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最近在工作当中,遇见了有ztree关系的查询:
比如:根据父级的部门ID查询所有的子级部门;
根据父级的区划代码查询所属下级的所有区划信息;
根据子级ID查询隶属行政区划信息;
根据组织机构ID查询所有子级组织机构;
数据准备
为了测试,我们首先来创建一张拥有上下级关系的表,这里选择创建一张区划信息表
DROP TABLE IF EXISTS `tb_area`; CREATE TABLE `tb_area` ( `area_id` int(10) unsigned NOT NULL AUTO_INCREMENT, `area_name` varchar(255) DEFAULT NULL, `area_code` varchar(255) DEFAULT NULL, `pid` int(10) DEFAULT NULL, PRIMARY KEY (`area_id`) ) ENGINE=InnoDB AUTO_INCREMENT=131 DEFAULT CHARSET=utf8;
准备数据:
这里给了一些测试数据,如果需要可以参考:
可以测试数据:
INSERT INTO `tb_area` VALUES (‘1‘, ‘中国‘, ‘100000‘, ‘0‘);
INSERT INTO `tb_area` VALUES (‘2‘, ‘广西壮族自治区‘, ‘450000000000‘, ‘1‘);
INSERT INTO `tb_area` VALUES (‘3‘, ‘防城港市‘, ‘450600000000‘, ‘2‘);
INSERT INTO `tb_area` VALUES (‘4‘, ‘港口区‘, ‘450602000000‘, ‘3‘);
INSERT INTO `tb_area` VALUES (‘5‘, ‘防城区‘, ‘450603000000‘, ‘3‘);
INSERT INTO `tb_area` VALUES (‘6‘, ‘上思县‘, ‘450621000000‘, ‘3‘);
INSERT INTO `tb_area` VALUES (‘7‘, ‘东兴市‘, ‘450681000000‘, ‘3‘);
INSERT INTO `tb_area` VALUES (‘8‘, ‘渔州坪街道‘, ‘450602001000‘, ‘4‘);
INSERT INTO `tb_area` VALUES (‘9‘, ‘白沙叶街道‘, ‘450602002000‘, ‘4‘);
INSERT INTO `tb_area` VALUES (‘10‘, ‘沙潭江街道‘, ‘450602003000‘, ‘4‘);
INSERT INTO `tb_area` VALUES (‘11‘, ‘王府街道‘, ‘450602004000‘, ‘4‘);
INSERT INTO `tb_area` VALUES (‘12‘, ‘企沙镇‘, ‘450602100000‘, ‘4‘);
INSERT INTO `tb_area` VALUES (‘13‘, ‘光坡镇‘, ‘450602101000‘, ‘4‘);
INSERT INTO `tb_area` VALUES (‘14‘, ‘水营街道‘, ‘450603001000‘, ‘5‘);
INSERT INTO `tb_area` VALUES (‘15‘, ‘珠河街道‘, ‘450603002000‘, ‘5‘);
INSERT INTO `tb_area` VALUES (‘109‘, ‘文昌街道‘, ‘450603003000‘, ‘5‘);
INSERT INTO `tb_area` VALUES (‘110‘, ‘大菉镇‘, ‘450603101000‘, ‘5‘);
INSERT INTO `tb_area` VALUES (‘111‘, ‘华石镇‘, ‘450603102000‘, ‘5‘);
INSERT INTO `tb_area` VALUES (‘112‘, ‘那梭镇‘, ‘450603103000‘, ‘5‘);
INSERT INTO `tb_area` VALUES (‘113‘, ‘那良镇‘, ‘450603104000‘, ‘5‘);
INSERT INTO `tb_area` VALUES (‘114‘, ‘峒中镇‘, ‘450603105000‘, ‘5‘);
INSERT INTO `tb_area` VALUES (‘115‘, ‘茅岭镇‘, ‘450603106000‘, ‘5‘);
INSERT INTO `tb_area` VALUES (‘116‘, ‘江山镇‘, ‘450603107000‘, ‘5‘);
INSERT INTO `tb_area` VALUES (‘117‘, ‘扶隆镇‘, ‘450603108000‘, ‘5‘);
INSERT INTO `tb_area` VALUES (‘118‘, ‘滩营乡‘, ‘450603204000‘, ‘5‘);
INSERT INTO `tb_area` VALUES (‘119‘, ‘十万山瑶族乡‘, ‘450603209000‘, ‘5‘);
INSERT INTO `tb_area` VALUES (‘120‘, ‘思阳镇‘, ‘450621100000‘, ‘6‘);
INSERT INTO `tb_area` VALUES (‘121‘, ‘在妙镇‘, ‘450621101000‘, ‘6‘);
