MySQL中落实递归查询【欧洲杯竞猜平台】

对于数据库中的树形布局数据,如部门表,有时候,我们要求精通某机关的有所下属部分或然某有些的有着上级部门,这时就须求动用mysql的递归查询

1、创建表

DROP TABLE IF EXISTS `t_areainfo`;CREATE TABLE `t_areainfo` ( `id` int(11) NOT '0' AUTO_INCREMENT, `level` int(11) DEFAULT '0', `name` varchar(255) DEFAULT '0', `parentId` int(11) DEFAULT '0', `status` int(11) DEFAULT '0', PRIMARY KEY (`id`)) ENGINE=InnoDB AUTO_INCREMENT=65 DEFAULT CHARSET=utf8;

2、最初数据

INSERT INTO `t_areainfo` VALUES ('1', '0', '中国', '0', '0');INSERT INTO `t_areainfo` VALUES ('2', '0', '华北区', '1', '0');INSERT INTO `t_areainfo` VALUES ('3', '0', '华南区', '1', '0');INSERT INTO `t_areainfo` VALUES ('4', '0', '北京', '2', '0');INSERT INTO `t_areainfo` VALUES ('5', '0', '海淀区', '4', '0');INSERT INTO `t_areainfo` VALUES ('6', '0', '丰台区', '4', '0');INSERT INTO `t_areainfo` VALUES ('7', '0', '朝阳区', '4', '0');INSERT INTO `t_areainfo` VALUES ('8', '0', '北京XX区1', '4', '0');INSERT INTO `t_areainfo` VALUES ('9', '0', '北京XX区2', '4', '0');INSERT INTO `t_areainfo` VALUES ('10', '0', '北京XX区3', '4', '0');INSERT INTO `t_areainfo` VALUES ('11', '0', '北京XX区4', '4', '0');INSERT INTO `t_areainfo` VALUES ('12', '0', '北京XX区5', '4', '0');INSERT INTO `t_areainfo` VALUES ('13', '0', '北京XX区6', '4', '0');INSERT INTO `t_areainfo` VALUES ('14', '0', '北京XX区7', '4', '0');INSERT INTO `t_areainfo` VALUES ('15', '0', '北京XX区8', '4', '0');INSERT INTO `t_areainfo` VALUES ('16', '0', '北京XX区9', '4', '0');INSERT INTO `t_areainfo` VALUES ('17', '0', '北京XX区10', '4', '0');INSERT INTO `t_areainfo` VALUES ('18', '0', '北京XX区11', '4', '0');INSERT INTO `t_areainfo` VALUES ('19', '0', '北京XX区12', '4', '0');INSERT INTO `t_areainfo` VALUES ('20', '0', '北京XX区13', '4', '0');INSERT INTO `t_areainfo` VALUES ('21', '0', '北京XX区14', '4', '0');INSERT INTO `t_areainfo` VALUES ('22', '0', '北京XX区15', '4', '0');INSERT INTO `t_areainfo` VALUES ('23', '0', '北京XX区16', '4', '0');INSERT INTO `t_areainfo` VALUES ('24', '0', '北京XX区17', '4', '0');INSERT INTO `t_areainfo` VALUES ('25', '0', '北京XX区18', '4', '0');INSERT INTO `t_areainfo` VALUES ('26', '0', '北京XX区19', '4', '0');INSERT INTO `t_areainfo` VALUES ('27', '0', '北京XX区1', '4', '0');INSERT INTO `t_areainfo` VALUES ('28', '0', '北京XX区2', '4', '0');INSERT INTO `t_areainfo` VALUES ('29', '0', '北京XX区3', '4', '0');INSERT INTO `t_areainfo` VALUES ('30', '0', '北京XX区4', '4', '0');INSERT INTO `t_areainfo` VALUES ('31', '0', '北京XX区5', '4', '0');INSERT INTO `t_areainfo` VALUES ('32', '0', '北京XX区6', '4', '0');INSERT INTO `t_areainfo` VALUES ('33', '0', '北京XX区7', '4', '0');INSERT INTO `t_areainfo` VALUES ('34', '0', '北京XX区8', '4', '0');INSERT INTO `t_areainfo` VALUES ('35', '0', '北京XX区9', '4', '0');INSERT INTO `t_areainfo` VALUES ('36', '0', '北京XX区10', '4', '0');INSERT INTO `t_areainfo` VALUES ('37', '0', '北京XX区11', '4', '0');INSERT INTO `t_areainfo` VALUES ('38', '0', '北京XX区12', '4', '0');INSERT INTO `t_areainfo` VALUES ('39', '0', '北京XX区13', '4', '0');INSERT INTO `t_areainfo` VALUES ('40', '0', '北京XX区14', '4', '0');INSERT INTO `t_areainfo` VALUES ('41', '0', '北京XX区15', '4', '0');INSERT INTO `t_areainfo` VALUES ('42', '0', '北京XX区16', '4', '0');INSERT INTO `t_areainfo` VALUES ('43', '0', '北京XX区17', '4', '0');INSERT INTO `t_areainfo` VALUES ('44', '0', '北京XX区18', '4', '0');INSERT INTO `t_areainfo` VALUES ('45', '0', '北京XX区19', '4', '0');INSERT INTO `t_areainfo` VALUES ('46', '0', 'xx省1', '1', '0');INSERT INTO `t_areainfo` VALUES ('47', '0', 'xx省2', '1', '0');INSERT INTO `t_areainfo` VALUES ('48', '0', 'xx省3', '1', '0');INSERT INTO `t_areainfo` VALUES ('49', '0', 'xx省4', '1', '0');INSERT INTO `t_areainfo` VALUES ('50', '0', 'xx省5', '1', '0');INSERT INTO `t_areainfo` VALUES ('51', '0', 'xx省6', '1', '0');INSERT INTO `t_areainfo` VALUES ('52', '0', 'xx省7', '1', '0');INSERT INTO `t_areainfo` VALUES ('53', '0', 'xx省8', '1', '0');INSERT INTO `t_areainfo` VALUES ('54', '0', 'xx省9', '1', '0');INSERT INTO `t_areainfo` VALUES ('55', '0', 'xx省10', '1', '0');INSERT INTO `t_areainfo` VALUES ('56', '0', 'xx省11', '1', '0');INSERT INTO `t_areainfo` VALUES ('57', '0', 'xx省12', '1', '0');INSERT INTO `t_areainfo` VALUES ('58', '0', 'xx省13', '1', '0');INSERT INTO `t_areainfo` VALUES ('59', '0', 'xx省14', '1', '0');INSERT INTO `t_areainfo` VALUES ('60', '0', 'xx省15', '1', '0');INSERT INTO `t_areainfo` VALUES ('61', '0', 'xx省16', '1', '0');INSERT INTO `t_areainfo` VALUES ('62', '0', 'xx省17', '1', '0');INSERT INTO `t_areainfo` VALUES ('63', '0', 'xx省18', '1', '0');INSERT INTO `t_areainfo` VALUES ('64', '0', 'xx省19', '1', '0');

