To change all databases to Simple Recovery except system databases

USE MASTER

go
declare
      @isql varchar(2000),
      @dbname varchar(64)
     
      declare c1 cursor for select name from master..sysdatabases where name not in ('master','model','msdb','tempdb')
      open c1
      fetch next from c1 into @dbname
      While @@fetch_status <> -1
            begin     
            select @isql = 'ALTER DATABASE @dbname SET RECOVERY simple'
            select @isql = replace(@isql,'@dbname',@dbname)
            print @isql
            exec(@isql)
           
            fetch next from c1 into @dbname
            end
      close c1
      deallocate c1