 0 pLevel,p.* FROM `people` p WHERE id=parentId;
#存放中间结果的临时表
DROP TABLE IF EXISTS tem;
CREATE TEMPORARY TABLE tem SELECT id FROM `people` limit 0;
#逐级填充后代
SET @pLevel=1;
REPEAT
#清空上次数据
TRUNCATE TABLE tem;
#将当前level的后代id放入临时表
INSERT INTO tem SELECT p.id FROM `people` P, children c
WHERE p.pid=c.id AND c.pLevel=(@pLevel-1);
#将当前level的后代数据塞入结果临时表
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;
#调整表结构，删除临时列和不需要的数据
ALTER TABLE children DROP COLUMN pLevel;
DELETE FROM children WHERE id=parentId;
#返回结果
SELECT * from children;
END