what field type is f_postcode ? what type is the result variable ? On Wednesday, April 16, 2014 2:39:02 PM UTC+2, Rob Goldsmith wrote: > > I tried posting this earlier, but it doesn't seem to have appeared yet - > so apologies if this comes up twice. > > I am writing a web2py application which accepts a UK postcode then > provides information about nearby postcodes. I have tried two methods, both > of which work fine when the number of nearby postcodes is relatively few > (less than a hundred). > > Method 1 uses the *contains *method as follows > > query &= db.t_properties.f_postcode.contains(result) > > where *result *is the list of nearby postcodes > > Method 2 does the query first and then uses *exclude* to eliminate the > unwanted rows as follows > > rows.exclude(lambda row: row.f_postcode not in result) > > However, when the list of postcodes is larger (>about 100), both methods > are failing. Method 1 appears to fail because of inherent limitations of > sqlite (https://sqlite.org/limits.html - SQLITE_LIMIT_VARIABLE_NUMBER - > albeit that refers to a limit of 999 rather than 99). Method 2 fails with > the message: > > <type 'exceptions.RuntimeError'> maximum recursion depth exceeded in cmp > > Now, I'm pretty sure that I can solve it by moving to MySQL or another db > but I'm pretty sure that I'm not doing the query in the optimal way. Can > anyone give any advice as to the correct / most efficient way to accomplish > this? > > thanks > Rob. > >
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