python 3.x - My sqlite3 cursor has less rows than expected -

-

in following code have 2 cursors first loc_crs should have 3 rows in it. when run program loc_crs seems have 1 row

import db_access  def get_average_measurements_for_area(area_id): """ returns average value of measurements locations in given area. returns none if there no measurements. """ loc_crs = db_access.get_locations_for_area(area_id)  avg = 0 loc_row in loc_crs:      loc_id = int(loc_row['location_id'])     meas_crs = db_access.get_measurements_for_location(loc_id)      meas_row in meas_crs:         meas = float(meas_row['value'])         avg += meas         # print("meas: ", str(meas))      print("loc_id: ", str(loc_id)) print(str(avg))

get_average_measurements_for_area(3)

this output.

loc_id:  16 avg:  568.2259127787871

edit: here methods being called:

def get_locations_for_area(area_id): """ return list of dictionaries giving locations given area. """ cmd = 'select * location location_area ?' crs.execute(cmd, [area_id])  return crs  def get_measurements_for_location(location_id): """ return list of dictionaries giving measurement rows given location. """ cmd = 'select value measurement measurement_location ?' crs.execute(cmd, [location_id]) return crs

here link database: http://cs.kennesaw.edu/~bsetzer/4320su15/extra/databases/measurements/measures.sqlite


Comments

Post a Comment

Popular posts from this blog

python - How to create jsonb index using GIN on SQLAlchemy? -

-
here's current code creating index jsonb. index("mytable_data_idx_id_key", mytable.data['id'].astext, postgresql_using='gin') but got error. sqlalchemy.exc.programmingerror: (psycopg2.programmingerror) data type text has no default operator class access method "gin" hint: must specify operator class index or define default operator class data type. [sql: "create index event_data_idx_id_key on event using gin ((data ->> 'id'))"] is there way create index on sqlalchemy? the postgresql specific sqlalchemy docs @ http://docs.sqlalchemy.org/en/latest/dialects/postgresql.html#operator-classes mention postgresql_ops dictionary provide "operator class" used postgresql, , provide example illustrating use: index('my_index', my_table.c.id, my_table.c.data, postgresql_ops={ 'data': 'text_pattern_ops', ...
Read more

PHP DOM loadHTML() method unusual warning -

-
i had following code works fine on localhost: $document = new domdocument(); $document->loadhtml($p_result); $form = $document->getelementsbytagname('form')->item(0); // code continues using $form variable after same code updated on outside server, loadhtml() failed , issued warning. warning: domdocument::loadhtml() expects parameter 1 valid path, string given in path/name/to/script.php returned null instead of object code pretty gets fatal error. note contents of $p_result absolutely same on outside server , on localhost. but why displays kind of warning , why not work? doesn't loadhtml() expects argument 1 string in first place? why method expects parameter 1 valid path ? just make clear i'm not calling loadhtmlfile() , i'm calling loadhtml() . thanks. you're affected one of php bugs . issue present in php 5.6.8 , 5.6.9. have affected php version on server, , bug-free version on localhost. the bug forbids null ...
Read more

c# - TransactionScope not rolling back although no complete() is called -

-
i'm using transactionscope rollback transaction fail bool errorreported = false; action<importerrorlog> newerrorcallback = e => { errorreported = true; errorcallback(e); }; using (var transaction = new transactionscope()) { foreach (importtaskdefinition task in taskdefinition) { loader.load(streamfile, newerrorcallback, task.destinationtable, processingtaskid); } if (!errorreported) transaction.complete(); } i'm sure there no transactionscope started ahead or after code. i'm using entity framework insert in db. regardless state of errorreported transaction never rolled in case of error. what missing ? transactionscope sets transaction.current . that's does. wants transacted must @ property. i believe ef each time connection opened reason. probably, connection open when scope installed. open connection inside of scope or enlist manually. ef has nasty "design decision": default opens ...
Read more