电商品牌列表的业务实现

品牌列表按照首字母排序：
实现方法一：可以在建品牌表时新建字段index ,(addida, index=A)等；
当然对于已经存在大量业务数据的表，可以采如下方案二：

DROP TABLE IF EXISTS af_coslers;
CREATE TABLE af_coslers (
id int(11) NOT NULL AUTO_INCREMENT COMMENT ‘主键id’,
f_py char(1) DEFAULT ” COMMENT ‘首字母拼音’,
c_begin smallint(5) unsigned NOT NULL COMMENT ‘该首字母拼音汉字编码起始值’,
c_end smallint(5) unsigned NOT NULL COMMENT ‘该首字母拼音汉字编码范围值’,
PRIMARY KEY (id)
) ENGINE=InnoDB AUTO_INCREMENT=76 DEFAULT CHARSET=utf8mb4 COMMENT=’首字母排序参照表’;

– Records of af_coslers

INSERT INTO af_coslers VALUES (‘1’, ‘A’, ‘45217’, ‘45252’);
INSERT INTO af_coslers VALUES (‘2’, ‘B’, ‘45253’, ‘45760’);
INSERT INTO af_coslers VALUES (‘3’, ‘C’, ‘45761’, ‘46317’);
INSERT INTO af_coslers VALUES (‘4’, ‘D’, ‘46318’, ‘46825’);
INSERT INTO af_coslers VALUES (‘5’, ‘E’, ‘46826’, ‘47009’);
INSERT INTO af_coslers VALUES (‘6’, ‘F’, ‘47010’, ‘47296’);
INSERT INTO af_coslers VALUES (‘7’, ‘G’, ‘47297’, ‘47613’);
INSERT INTO af_coslers VALUES (‘8’, ‘H’, ‘47614’, ‘48118’);
INSERT INTO af_coslers VALUES (‘9’, ‘J’, ‘48119’, ‘49061’);
INSERT INTO af_coslers VALUES (‘10’, ‘K’, ‘49062’, ‘49323’);
INSERT INTO af_coslers VALUES (‘11’, ‘L’, ‘49324’, ‘49895’);
INSERT INTO af_coslers VALUES (‘12’, ‘M’, ‘49896’, ‘50370’);
INSERT INTO af_coslers VALUES (‘13’, ‘N’, ‘50371’, ‘50613’);
INSERT INTO af_coslers VALUES (‘14’, ‘O’, ‘50614’, ‘50621’);
INSERT INTO af_coslers VALUES (‘15’, ‘P’, ‘50622’, ‘50905’);
INSERT INTO af_coslers VALUES (‘16’, ‘Q’, ‘50906’, ‘51386’);
INSERT INTO af_coslers VALUES (‘17’, ‘R’, ‘51387’, ‘51445’);
INSERT INTO af_coslers VALUES (‘18’, ‘S’, ‘51446’, ‘52217’);
INSERT INTO af_coslers VALUES (‘19’, ‘T’, ‘52218’, ‘52697’);
INSERT INTO af_coslers VALUES (‘20’, ‘W’, ‘52698’, ‘52979’);
INSERT INTO af_coslers VALUES (‘21’, ‘X’, ‘52980’, ‘53640’);
INSERT INTO af_coslers VALUES (‘22’, ‘Y’, ‘53689’, ‘54480’);
INSERT INTO af_coslers VALUES (‘23’, ‘Z’, ‘54481’, ‘55289’);

