MySQL数据库加密和解密~认证登陆密码(mysql.user)和MySQL不区分大小写

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MySQL数据库认证密码有两种方式:1：MySQL 4.1版本之前是MySQL323加密2：MySQL 4.1和之后的版本都是MySQLSHA1加密还有函数:AES_ENCRYPT()加密函数和AES_DECRYPT()解密函数和MD5()加密。MySQL数据库中自带old_password(str)和password(str)函数,前者是MySQL323加密,后者是MySQLSHA1方式加密;MYSQL323加密中生成的是16位字符串,而在MySQLSHA1中生存的是41位字符串,其中*是不加入实际的密码运算中,就是说MySQLSHA1加密的密码的实际位数是40位;MYSQL323对应于old_password(str)函数MYSQLSHA1对应于password(str)函数注：AES_ENCRYPT()加密函数和AES_DECRYPT()解密函数都需要一个“key”来协助加密。eg:select aes_encrypt('kaka123','key');   select aes_decrypt(aes_encrypt('kaka123','key'),'key');

1.MYSQL323对应于old_password(str)函数加密：

mysql> select old_password('kaka123');+-------------------------+| old_password('kaka123') |+-------------------------+| 2ee53a20184c9267        |+-------------------------+1 row in set, 1 warning (0.00 sec)

2.MYSQLSHA1对应于password(str)函数加密：

 mysql> select password('kaka123');+-------------------------------------------+| password('kaka123')                       |+-------------------------------------------+| *90B3D884FB6092549F244125549B77C000A0F9C6 |+-------------------------------------------+1 row in set (0.00 sec)

3.MYSQL MD5()加密：

mysql> select md5('kaka123');+----------------------------------+| md5('kaka123')                   |+----------------------------------+| 5d052f1e32af4e4ac2544a5fc2a9b992 |+----------------------------------+1 row in set (0.00 sec)

4.AES_ENCRYPT()加密函数

mysql> select aes_encrypt('kaka123','key');+------------------------------+| aes_encrypt('kaka123','key') |+------------------------------+| D#jA                 |+------------------------------+1 row in set (0.00 sec)

5.AES_DECRYPT()解密函数

mysql> select aes_decrypt(aes_encrypt('kaka123','key'),'key');+-------------------------------------------------+| aes_decrypt(aes_encrypt('kaka123','key'),'key') |+-------------------------------------------------+| kaka123                                         |+-------------------------------------------------+1 row in set (0.00 sec)

4.AES_ENCRYPT()加密函数

mysql> select host,user,password from mysql.user;+----------------+------+-------------------------------------------+| host           | user | password                                  |+----------------+------+-------------------------------------------+| localhost      | root | *71ABCA8B06D46066CEF8062A75256E66243D0FC8 || tony\_ts\_tian | root | *71ABCA8B06D46066CEF8062A75256E66243D0FC8 || 127.0.0.1      | root | *71ABCA8B06D46066CEF8062A75256E66243D0FC8 || ::1            | root | *71ABCA8B06D46066CEF8062A75256E66243D0FC8 || %              | root | *71ABCA8B06D46066CEF8062A75256E66243D0FC8 || %              | kaka | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |+----------------+------+-------------------------------------------+6 rows in set (0.00 sec)mysql> update mysql.user set password=AES_ENCRYPT("kaka123",'key') where host='%' and user='kaka';Query OK, 1 row affected (0.00 sec)Rows matched: 1  Changed: 1  Warnings: 0mysql>  select host,user,password from mysql.user;+----------------+------+-------------------------------------------+| host           | user | password                                  |+----------------+------+-------------------------------------------+| localhost      | root | *71ABCA8B06D46066CEF8062A75256E66243D0FC8 || tony\_ts\_tian | root | *71ABCA8B06D46066CEF8062A75256E66243D0FC8 || 127.0.0.1      | root | *71ABCA8B06D46066CEF8062A75256E66243D0FC8 || ::1            | root | *71ABCA8B06D46066CEF8062A75256E66243D0FC8 || %              | root | *71ABCA8B06D46066CEF8062A75256E66243D0FC8 || %              | kaka | œDŸ#jAÂ                          |       ¯Ll +----------------+------+-------------------------------------------+6 rows in set (0.00 sec)

5.AES_DECRYPT()解密函数

mysql> select host,user,AES_DECRYPT(password,'key') from mysql.user;+----------------+------+-----------------------------+| host           | user | AES_DECRYPT(password,'key') |+----------------+------+-----------------------------+| localhost      | root | NULL                        || tony\_ts\_tian | root | NULL                        || 127.0.0.1      | root | NULL                        || ::1            | root | NULL                        || %              | root | NULL                        || %              | kaka | kaka123                     |+----------------+------+-----------------------------+6 rows in set (0.00 sec)

mysql不区分大小写:

修改MySql Server安装目录下的 my.ini 或my.conf文件

在mysqld节下加入下面一行lower_case_table_names=0 （0：大小写敏感；1：大小写不敏感）最后重启一下MySql服务即可。 修改对于新建的表，老表无效

#解决mysql字段不区分大小写:

CREATE TABLE `user`(`id` BIGINT NOT NULL AUTO_INCREMENT COMMENT'用户登录表主键id',`uname` VARCHAR(35) NOT NULL COMMENT'用户登录名',`upass` VARCHAR(32) NOT NULL COMMENT'用户登录密码',`ustatus` VARCHAR(2) NOT NULL DEFAULT '0' COMMENT'用户登录状态,0为正常，1为锁定',UNIQUE (`uname`),PRIMARY KEY(`id`))ENGINE = INNODB COLLATE=utf8_bin COMMENT='用户登录表';

注：COLLATE=utf8_bin

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