cx_Oracle query results to nested dictionary

Question

I need to create a set of dictionaries from Oracle query results.

My data is laid out into station ID, date, time, location, species, and catch weight. For each species, there is a new line, while all the location, etc, data may be redundant.

First, I need to create a keyed dictionary by fieldname and value, such as stationID, date, etc so that when I call, say,

value[1]  (this being the station ID field)

I get

112

The end result is to conglomerate all of the "like" station ID's, dates, etc into one unique key-- with the resulting data (fish catch) being the values.

such as [date,time,location, etc]: cod 47, hake 31, dogfish 5

So far, to get the data parsed into individual keyed dictionaries by field name and then by line I have this:

desc=[d[0] for d in cursor.description]
field=[d[1] for d in cursor.description]
value=dict(zip(desc,field))   
result=[dict(zip(value,line)) for line in cursor]
print result[1]

However, if I try and call value, the field is simply the data type.. how can I get the actual data value? And then nest that into the "result" dictionary that parses each individual sample?

Answer 1

You are zipping together the wrong items. Zip only desc and line, you do not need to use the second item in the cursor.description tuples:

desc=[d[0] for d in cursor.description]
result=[dict(zip(desc, line)) for line in cursor]