Re: [web2py] Re: Getting Too many tables error on GAE , HELP!
Thanks. So when i was student, i used to do joins programatically, that was 7 years ago , and my teacher blame me how bad that design was. Now thats gonna be a useful in NoSQL dbs :). On Mon, Oct 24, 2011 at 7:40 AM, howesc wrote: > it is very much a mindset. joins are expensive no matter what system you > use (well they are not free, though still very fast on a relational system), > so when they build GAE which is supposed to be optimized for web page views, > they disallowed joins. i have a love/hate relationship with it! >
Re: [web2py] Re: Getting Too many tables error on GAE , HELP!
it is very much a mindset. joins are expensive no matter what system you use (well they are not free, though still very fast on a relational system), so when they build GAE which is supposed to be optimized for web page views, they disallowed joins. i have a love/hate relationship with it!
Re: [web2py] Re: Getting Too many tables error on GAE , HELP!
Oh Hell, To join programatically!! Ewww!! Finally bad (relational) database designs are gonna look good in GAE,, I think i am gonna brainwash myself and Jump onto NoSQL Bandwagon too On Sun, Oct 23, 2011 at 5:46 AM, howesc wrote: > the default datastore for GAE is a NOSQL system of key-value pairs. it > does not have the full concept of referenced tables, and does not support a > join operation. > > your options are to flatten your schema, putting all the necessary data in > a single record rather than splitting it into many table, or to query the > first table and then query the second table for the items referenced. I use > a combination of both. > > if you are not in a hurry, sign up for the beta access to SQL on GAE (my > invite was not yet approved so i have not used it yet). Massimo says it's > great. :) > > cfh >
[web2py] Re: Getting Too many tables error on GAE , HELP!
the default datastore for GAE is a NOSQL system of key-value pairs. it does not have the full concept of referenced tables, and does not support a join operation. your options are to flatten your schema, putting all the necessary data in a single record rather than splitting it into many table, or to query the first table and then query the second table for the items referenced. I use a combination of both. if you are not in a hurry, sign up for the beta access to SQL on GAE (my invite was not yet approved so i have not used it yet). Massimo says it's great. :) cfh
[web2py] Re: Getting Too many tables error on GAE , HELP!
So because of join operation , it have problem with DAL over GAE right? What is recommend work around for one to many relationship ? Just use single table? That gonna be awful.. On 10/23/11, Phyo Arkar wrote: > Anyone get this problem? > > I am using web2py 1.98.2 on GAE . > > WHat is the work around for it? > > On 10/23/11, Phyo Arkar wrote: >> def get_totals(): >> response.generic_patterns = ['json'] >> query=(db.item.id==db.sale.id_items) >> total_price = 0 >> total_cost = 0 >> total_items = 0 >> rows = >> db(query).select(db.item.base_price,db.item.price,db.sale.total_items) >> for r in rows: >> total_price += r.item.price * r.sale.total_items >> total_cost += r.item.base_price * r.sale.total_items >> total_items += r.sale.total_items >> profit = total_price - total_cost >> >> return dict(total_price = str(total_price) , total_profit = >> str(profit) , total_items = str(total_items)) >> >> This is waht i am doing. and i am getting this : >> >> Traceback (most recent call last): >> File >> "/base/data/home/apps/s~herspos/1.354149753338895814/gluon/restricted.py", >> line 192, in restricted >> exec ccode in environment >> File >> "/base/data/home/apps/s~herspos/1.354149753338895814/applications/HersPOS/controllers/default.py:get_totals", >> line 218, in >> File >> "/base/data/home/apps/s~herspos/1.354149753338895814/gluon/globals.py", >> line 145, in >> self._caller = lambda f: f() >> File >> "/base/data/home/apps/s~herspos/1.354149753338895814/applications/HersPOS/controllers/default.py:get_totals", >> line 168, in get_totals >> File >> "/base/data/home/apps/s~herspos/1.354149753338895814/gluon/dal.py", >> line 5481, in select >> return self.db._adapter.select(self.query,fields,attributes) >> File >> "/base/data/home/apps/s~herspos/1.354149753338895814/gluon/dal.py", >> line 3292, in select >> (items, tablename, fields) = self.select_raw(query,fields,attributes) >> File >> "/base/data/home/apps/s~herspos/1.354149753338895814/gluon/dal.py", >> line 3240, in select_raw >> tablename = self.get_table(query) >> File >> "/base/data/home/apps/s~herspos/1.354149753338895814/gluon/dal.py", >> line 1052, in get_table >> raise RuntimeError, "Too many tables selected" >> RuntimeError: Too many tables selected >> >> How to not use 2 tables to make a relationship ? Just no relationship >> at all GRR! ? >> >
[web2py] Re: Getting Too many tables error on GAE , HELP!
Anyone get this problem? I am using web2py 1.98.2 on GAE . WHat is the work around for it? On 10/23/11, Phyo Arkar wrote: > def get_totals(): > response.generic_patterns = ['json'] > query=(db.item.id==db.sale.id_items) > total_price = 0 > total_cost = 0 > total_items = 0 > rows = > db(query).select(db.item.base_price,db.item.price,db.sale.total_items) > for r in rows: > total_price += r.item.price * r.sale.total_items > total_cost += r.item.base_price * r.sale.total_items > total_items += r.sale.total_items > profit = total_price - total_cost > > return dict(total_price = str(total_price) , total_profit = > str(profit) , total_items = str(total_items)) > > This is waht i am doing. and i am getting this : > > Traceback (most recent call last): > File > "/base/data/home/apps/s~herspos/1.354149753338895814/gluon/restricted.py", > line 192, in restricted > exec ccode in environment > File > "/base/data/home/apps/s~herspos/1.354149753338895814/applications/HersPOS/controllers/default.py:get_totals", > line 218, in > File > "/base/data/home/apps/s~herspos/1.354149753338895814/gluon/globals.py", > line 145, in > self._caller = lambda f: f() > File > "/base/data/home/apps/s~herspos/1.354149753338895814/applications/HersPOS/controllers/default.py:get_totals", > line 168, in get_totals > File "/base/data/home/apps/s~herspos/1.354149753338895814/gluon/dal.py", > line 5481, in select > return self.db._adapter.select(self.query,fields,attributes) > File "/base/data/home/apps/s~herspos/1.354149753338895814/gluon/dal.py", > line 3292, in select > (items, tablename, fields) = self.select_raw(query,fields,attributes) > File "/base/data/home/apps/s~herspos/1.354149753338895814/gluon/dal.py", > line 3240, in select_raw > tablename = self.get_table(query) > File "/base/data/home/apps/s~herspos/1.354149753338895814/gluon/dal.py", > line 1052, in get_table > raise RuntimeError, "Too many tables selected" > RuntimeError: Too many tables selected > > How to not use 2 tables to make a relationship ? Just no relationship > at all GRR! ? >
