1.数据库有三个表，分别是bd_park(停车场)、bd_closed_park封闭停车场详细表，bd_park_user（停车管理员用户表）。
现在bd_park表有近1000条数据库，在bd_closed_park和bd_park_user中添加对应的数据。
SELECT * FROM bd_park_user;SELECT * FROM bd_closed_park;INSERT INTO bd_closed_park (close_park_id,park_id) SELECT UUID(),park_id FROM bd_park WHERE park_id NOT IN (SELECT park_id FROM bd_closed_park )SELECT * FROM bd_park;INSERT INTO bd_park_user (park_user_id,park_id,closed_park_id,username,PASSWORD,create_date) SELECT UUID(),A.PARK_ID,A.CLOSE_PARK_ID,REPLACE(getPY(REPLACE(REPLACE(park_name,'（',''),'）','')),' ',''),'e6f1f68ae88ae1cf786832117b05f19f',NOW()FROM (SELECT cp.park_id,cp.close_park_id,p.park_name FROM bd_closed_park cp,bd_park p WHERE p.park_id NOT IN (SELECT c.PARK_ID FROM bd_park_user u, bd_closed_park c WHERE c.park_id=u.park_id AND u.park_id IS NOT NULL ) AND cp.park_id=p.park_id ) ACOMMIT;SELECT park.* FROM bd_park park,bd_park_user u WHERE SELECT park.park_name,u.username,REPLACE(u.password,'e6f1f68ae88ae1cf786832117b05f19f','123456') FROM bd_park park LEFT JOIN bd_park_user u ON park.park_id=u.park_id REPLACE(getPY(REPLACE(REPLACE(REPLACE(p.park_name,'、',''),'（',''),'）','')),' ','')SELECT u.*,p.park_name,REPLACE(getPY(REPLACE(REPLACE(REPLACE(p.park_name,'、',''),'（',''),'）','')),' ','') FROM bd_park_user u LEFT JOIN bd_park p ON u.park_id=p.park_id WHERE u.username IS NULL;SELECT u.*,p.park_name,getPY(REPLACE(p.park_name,' ','')) FROM bd_park_user u LEFT JOIN bd_park p ON u.park_id=p.park_id WHERE u.username IS NULL;SELECT * FROM bd_closed_park WHERE park_id NOT IN (SELECT park_id FROM bd_park_user WHERE park_id IS NOT NULL);SELECT cp.park_id,cp.close_park_id,p.park_name FROM bd_closed_park cp,bd_park p WHERE p.park_id NOT IN (SELECT c.PARK_ID FROM bd_park_user u, bd_closed_park c WHERE c.park_id=u.park_id) AND cp.park_id=p.park_id SELECT c.park_id FROM bd_park_user u, bd_closed_park c WHERE c.park_id=u.park_id;SELECT UUID(),park_id FROM bd_closed_park WHERE park_id NOT IN (SELECT park_id FROM bd_park_user )SELECT * FROM bd_closed_park WHERE park_id ='0e0da2fa-723d-11e5-9fe3-44a8422565ee';SELECT * FROM bd_park WHERE park_id='1869fcd1_8755_11e5_800e_822ace0c0095';SELECT getPY('弘彧大厦停车场') FROM DUAL;SELECT REPLACE(REPLACE('南新华街停车场（路外）','（',''),'）','') FROM DUAL;SELECT park.park_name,u.username,REPLACE(u.password,'e6f1f68ae88ae1cf786832117b05f19f','123456') FROM bd_park park LEFT JOIN bd_park_user u ON park.park_id=u.park_id SELECT COUNT(A.username) c,A.username FROM bd_park_user A GROUP BY username HAVING c=1SELECT * FROM bd_park_user WHERE username='南三环东路25号停车场'; SELECT * FROM bd_park_user WHERE username IN( SELECT B.username FROM ( SELECT COUNT(A.username) c,A.username FROM bd_park_user A GROUP BY username HAVING c>1 )B)?
DELIMITER ;; CREATE FUNCTION `getPY`(in_string VARCHAR(21845)) RETURNS MEDIUMTEXT CHARSET utf8 BEGINDECLARE tmp_str VARCHAR(21845) CHARSET gbk DEFAULT '' ; #截取字符串，每次做截取后的字符串存放在该变量中，初始为函数参数in_string值 DECLARE tmp_len SMALLINT DEFAULT 0;#tmp_str的长度 DECLARE tmp_char VARCHAR(2) CHARSET gbk DEFAULT '';#截取字符，每次 left(tmp_str,1) 返回值存放在该变量中 DECLARE tmp_rs VARCHAR(21845) CHARSET gbk DEFAULT '';#结果字符串 DECLARE tmp_cc VARCHAR(2) CHARSET gbk DEFAULT '';#拼音字符，存放单个汉字对应的拼音首字符 SET tmp_str = in_string;#初始化，将in_string赋给tmp_str SET tmp_len = LENGTH(tmp_str);#初始化长度 WHILE tmp_len > 0 DO #如果被计算的tmp_str长度大于0则进入该while SET tmp_char = LEFT(tmp_str,1);#获取tmp_str最左端的首个字符，注意这里是获取首个字符，该字符可能是汉字，也可能不是。 SET tmp_cc = tmp_char;#左端首个字符赋值给拼音字符 IF LENGTH(tmp_char)>1 THEN#判断左端首个字符是多字节还是单字节字符，要是多字节则认为是汉字且作以下拼音获取，要是单字节则不处理。 SELECT ELT(INTERVAL(CONV(HEX(tmp_char),16,10),0xB0A1,0xB0C5,0xB2C1,0xB4EE,0xB6EA,0xB7A2,0xB8C1,0xB9FE,0xBBF7,0xBFA6,0xC0AC ,0xC2E8,0xC4C3,0xC5B6,0xC5BE,0xC6DA,0xC8BB,0xC8F6,0xCBFA,0xCDDA ,0xCEF4,0xD1B9,0xD4D1), 'A','B','C','D','E','F','G','H','J','K','L','M','N','O','P','Q','R','S','T','W','X','Y','Z') INTO tmp_cc; #获得汉字拼音首字符 END IF; SET tmp_rs = CONCAT(tmp_rs,tmp_cc);#将当前tmp_str左端首个字符拼音首字符与返回字符串拼接 SET tmp_str = SUBSTRING(tmp_str,2);#将tmp_str左端首字符去除 SET tmp_len = LENGTH(tmp_str);#计算当前字符串长度 END WHILE; RETURN tmp_rs;#返回结果字符串 END;;
?总结：生成数据成功，但是有缺点。在bd_park_user表中username是唯一的，但是已经存在重复的。因为停车场名称的首字母组成的字符串有可能是一样的。添加数据库的sql中没有做唯一校验。