快速密碼生成與MySQL

Original post http://anothermysqldba.blogspot.com/2015/07/quick-password-generation-with-mysql.html

 

這裡是一個快速而簡單的方法來生成使用MySQL密碼的應用程序。 
該查詢將創建一個大寫和小寫的長度和值隨機生成的密碼。 


SELECT CONCAT(UCASE(SUBSTRING( SUBSTRING(MD5(RAND()), FLOOR( 1 + (RAND() * 5)) , FLOOR( 8 + (RAND() * 15 )) ) , FLOOR( 1 + (RAND() * 4 )) , FLOOR( 4 + (RAND() * 12 )) )), 
SUBSTRING('!@#$%^&*', FLOOR( 1 + (RAND() * 4)) , FLOOR( 1 + (RAND() * 8)) ), 
SUBSTRING( SUBSTRING(MD5(RAND()), FLOOR( 1 + (RAND() * 5)) , FLOOR( 8 + (RAND() * 15 )) ) , 5)) as password \G 

該查詢將採取隨機值用於動態口令及第一部分上情況下，它在適用時則第二半它增加了一些符號那麼剩下的是在較低的情況下，因為MD5會自動導入。 你當然可以調整任何符號，你會喜歡。 

結果的實施例： 


CREATE TABLE `generated` ( 
`password` varchar(255) NOT NULL 
) ENGINE=InnoDB ; 

MariaDB [(none)]> INSERT INTO test.generated SELECT CONCAT(UCASE(SUBSTRING( SUBSTRING(MD5(RAND()), FLOOR( 1 + (RAND() * 5)) , FLOOR( 8 + (RAND() * 15 )) ) , FLOOR( 1 + (RAND() * 4 )) , FLOOR( 4 + (RAND() * 12 )) )), SUBSTRING('!@#$%^&*', FLOOR( 1 + (RAND() * 4)) , FLOOR( 1 + (RAND() * 8)) ),SUBSTRING( SUBSTRING(MD5(RAND()), FLOOR( 1 + (RAND() * 5)) , FLOOR( 8 + (RAND() * 15 )) ) , 5)) as password; 

MariaDB [(none)]> select * from test.generated; 
+-----------------------------------+ 
| password | 
+-----------------------------------+ 
| 7232E1D9$%^&*f7de22c1b14f15c8a6 | 
| DEE22B7F7#$%541adcdd1b8e2 | 
| 2C4BB81001@#$%^&d0d9a2126 | 
| 941D3B92D@#$%^a4b7be92 | 
| 1CF2563254FC@#a79bb5 | 
| 2AE86E7D6!@#$%^&*4ca03f2e8 | 
| 074DD8D3#$e70a1 | 
| B2DDC!@#$%^47a252f79 | 
| 3A6D0A#$%^&*01ce9278a2a | 
| E9FB4CD16E19!739db9faa1616505c | 
| 1ED7A2E1379B4!@#$%ebe60b | 
| E9B57D71DB1@#$%^e9a4f8c2e94bf3d35 | 
| C97982!@#$8b5c534653c06 | 
| DE8998057C8!@#$%^8977a807 | 
| 7C7172EB1AE5$%^&*79d2b27 | 
| B52CE71@#$%^&*4508 | 
| AB17714F!@#$%^&203ba4ff80f8a6 | 
| 558D@#$04087871e29ff54 | 
| 27A78E8EF#$%^b8cee8628d81593 | 
| 315F2EC4#ad9913ec0595c | 
+-----------------------------------+ 



MySQL的隨機整數

Original post: http://anothermysqldba.blogspot.com/2014/06/mysql-random-integers.html

這是不以任何手段的一項新功能，但它是一個問題，我也碰巧看到彈出飄飛。 所以，一個簡單的例子是下面的。 

到MySQL中生成一個隨機整數您可以使用地板和蘭德功能。 MySQL手冊此文件在這裡：http://dev.mysql.com/doc/refman/5.5/en/mathematical-functions.html＃function_rand 

“ 為了獲得範圍內的隨機整數R I <= R <J2，使用表達式FLOOR（i + RAND（）*（十-一）） “ 

所以，舉個例子： 

> SET @I = 3; # lower range 
> SET @J = 43 - @I; # max range minus lower range 

> SELECT FLOOR( @I + (RAND() * @J )) as lottery_numbers\G 
*************************** 1. row *************************** 
lottery_numbers: 4 
1 row in set (0.00 sec) 
> SELECT FLOOR( @I + (RAND() * @J )) as lottery_numbers\G 
*************************** 1. row *************************** 
lottery_numbers: 8 
1 row in set (0.00 sec 
> SELECT FLOOR( @I + (RAND() * @J )) as lottery_numbers\G 
*************************** 1. row *************************** 
lottery_numbers: 15 
1 row in set (0.00 sec 
> SELECT FLOOR( @I + (RAND() * @J )) as lottery_numbers\G 
*************************** 1. row *************************** 
lottery_numbers: 16 
1 row in set (0.00 sec 
> SELECT FLOOR( @I + (RAND() * @J )) as lottery_numbers\G 
*************************** 1. row *************************** 
lottery_numbers: 23 
1 row in set (0.00 sec 
> SELECT FLOOR( @I + (RAND() * @J )) as lottery_numbers\G 
*************************** 1. row *************************** 
lottery_numbers: 42 
1 row in set (0.00 sec