In addition to this, and assuming that the data doesn't change
frequently (days vs minutes), maybe a select-cache, with TTL of 24 hours
would help?
http://web2py.com/books/default/chapter/29/06/the-database-abstraction-layer#Caching-selects
________________________________________
Kiran Subbaraman
http://subbaraman.wordpress.com/about/
On Thu, 22-05-2014 7:39 PM, Anthony wrote:
First, you can simplify your function as follows:
|
defgetResults():
tab2results =db(db.Table2.Release==request.vars.release_name).select(
db.Table2.id,db.Table2.Year,orderby=~db.Table2.id)
returnSELECT([OPTION(r.Year,_value=r.id)forr intab2results],
_name='table2_name')
|
I assume request.vars.release_name is actually the db.Table1 id field
value, not a string name, correct (otherwise, the query won't work)?
In the above, insert "return BEAUTIFY(db._timings)" before the final
return, and call the function directly in a browser tab, with
release_name=[some id] in the query string. See how long the above
query is taking in that case. If the query itself is taking several
seconds, try creating an index on the "Release" field.
Anthony
On Thursday, May 22, 2014 9:38:56 AM UTC-4, Sarbjit wrote:
Below is the snippets from code (I have changed few field names as
I can't share the exact field names)
--> Data base
db.define_table('Table1',
Field('Release'),
format='%(Release)s')
db.define_table('Table2',
Field('Release',db.Table1),
Field('Year'),
format='%(Year)s')
db.define_table('Table3',
Field('Manfucturer',writable=False),
Field('MID'),
Field('Year',db.Table2,writable=False),
Field('Engineer'),
Field('Location',writable=False),
Field('Title',writable=False),
Field('Description','text'),
Field('City',writable=False))
db.Table2.Release.requires = IS_IN_DB(db,db.Table1.id
<http://db.Table1.id>,'%(Release)s')
db.Table3.Year.requires = IS_IN_DB(db,db.Table2.id
<http://db.Table2.id>,'%(Year)s')
--> This function is called by AJAX on change of first option in
drop down
def getResults():
tab2results =
db(db.Table2.Release==request.vars.release_name).select(orderby=~db.Table2.id
<http://db.Table2.id>)
result = "<select name='table2_name'>"
for tab2 in tab2results:
print tab2
result += "<option value='" + str(tab2.id
<http://tab2.id>) + "'>" + tab2.Year + "</option>"
result += "</select>"
return XML(result)
No, I don't have an index for the table.
On Thursday, May 22, 2014 6:50:02 PM UTC+5:30, Anthony wrote:
Would still help to see your specific model code. Is the field
in question a reference field with a "represent" attribute? If
so, you'll get separate queries for each item in order to
lookup the represent value. How many records in the table? Do
you have an index on the field being searched? If you execute
the same query in a separate DB client, how long does it take?
Anthony
On Thursday, May 22, 2014 8:37:55 AM UTC-4, Sarbjit wrote:
Hi Anthony,
Code is almost identical to the code posted in slice with
change in field names and number of records. Only
additonal difference is that I am using "orderby" in the
query before returing the results.
Surprisingly, sometime the result appears fast (within 2-3
seconds) but some time it takes long time to populate it.
-Sarbjit
On Thursday, May 22, 2014 4:46:55 PM UTC+5:30, Anthony wrote:
Would help to see some code. 4-5 seconds sounds much
too long.
You might also look into
http://dev.s-cubism.com/plugin_lazy_options_widget
<http://dev.s-cubism.com/plugin_lazy_options_widget>.
Anthony
On Thursday, May 22, 2014 12:17:42 AM UTC-4, Sarbjit
wrote:
Hi,
I am using cascading drop-down based on the slice
posted on
"http://www.web2pyslices.com/slice/show/1526/cascading-drop-down-lists-with-ajax-2
<http://www.web2pyslices.com/slice/show/1526/cascading-drop-down-lists-with-ajax-2>".
In my application, the number of sub-records for
drop-down are typically in range of 50-60, so
every-time I change the first option in drop down,
it takes significant time (around 4-5 seconds) to
populate my second drop down.
I was wondering if there is a way to make this
fast by means of caching or by storing the data
for all the records the first time when user logs
into the system and then using that data. Can some
one please comment on how to address this problem
and if possible, an example would be helpful.
-Sarbjit
--
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
---
You received this message because you are subscribed to the Google
Groups "web2py-users" group.
To unsubscribe from this group and stop receiving emails from it, send
an email to web2py+unsubscr...@googlegroups.com
<mailto:web2py+unsubscr...@googlegroups.com>.
For more options, visit https://groups.google.com/d/optout.
--
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
---
You received this message because you are subscribed to the Google Groups "web2py-users" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to web2py+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