3、向下递归

利用find_in_set()函数和group_concat(卡塔尔国函数实现递归查询:

DROP FUNCTION IF EXISTS queryChildrenAreaInfo;CREATE FUNCTION queryChildrenAreaInfo(areaId INT)RETURNS VARCHAR(4000)BEGINDECLARE sTemp VARCHAR(4000);DECLARE sTempChd VARCHAR(4000);SET sTemp='$';SET sTempChd = CAST(areaId AS CHAR);WHILE sTempChd IS NOT NULL DOSET sTemp= CONCAT(sTemp,',',sTempChd);SELECT GROUP_CONCAT(id) INTO sTempChd FROM t_areainfo WHERE FIND_IN_SET(parentId,sTempChd)>0;END WHILE;RETURN sTemp;END;

4、调用方式

SELECT queryChildrenAreaInfo(1);

欧洲杯竞猜平台 1

询问id为”4″上面包车型客车兼具节点

SELECT * FROM t_areainfo WHERE FIND_IN_SET(id,queryChildrenAreaInfo(4));

欧洲杯竞猜平台 2

5、向上递归

DROP FUNCTION IF EXISTS queryChildrenAreaInfo1;CREATE FUNCTION queryChildrenAreaInfo1(areaId INT)RETURNS VARCHAR(4000)BEGINDECLARE sTemp VARCHAR(4000);DECLARE sTempChd VARCHAR(4000);SET sTemp='$';SET sTempChd = CAST(areaId AS CHAR);SET sTemp = CONCAT(sTemp,',',sTempChd);SELECT parentId INTO sTempChd FROM t_areainfo WHERE id = sTempChd;WHILE sTempChd <> 0 DOSET sTemp = CONCAT(sTemp,',',sTempChd);SELECT parentId INTO sTempChd FROM t_areainfo WHERE id = sTempChd;END WHILE;RETURN sTemp;END;

6、调用形式

询问id为”7″的节点的具有上级节点:

SELECT * from t_areainfo where FIND_IN_SET(id,queryChildrenAreaInfo1(7));

欧洲杯竞猜平台 3

 

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