MySQL fragt alle Daten rekursiv ab: Erstellen Sie zuerst eine Tabelle und initialisieren Sie die Daten. Verwenden Sie dann die Funktion [find_in_set()] und die Funktion [group_concat()], um die rekursive Abfrage zu implementieren. Der Code lautet [SELECT queryChildrenAreaInfo(1); ].
Weitere verwandte kostenlose Lernempfehlungen: MySQL-Tutorial(Video)
MySQL-Methode zur rekursiven Abfrage aller Daten:
1. Erstellen Sie eine Tabelle
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. Erste Daten
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. Abwärtsrekursion
Verwenden Sie die find_in_set()
函数和group_concat()
-Funktion, um eine rekursive Abfrage zu implementieren:
DROP FUNCTION IF EXISTS queryChildrenAreaInfo; DELIMITER ;; CREATE FUNCTION queryChildrenAreaInfo(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(id) INTO sTempChd FROM t_areainfo WHERE FIND_IN_SET(parentId,sTempChd)>0; END WHILE; RETURN sTemp; END ;; DELIMITER ;
SELECT queryChildrenAreaInfo(1);
Fragen Sie alle Knoten unter der ID „4“ ab.
SELECT * FROM t_areainfo WHERE FIND_IN_SET(id,queryChildrenAreaInfo(4));
5. Aufwärtsrekursion
Das obige ist der detaillierte Inhalt vonSo fragen Sie alle Daten in MySQL rekursiv ab. Für weitere Informationen folgen Sie bitte anderen verwandten Artikeln auf der PHP chinesischen Website!