INSERT INTO `tb_area` VALUES (‘122‘, ‘华兰镇‘, ‘450621102000‘, ‘6‘);
INSERT INTO `tb_area` VALUES (‘123‘, ‘叫安镇‘, ‘450621103000‘, ‘6‘);
INSERT INTO `tb_area` VALUES (‘124‘, ‘南屏瑶族乡‘, ‘450621203000‘, ‘6‘);
INSERT INTO `tb_area` VALUES (‘125‘, ‘平福乡‘, ‘450621204000‘, ‘6‘);
INSERT INTO `tb_area` VALUES (‘126‘, ‘那琴乡‘, ‘450621206000‘, ‘6‘);
INSERT INTO `tb_area` VALUES (‘127‘, ‘公正乡‘, ‘450621208000‘, ‘6‘);
INSERT INTO `tb_area` VALUES (‘128‘, ‘东兴镇‘, ‘450681100000‘, ‘7‘);
INSERT INTO `tb_area` VALUES (‘129‘, ‘江平镇‘, ‘450681101000‘, ‘7‘);
INSERT INTO `tb_area` VALUES (‘130‘, ‘马路镇‘, ‘450681102000‘, ‘7‘);
代码编写
首先我们来写自下而上的查询:
也就是根据下级区划代码ID查询隶属行政区
创建一个函数:
DROP FUNCTION IF EXISTS getAreaChildBottomUp; CREATE FUNCTION getAreaChildBottomUp(areaId INT) RETURNS VARCHAR(4000) BEGIN DECLARE sTemp VARCHAR(4000); DECLARE sTempChd VARCHAR(4000); SET sTemp=‘$‘; SET sTempChd = CAST(areaId AS CHAR); SET sTemp = CONCAT(sTemp,‘,‘,sTempChd); SELECT pid INTO sTempChd FROM tb_area WHERE area_id = sTempChd; WHILE sTempChd <> 0 DO SET sTemp = CONCAT(sTemp,‘,‘,sTempChd); SELECT pid INTO sTempChd FROM tb_area WHERE area_id = sTempChd; END WHILE; RETURN sTemp; END;
查询方法:
SELECT * FROM tb_area WHERE FIND_IN_SET( area_id, getAreaChildBottomUp (113) );
显示结果:
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也可以直接使用SQL语句:
SELECT area_id, area_name, area_code, pid FROM ( SELECT @r AS _id, ( SELECT @r := pid FROM tb_area WHERE area_id = _id ) AS parent_id, @l := @l + 1 AS lvl FROM (SELECT @r := 113, @l := 0) vars, tb_area h WHERE @r <> 0 ) T1 JOIN tb_area T2 ON T1._id = T2.area_id ORDER BY area_id;
查出效果相同:
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下来写自上而下的查询:
也就是根据上级区划代码ID查询隶属下级行政区
创建一个函数:
DROP FUNCTION IF EXISTS queryChildFromTopToBottom; CREATE FUNCTION queryChildFromTopToBottom(areaId INT) RETURNS VARCHAR(4000) BEGIN DECLARE sTemp VARCHAR(4000); DECLARE sTempChd VARCHAR(4000); SET sTemp=‘$‘; SET sTempChd = CAST(areaId AS CHAR); WHILE sTempChd IS NOT NULL DO SET sTemp= CONCAT(sTemp,‘,‘,sTempChd); SELECT GROUP_CONCAT(area_id) INTO sTempChd FROM tb_area WHERE FIND_IN_SET(pid,sTempChd)>0; END WHILE; RETURN sTemp; END;
查询方法:
SELECT * FROM tb_area WHERE FIND_IN_SET( area_id, queryChildFromTopToBottom (4) );
查询结果:
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原文地址:https://www.cnblogs.com/zhaixingzhu/p/12569272.html
时间: 2024-10-29 22:01:56