MySql根据ID查询树结构所有父/子节点

1）新建表结构

CREATE TABLE `monitor_menu` (
  `id` varchar(45) NOT NULL DEFAULT '0' COMMENT '主键ID',
  `menu_name` varchar(45) DEFAULT NULL COMMENT '名称',
  `parent_id` varchar(45) DEFAULT NULL COMMENT '父级ID',
  PRIMARY KEY (`id`) USING BTREE
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='树结构数据表';

2）添加测试数据

INSERT INTO `jsbz`.`monitor_menu`(`id`, `menu_name`, `parent_id`) VALUES ('1001', '一级目录', '0');
INSERT INTO `jsbz`.`monitor_menu`(`id`, `menu_name`, `parent_id`) VALUES ('1002', '二级目录1', '1001');
INSERT INTO `jsbz`.`monitor_menu`(`id`, `menu_name`, `parent_id`) VALUES ('1003', '二级目录2', '1001');
INSERT INTO `jsbz`.`monitor_menu`(`id`, `menu_name`, `parent_id`) VALUES ('1004', '二级目录3', '1001');
INSERT INTO `jsbz`.`monitor_menu`(`id`, `menu_name`, `parent_id`) VALUES ('1005', '三级目录1', '1002');
INSERT INTO `jsbz`.`monitor_menu`(`id`, `menu_name`, `parent_id`) VALUES ('1006', '三级目录2', '1003');
INSERT INTO `jsbz`.`monitor_menu`(`id`, `menu_name`, `parent_id`) VALUES ('1007', '三级目录3', '1004');

3）根据指定ID查询所有父节点数据

monitor_menu：树结构表

1005：指定查询ID

SELECT
    T2.* 
FROM
    (
    SELECT
        @r AS _id,
        ( SELECT @r := parent_id FROM monitor_menu WHERE id = _id ) AS parent_id,
        @l := @l + 1 AS lvl 
    FROM
        ( SELECT @r := '1005', @l := 0 ) vars,
        monitor_menu h 
    WHERE
        @r <> 0 
    ) T1
    JOIN monitor_menu T2 ON T1._id = T2.id 
ORDER BY
    T1.lvl DESC

返回结果如下：

MySql根据ID查询树结构所有父/子节点

4）根据指定ID查询所有子节点数据

monitor_menu：树结构表

1001：指定查询ID

创建一个存储过程

DROP FUNCTION IF EXISTS `getChildrenList`;
CREATE FUNCTION `getChildrenList` (rootId VARCHAR ( 1000 )) 
RETURNS VARCHAR ( 1000 ) 
BEGIN
    DECLARE
        sTemp VARCHAR ( 1000 );
    DECLARE
        sTempChd VARCHAR ( 1000 );
    
    SET sTemp = '$';
    SET sTempChd = cast( rootId AS CHAR );
    
    WHILE sTempChd IS NOT NULL DO
        SET sTemp = concat( sTemp, ',', sTempChd );
        SELECT
            group_concat( id ) INTO sTempChd 
        FROM
            monitor_menu 
        WHERE
            FIND_IN_SET( parent_id, sTempChd )> 0;
    END WHILE;
    RETURN sTemp;
END

执行SQL查询：

select * from monitor_menu where FIND_IN_SET(id,getChildrenList('1001'))

返回结果如下：

MySql根据ID查询树结构所有父/子节点