存放在计算机中大量信息的安全问题以及敏感信息的防窃取、防篡改问题已经越来越引起人们的关注。为了实现对数据库管理系统中数据安全的需求，文中对系统的用户口令、C/S之间的签名认证、SQL Server 2005数据库加密、系统分配角色和用户权限几方面对数据库管理系统的安全问题进行研究，使用C#和T-SQL语言进行具体实现。实际应用表明，这些措施能够准确地实现数据的加密，阻止非法用户操作系统，保证系统安全，达到了设计要求。
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.002562s ]
SELECT `a`.`aid`,`a`.`title`,`a`.`create_time`,`m`.`username` FROM `jrk_downrecords` `a` INNER JOIN `jrk_member` `m` ON `a`.`uid`=`m`.`id` WHERE `a`.`status` = 1 GROUP BY `a`.`aid` ORDER BY `a`.`create_time` DESC LIMIT 10 [ RunTime:0.182140s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.000991s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001754s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.004811s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003575s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000883s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.004952s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015575s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001065s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 571462 [ RunTime:0.023270s ]
