MySQL创建用户与授权及撤销用户权限方法
MySQL中创建用户与授权的实现方法。
运行环境：widnowsxpprofessional+MySQL5.0
一,创建用户
命令:CREATEUSER'username'@'host'IDENTIFIEDBY'password';
说明:username-你将创建的用户名,host-指定该用户在哪个主机上可以登陆,如果是本地用户可用localhost,如果想让该用户可以从任意远程主机登陆,可以使用通配符%.password-该用户的登陆密码,密码可以为空,如果为空则该用户可以不需要密码登陆mysql服务器.
例子:
CREATEUSER'dog'@'localhost'IDENTIFIEDBY'123456'; CREATEUSER'pig'@'192.168.1.101_'IDENDIFIEDBY'123456'; CREATEUSER'pig'@'%'IDENTIFIEDBY'123456'; CREATEUSER'pig'@'%'IDENTIFIEDBY''; CREATEUSER'pig'@'%';
二,授权
命令:GRANTprivilegesONdatabasename.tablenameTO'username'@'host'
说明:privileges-用户的操作权限,如SELECT,INSERT,UPDATE等(详细列表见该文最后面).如果要授予所的权限则使用ALL.;databasename-数据库名,tablename-表名,如果要授予该用户对所有数据库和表的相应操作权限则可用*表示,如*.*.
例子:
GRANTSELECT,INSERTONtest.userTO'pig'@'%'; GRANTALLON*.*TO'pig'@'%';
注意:用以上命令授权的用户不能给其它用户授权,如果想让该用户可以授权,用以下命令:
GRANTprivilegesONdatabasename.tablenameTO'username'@'host'WITHGRANTOPTION;
三.设置与更改用户密码
命令:SETPASSWORDFOR'username'@'host'=PASSWORD('newpassword');如果是当前登陆用户用SETPASSWORD=PASSWORD("newpassword");
例子:SETPASSWORDFOR'pig'@'%'=PASSWORD("123456");
四.撤销用户权限
命令:REVOKEprivilegeONdatabasename.tablenameFROM'username'@'host';
说明:privilege,databasename,tablename-同授权部分.
例子:REVOKESELECTON*.*FROM'pig'@'%';
注意:假如你在给用户'pig'@'%'授权的时候是这样的(或类似的):GRANTSELECTONtest.userTO'pig'@'%',则在使用REVOKESELECTON*.*FROM'pig'@'%';命令并不能撤销该用户对test数据库中user表的SELECT操作.相反,如果授权使用的是GRANTSELECTON*.*TO'pig'@'%';则REVOKESELECTONtest.userFROM'pig'@'%';命令也不能撤销该用户对test数据库中user表的Select权限.（www.nhooo.com脚本学堂）
具体信息可以用命令SHOWGRANTSFOR'pig'@'%';查看.
五.删除用户
命令:DROPUSER'username'@'host';
附表:在MySQL中的操作权限
ALTERAllowsuseofALTERTABLE. ALTERROUTINEAltersordropsstoredroutines. CREATEAllowsuseofCREATETABLE. CREATEROUTINECreatesstoredroutines. CREATETEMPORARYTABLEAllowsuseofCREATETEMPORARYTABLE. CREATEUSERAllowsuseofCREATEUSER,DROPUSER,RENAMEUSER,andREVOKEALLPRIVILEGES. CREATEVIEWAllowsuseofCREATEVIEW. DELETEAllowsuseofDELETE. DROPAllowsuseofDROPTABLE. EXECUTEAllowstheusertorunstoredroutines. FILEAllowsuseofSELECT...INTOOUTFILEandLOADDATAINFILE. INDEXAllowsuseofCREATEINDEXandDROPINDEX. INSERTAllowsuseofINSERT. LOCKTABLESAllowsuseofLOCKTABLESontablesforwhichtheuseralsohasSELECTprivileges. PROCESSAllowsuseofSHOWFULLPROCESSLIST. RELOADAllowsuseofFLUSH. REPLICATIONAllowstheusertoaskwhereslaveormaster CLIENTserversare. REPLICATIONSLAVENeededforreplicationslaves. SELECTAllowsuseofSELECT. SHOWDATABASESAllowsuseofSHOWDATABASES. SHOWVIEWAllowsuseofSHOWCREATEVIEW. SHUTDOWNAllowsuseofmysqladminshutdown. SUPERAllowsuseofCHANGEMASTER,KILL,PURGEMASTERLOGS,andSETGLOBALSQLstatements.Allowsmysqladmindebugcommand.Allowsoneextraconnectiontobemadeifmaximumconnectionsarereached. UPDATEAllowsuseofUPDATE. USAGEAllowsconnectionwithoutanyspecificprivileges.