CREATE DEFINER=`root`@`%` FUNCTION `genDate`(
    start_time VARCHAR(10),
    end_time VARCHAR(10)
) RETURNS VARCHAR(255) CHARSET utf8mb4
BEGIN
  DECLARE random_date DATETIME DEFAULT NULL;
  SET random_date = CONCAT(
    (DATE(FROM_UNIXTIME(UNIX_TIMESTAMP(start_time) + FLOOR(RAND() * (UNIX_TIMESTAMP(end_time) - UNIX_TIMESTAMP(start_time) + 1))))), 
      ' ',  
            FLOOR(RAND() * 24),  ':', FLOOR(RAND() * 60), ':', FLOOR(RAND() * 60)
    );
  RETURN date_format(random_date,'%Y-%m-%d %H:%i:%s');
END

> select genDate('2020-01-01','2023-01-01');
2020-06-22 4:25:35

CREATE DEFINER=`root`@`%` FUNCTION `genUsername`() RETURNS varchar(255) CHARSET utf8mb4
BEGIN
    DECLARE first_name_dict VARCHAR(2056) DEFAULT '趙錢(qián)孫李周鄭王馮陳楮衛(wèi)蔣沈韓楊朱秦尤許何呂施張孔曹?chē)?yán)華金魏陶姜戚謝喻柏水竇章云蘇潘葛奚范彭郎魯韋昌馬苗鳳花方俞任袁柳酆鮑史唐費(fèi)廉岑薛雷賀倪湯滕殷羅畢郝鄔安常樂(lè)于時(shí)傅皮齊康伍余元卜顧孟平黃和穆蕭尹姚邵湛汪祁毛禹狄米貝明臧計(jì)伏成戴談宋茅龐熊紀(jì)舒屈項(xiàng)祝董梁杜阮藍(lán)閩席季麻強(qiáng)賈路婁危江童顏郭梅盛林刁鍾徐丘駱高夏蔡田樊胡凌霍虞萬(wàn)支柯昝管盧莫經(jīng)裘繆干解應(yīng)宗丁宣賁鄧郁單杭洪包諸左石崔吉鈕龔程嵇邢滑裴陸榮翁';
    DECLARE last_name_dict VARCHAR(2056) DEFAULT '嘉懿煜城懿軒燁偉苑博偉澤熠彤鴻煊博濤燁霖?zé)钊A煜祺智宸正豪昊然明杰誠(chéng)立軒立輝峻熙弘文熠彤鴻煊燁霖哲瀚鑫鵬致遠(yuǎn)俊馳雨澤燁磊晟睿天佑文昊修潔黎昕遠(yuǎn)航旭堯鴻濤偉祺軒越澤浩宇瑾瑜皓軒擎蒼擎宇志澤睿淵楷瑞軒弘文哲瀚雨澤鑫磊夢(mèng)琪憶之桃慕青問(wèn)蘭爾嵐元香初夏沛菡傲珊曼文樂(lè)菱癡珊恨玉惜文香寒新柔語(yǔ)蓉海安夜蓉涵柏水桃醉藍(lán)春兒語(yǔ)琴?gòu)耐燎缯Z(yǔ)蘭又菱碧彤元霜憐夢(mèng)紫寒妙彤曼易南蓮紫翠雨寒易煙如萱若南尋真曉亦向珊慕靈以蕊尋雁映易雪柳孤嵐笑霜海云凝天沛珊寒云冰旋宛兒綠真盼兒曉霜碧凡夏菡曼香若煙半夢(mèng)雅綠冰藍(lán)靈槐平安書(shū)翠翠風(fēng)香巧代云夢(mèng)曼幼翠友巧聽(tīng)寒夢(mèng)柏醉易訪(fǎng)旋亦玉凌萱訪(fǎng)卉懷亦笑藍(lán)春翠靖柏夜蕾冰夏夢(mèng)松書(shū)雪樂(lè)楓念薇靖雁尋春恨山從寒憶香覓波靜曼凡旋以亦念露芷蕾千蘭新波代真新蕾雁玉冷卉紫山千琴恨天傲芙盼山懷蝶冰蘭山柏翠萱樂(lè)丹翠柔谷山之瑤冰露爾珍谷雪樂(lè)萱涵菡海蓮傲蕾青槐冬兒易夢(mèng)惜雪宛海之柔夏青亦瑤妙菡春竹修杰偉誠(chéng)建輝晉鵬天磊紹輝澤洋明軒健柏煊昊強(qiáng)偉宸博超君浩子騫明輝鵬濤炎彬鶴軒越彬風(fēng)華靖琪明誠(chéng)高格光華國(guó)源宇晗昱涵潤(rùn)翰飛翰海昊乾浩博和安弘博鴻朗華奧華燦嘉慕堅(jiān)秉建明金鑫錦程瑾瑜鵬經(jīng)賦景同靖琪君昊俊明季同開(kāi)濟(jì)凱安康成樂(lè)語(yǔ)力勤良哲理群茂彥敏博明達(dá)朋義彭澤鵬舉濮存溥心璞瑜浦澤奇邃祥榮軒';
    DECLARE first_name VARCHAR(3) DEFAULT substring(first_name_dict, floor(length(first_name_dict) / 3 * rand()), 1);
    DECLARE last_name VARCHAR(9);
    DECLARE full_name_length INT DEFAULT FLOOR(2+(RAND()*3))*3;
    DECLARE full_name VARCHAR(12) DEFAULT first_name;
    
