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知方可补不足~SQL数据库用户的克隆，SQL集群的用户同步问题

我们知道在为sqlserver建立功能数据库时，通过会为库再建立一个登陆名，而这个登陆名时，只用来管理这个数据库，这是安全的，正确的。

我们在建立一个用户时，通过会把指定的数据库添加到“用户映射”里，这时你的用户与数据库就有了关系，在使用用户登陆时，你只能看到与该用户有映射关系的数据库！

在SQL的集群环境下，假设你有两台服务器，它们之间建立集群，这时，你希望把A服务器的数据库用户同步到B服务器上，你当然可以手动在B上建立一个SQL用户，但这时，你也必须重新建立一个数据库的映射关系，因为这时用户名的SID已经不同了，如果希望在建立用户时同时绑定之前的数据库映射，我们需要使用下载的语句实现

CREATE PROCEDURE #sp_hexadecimal  @binvalue varbinary(256),  @hexvalue varchar (514) OUTPUT AS DECLARE @charvalue varchar (514) DECLARE @i int DECLARE @length int DECLARE @hexstring char(16) SELECT @charvalue = '0x' SELECT @i = 1 SELECT @length = DATALENGTH (@binvalue) SELECT @hexstring = '0123456789ABCDEF' WHILE (@i <= @length) BEGIN DECLARE @tempint int DECLARE @firstint int DECLARE @secondint int SELECT @tempint = CONVERT(int, SUBSTRING(@binvalue,@i,1)) SELECT @firstint = FLOOR(@tempint/16) SELECT @secondint = @tempint - (@firstint*16) SELECT @charvalue = @charvalue + SUBSTRING(@hexstring, @firstint+1, 1) + SUBSTRING(@hexstring, @secondint+1, 1) SELECT @i = @i + 1 END SELECT @hexvalue = @charvalue GO DECLARE @name sysname DECLARE @type varchar (1) DECLARE @hasaccess int DECLARE @denylogin int DECLARE @is_disabled int DECLARE @PWD_varbinary  varbinary (256) DECLARE @PWD_string  varchar (514) DECLARE @Principal_id int DECLARE @SID_varbinary varbinary (85) DECLARE @SID_string varchar (514) DECLARE @tmpstr  varchar (1024) DECLARE @is_policy_checked varchar (3) DECLARE @is_expiration_checked varchar (3) DECLARE @defaultdb sysname DECLARE @language sysname DECLARE @rolename sysname DECLARE login_curs CURSOR FOR SELECT  p.principal_id, p.sid,  p.name,  p.type,  p.is_disabled,  p.default_database_name,  p.default_language_name, l.hasaccess,  l.denylogin  FROM  sys.server_principals p  LEFT JOIN  sys.syslogins l ON ( l.name = p.name )  WHERE  p.type IN ( 'S', 'G', 'U' ) AND  p.name <> 'sa' OPEN login_curs FETCH NEXT FROM login_curs INTO @Principal_id, @SID_varbinary, @name, @type, @is_disabled, @defaultdb, @language, @hasaccess, @denylogin IF (@@fetch_status = -1) BEGIN   PRINT 'No login(s) found.'   CLOSE login_curs   DEALLOCATE login_curs   RETURN END SET @tmpstr = '** Generated ' + CONVERT (varchar, GETDATE()) + ' on ' + @@SERVERNAME + ' */' PRINT @tmpstr PRINT '' WHILE (@@fetch_status <> -1) BEGIN IF (@@fetch_status <> -2) BEGIN PRINT '' SET @tmpstr = '-- Login: ' + @name PRINT @tmpstr IF (@type IN ( 'G', 'U')) BEGIN -- NT authenticated account/group SET @tmpstr = 'CREATE LOGIN ' + QUOTENAME( @name ) + ' FROM WINDOWS WITH DEFAULT_DATABASE = [' + @defaultdb + '], DEFAULT_LANGUAGE = [' + @language + ']' END ELSE  BEGIN -- SQL Server authentication -- obtain password and sid    SET @PWD_varbinary = CAST( LOGINPROPERTY( @name, 'PasswordHash' ) AS varbinary (256) ) EXEC #sp_hexadecimal @PWD_varbinary, @PWD_string OUT EXEC #sp_hexadecimal @SID_varbinary,@SID_string OUT -- obtain password policy state SELECT @is_policy_checked = CASE is_policy_checked WHEN 1 THEN 'ON' WHEN 0 THEN 'OFF' ELSE NULL END FROM sys.sql_logins WHERE name = @name SELECT @is_expiration_checked = CASE is_expiration_checked WHEN 1 THEN 'ON' WHEN 0 THEN 'OFF' ELSE NULL END FROM sys.sql_logins WHERE name = @name    SET @tmpstr = 'CREATE LOGIN ' + QUOTENAME( @name ) + ' WITH PASSWORD = ' + @PWD_string + ' HASHED, SID = ' + @SID_string + ', DEFAULT_DATABASE = [' + @defaultdb + '], DEFAULT_LANGUAGE = [' + @language + ']' IF ( @is_policy_checked IS NOT NULL ) BEGIN SET @tmpstr = @tmpstr + ', CHECK_POLICY = ' + @is_policy_checked END IF ( @is_expiration_checked IS NOT NULL ) BEGIN SET @tmpstr = @tmpstr + ', CHECK_EXPIRATION = ' + @is_expiration_checked END END IF (@denylogin = 1) BEGIN -- login is denied access SET @tmpstr = @tmpstr + '; DENY CONNECT SQL TO ' + QUOTENAME( @name ) END ELSE IF (@hasaccess = 0) BEGIN -- login exists but does not have access SET @tmpstr = @tmpstr + '; REVOKE CONNECT SQL TO ' + QUOTENAME( @name ) END IF (@is_disabled = 1) BEGIN -- login is disabled SET @tmpstr = @tmpstr + '; ALTER LOGIN ' + QUOTENAME( @name ) + ' DISABLE' END PRINT @tmpstr PRINT 'GO' DECLARE server_role_members_curs CURSOR FOR  SELECT  (SELECT [name] FROM sys.server_principals WHERE principal_id = role_principal_id) AS rolename FROM  sys.server_role_members  WHERE  member_principal_id = @Principal_id OPEN server_role_members_curs FETCH NEXT FROM server_role_members_curs INTO @rolename WHILE (@@fetch_status <> -1) BEGIN SELECT @tmpstr = 'EXEC master..sp_addsrvrolemember @loginame = N''' + @name + ''', @rolename = N''' + @rolename + '''' PRINT @tmpstr PRINT 'GO' FETCH NEXT FROM server_role_members_curs INTO @rolename END CLOSE server_role_members_curs DEALLOCATE server_role_members_curs  END FETCH NEXT FROM login_curs INTO @Principal_id, @SID_varbinary, @name, @type, @is_disabled, @defaultdb, @language, @hasaccess, @denylogin END CLOSE login_curs DEALLOCATE login_curs GO DROP PROCEDURE #sp_hexadecimal GO