Have all the tables already been created in the slave databases (web2py may be trying to create tables or run migrations)? What happens if you do: db = DAL(shuffle(['connection string']), migrate_enabled=False) Anthony
On Friday, July 22, 2011 9:28:40 AM UTC-4, Nils Olofsson wrote: > Hi, I did something similar, > > if "add" in request.function: > db = DAL(['mysql://Database connection string']) > else: > print "Using Slave Database" > db = DAL(shuffle(['database connection string']) > > That would and uses the slave database (readonly) but, I get this > error message. > > InternalError: (1290, u'The MySQL server is running with the --read- > only option so it cannot execute this statement') > > bar this function "add" and "auth" all other functions read data. > I looked around at the DAL code and could not find a way to tell the > DAL that mysql is read only. > any ideas ? > > Regards, > > Nils > > > On Jul 22, 1:58 pm, Anthony <abas...@gmail.com> wrote: > > You could define 'read_only_actions' anywhere it makes sense, for > example: > > > > read_only_actions = > ['list','another_read_action','yet_another_read_action'] > > if request.function in read_only_actions: > > db =... ... > > else > > db = .... > > > > Of course, if that one 'if' statement is the only place you refer to > > 'read_only_actions', then there's no need to define it as a separate > > variable -- you could just put the list right in the 'if' statement. I > think > > 'read_only_actions' was used in the book example just to indicate the > idea > > that you would use the slave databases for actions that don't need to > write > > to the db -- it's just a stand-in for an actual list of such actions. > > > > Anthony > > > > > > > > > > > > > > > > On Friday, July 22, 2011 6:50:31 AM UTC-4, Nils Olofsson wrote: > > > Hi, > > > I'm still not sure as to how to go about using this. > > > > > Say, I have a controller with the function list: and a function called > > > write: > > > > > if the function is list then read from slaves, if the function is > > > write, write to master. > > > > > So the correct code should be: > > > > > if request.function in read_only_action: > > > db =... ... > > > else > > > db = .... > > > and this is in the model/db.py file. > > > > > I just don't understand where to define read_only_action or it is > > > used ? > > > > > Regards, > > > > > Nils > > > > > On Jul 21, 9:16 pm, Anthony <aba...@gmail.com> wrote: > > > > That's just some (incomplete) example code. You have to define > > > > 'read_only_actions' yourself. In that example, it would be a list > > > functions > > > > that only need to read (but not write) the database and can therefore > be > > > > given access to one of the slave databases. > > > > > > Actually, it looks like the code has an error -- it should say > > > > request.function, not request.action -- I'll make the change. > > > > > > Anthony > > > > > > On Thursday, July 21, 2011 3:54:20 PM UTC-4, Nils Olofsson wrote: > > > > > Hi, > > > > > > > I did this but i got : > > > > > > > Traceback (most recent call last): > > > > > File "/var/www/web2py/gluon/restricted.py", line 192, in > restricted > > > > > exec ccode in environment > > > > > File "/var/www/web2py/applications/Event/models/db.py", line 18, > in > > > > > <module> > > > > > if request.action in read_only_actions: > > > > > NameError: name 'read_only_actions' is not defined > > > > > > > <type 'exceptions.NameError'>(name 'read_only_actions' is not > defined) > > > > > > > This error is the reason i asked where it should go. > > > > > > > Maybe some one could shed some light on it ? > > > > > > > Regards, > > > > > Nils > > > > > > > On Jul 21, 7:44 pm, Anthony <aba...@gmail.com> wrote: > > > > > > It would go in your model file -- the same place where you would > > > normally > > > > > > > > define the db connection. > > > > > > > > Anthony > > > > > > > > On Thursday, July 21, 2011 2:29:45 PM UTC-4, Nils Olofsson wrote: > > > > > > > > Hi Massimo, > > > > > > > > > I'm testing amazon's RDS and EC2 , 1 master many slaves. > > > > > > > > > I could not find out where exactly I am suppose to be putting > this > > > > > > > code. > > > > > > > > > Regards, > > > > > > > > > Nils > > > > > > > > > On Jul 21, 6:48 pm, Massimo Di Pierro <mas...@gmail.com> > > > > > > > wrote: > > > > > > > > You would only use this if you have a replicated database. > I.e. > > > you > > > > > > > > are running many database servers synced with each other. For > > > > > > example: > > > > > > >http://en.wikipedia.org/wiki/Multi-master_replication > > > > > > > > > > On Jul 21, 12:44 pm, Nils Olofsson <nil...@gmail.com> wrote: > > > > > > > > > > > > Hi, > > > > > > > > > > > I see this in the Documentation: > > > > > > > > > > > if request.action in read_only_actions: > > > > > > > > > db = > > > > > DAL(shuffle(['mysql://...1','mysql://...2','mysql://...3'])) > > > > > > > > > else: > > > > > > > > > db = > > > > > DAL(shuffle(['mysql://...3','mysql://...4','mysql://...5'])) > > > > > > > > > > > I'm not sure where exactly I should be using this ? > > > > > > > > > > > And does anyone have some sample code as to how it should > be > > > used ? > > > > > > > > > > > Nils