INSERT INTO af_coslers VALUES (‘24’, ‘A’, ‘97’, ‘97’);
INSERT INTO af_coslers VALUES (‘25’, ‘A’, ‘65’, ‘65’);
INSERT INTO af_coslers VALUES (‘26’, ‘B’, ‘98’, ‘98’);
INSERT INTO af_coslers VALUES (‘27’, ‘B’, ‘66’, ‘66’);
INSERT INTO af_coslers VALUES (‘28’, ‘C’, ‘99’, ‘99’);
INSERT INTO af_coslers VALUES (‘29’, ‘C’, ‘67’, ‘67’);
INSERT INTO af_coslers VALUES (‘30’, ‘D’, ‘100’, ‘100’);
INSERT INTO af_coslers VALUES (‘31’, ‘D’, ‘68’, ‘68’);
INSERT INTO af_coslers VALUES (‘32’, ‘E’, ‘69’, ‘69’);
INSERT INTO af_coslers VALUES (‘33’, ‘E’, ‘101’, ‘101’);
INSERT INTO af_coslers VALUES (‘34’, ‘F’, ‘70’, ‘70’);
INSERT INTO af_coslers VALUES (‘35’, ‘F’, ‘102’, ‘102’);
INSERT INTO af_coslers VALUES (‘36’, ‘G’, ‘71’, ‘71’);
INSERT INTO af_coslers VALUES (‘37’, ‘G’, ‘103’, ‘103’);
INSERT INTO af_coslers VALUES (‘38’, ‘H’, ‘104’, ‘104’);
INSERT INTO af_coslers VALUES (‘39’, ‘H’, ‘72’, ‘72’);
INSERT INTO af_coslers VALUES (‘40’, ‘I’, ‘73’, ‘73’);
INSERT INTO af_coslers VALUES (‘41’, ‘I’, ‘105’, ‘105’);
INSERT INTO af_coslers VALUES (‘42’, ‘G’, ‘106’, ‘106’);
INSERT INTO af_coslers VALUES (‘43’, ‘G’, ‘74’, ‘74’);
INSERT INTO af_coslers VALUES (‘44’, ‘K’, ‘75’, ‘75’);
INSERT INTO af_coslers VALUES (‘45’, ‘K’, ‘107’, ‘107’);
INSERT INTO af_coslers VALUES (‘46’, ‘L’, ‘108’, ‘108’);
INSERT INTO af_coslers VALUES (‘47’, ‘L’, ‘76’, ‘76’);
INSERT INTO af_coslers VALUES (‘48’, ‘M’, ‘77’, ‘77’);
INSERT INTO af_coslers VALUES (‘49’, ‘M’, ‘109’, ‘109’);
INSERT INTO af_coslers VALUES (‘50’, ‘N’, ‘78’, ‘78’);
INSERT INTO af_coslers VALUES (‘51’, ‘N’, ‘110’, ‘110’);
INSERT INTO af_coslers VALUES (‘52’, ‘O’, ‘79’, ‘79’);
INSERT INTO af_coslers VALUES (‘53’, ‘O’, ‘111’, ‘111’);
INSERT INTO af_coslers VALUES (‘54’, ‘P’, ‘80’, ‘80’);
INSERT INTO af_coslers VALUES (‘55’, ‘P’, ‘112’, ‘112’);
INSERT INTO af_coslers VALUES (‘56’, ‘Q’, ‘81’, ‘81’);
INSERT INTO af_coslers VALUES (‘57’, ‘Q’, ‘113’, ‘113’);
INSERT INTO af_coslers VALUES (‘58’, ‘R’, ‘82’, ‘82’);
INSERT INTO af_coslers VALUES (‘59’, ‘R’, ‘114’, ‘114’);
INSERT INTO af_coslers VALUES (‘60’, ‘S’, ‘83’, ‘83’);
INSERT INTO af_coslers VALUES (‘61’, ‘S’, ‘115’, ‘115’);
INSERT INTO af_coslers VALUES (‘62’, ‘T’, ‘84’, ‘84’);
INSERT INTO af_coslers VALUES (‘63’, ‘T’, ‘116’, ‘116’);
INSERT INTO af_coslers VALUES (‘64’, ‘U’, ‘117’, ‘117’);
INSERT INTO af_coslers VALUES (‘65’, ‘U’, ‘85’, ‘85’);
INSERT INTO af_coslers VALUES (‘66’, ‘V’, ‘86’, ‘86’);
INSERT INTO af_coslers VALUES (‘67’, ‘V’, ‘118’, ‘118’);
INSERT INTO af_coslers VALUES (‘68’, ‘W’, ‘87’, ‘87’);
INSERT INTO af_coslers VALUES (‘69’, ‘W’, ‘119’, ‘119’);
INSERT INTO af_coslers VALUES (‘70’, ‘X’, ‘88’, ‘88’);
INSERT INTO af_coslers VALUES (‘71’, ‘X’, ‘120’, ‘120’);
INSERT INTO af_coslers VALUES (‘72’, ‘Y’, ‘89’, ‘89’);
INSERT INTO af_coslers VALUES (‘73’, ‘Y’, ‘121’, ‘121’);
INSERT INTO af_coslers VALUES (‘74’, ‘Z’, ‘90’, ‘90’);
INSERT INTO af_coslers VALUES (‘75’, ‘Z’, ‘122’, ‘122’);

查询的sql:
SELECT t1.id rid, t1.name, t2.f_py nameIndex
FROM af_brand t1, af_coslers t2
WHERE CONV(HEX(LEFT(CONVERT(t1.name USING gbk ), 1)), 16, 10) BETWEEN t2.c_begin AND t2.c_end and t1.is_delete = 0
ORDER BY convert(t1.name using gbk) ASC;
将结果封装为对象，数据结构为map(“A”,brandList);