  WHILE LENGTH(full_name) < full_name_length DO
        SET full_name = CONCAT(full_name, substring(last_name_dict, floor(length(last_name_dict) / 3 * rand()), 1));
    END WHILE;
    
    return full_name;
END

> select genUsername();
凌之澤

CREATE FUNCTION `splitStr` (
  str VARCHAR (1000),
  delimiter VARCHAR (5),
  str_order INT
) RETURNS VARCHAR (255) CHARSET utf8mb4 DETERMINISTIC
BEGIN
  DECLARE result VARCHAR (255) DEFAULT '';

  SET result = REVERSE(
    substring_index(
      REVERSE(
        substring_index(
          str,
          delimiter,
          str_order
        )
      ),
      delimiter,
      1
    )
  );
  RETURN result;
END

> select splitStr('I love MySQL',' ','2);
love

CREATE DEFINER=`root`@`%` FUNCTION `genMobile`() RETURNS char(11) CHARSET utf8mb4 NOT DETERMINISTIC
BEGIN
    DECLARE head VARCHAR(100) DEFAULT '132,133,139,183,186,187,130,131,189,151,156,157,176,134,135,137,138,136,000';
    DECLARE content CHAR(10) DEFAULT '0123456789';
    DECLARE phone CHAR(20) DEFAULT splitStr(head, ',', FLOOR(1 + RAND() * 19));
    DECLARE i int DEFAULT 1;
  
    WHILE i<9 DO
        SET i=i+1;
        SET phone = CONCAT(phone, substring(content, floor(1 + RAND() * 10), 1));
    END WHILE;
    RETURN phone;
END

> select genMobile();
18975304923

CREATE TABLE `t_user` (
  `user_id` int(11) NOT NULL AUTO_INCREMENT,
  `username` varchar(50) DEFAULT NULL,
  `sex` tinyint(1) DEFAULT NULL,
  `mobile` varchar(45) DEFAULT NULL,
  `create_time` datetime DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`user_id`),
  KEY `idx_create_time` (`create_time`) USING BTREE
) ENGINE=InnoDB AUTO_INCREMENT=100001 DEFAULT CHARSET=utf8mb4

CREATE DEFINER=`root`@`%` PROCEDURE `t_user_batch_insert`(IN size INT)
BEGIN
  declare i int default 0;
    while i < size do
    insert into t_user(username,sex,mobile) values(genUsername(),floor(rand() * 2),genMobile());
        set i = i + 1;
    end while;
END

> call t_user_batch_insert(100000);