SQL Server - Donner des droits sur toutes les bases

DECLARE @DBName varchar(255)
DECLARE @MyAccount varchar(255)
DECLARE @DATABASES_Fetch int
DECLARE DATABASES_CURSOR CURSOR FOR

select name
from sys.databases
Where
-- Only look at databases to which we have access
has_dbaccess(name) = 1
-- Not master, tempdb or model
and name not in ('Master','tempdb','model','msdb')
order by 1

SET @MyAccount = 'MyDomain\MyLogin'

OPEN DATABASES_CURSOR
FETCH NEXT FROM DATABASES_CURSOR INTO @DBName
WHILE @@FETCH_STATUS = 0
BEGIN
	PRINT 'Process Database ' + @DBName
	--Mapper le user sur la base
	EXEC('USE ['+@dbname+']; CREATE USER [' + @MyAccount + '] FOR LOGIN [' + @MyAccount + ']')
	--Donner des droits de lecture au user sur la base
	EXEC('USE ['+@dbname+'] exec sp_addrolemember "db_datareader","' + @MyAccount + '"')

	--EXEC('USE ['+@dbname+'] exec sp_droprolemember "db_datareader","' + @MyAccount + '"')
	--EXEC('USE ['+@dbname+'];  DROP SCHEMA [' + @MyAccount + '];')
	--EXEC('USE ['+@dbname+'];  DROP USER [' + @MyAccount + '];')
	--EXEC('USE ['+@dbname+'] exec sp_change_users_login "Update_One", "' + @MyAccount + '","' + @MyAccount + '";')
FETCH NEXT FROM DATABASES_CURSOR INTO @DBName
END
CLOSE DATABASES_CURSOR
DEALLOCATE DATABASES_CURSOR