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') |
+-------------------------+
| 2ee53a4c9267 |
+-------------------------+
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: 0
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 | 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