return SQL table as JSON in python

Here is a really nice example of a pythonic way to do that:

import jsonimport psycopg2def db(database_name='pepe'):    return psycopg2.connect(database=database_name)def query_db(query, args=(), one=False):    cur = db().cursor()    cur.execute(query, args)    r = [dict((cur.description[i][0], value) \               for i, value in enumerate(row)) for row in cur.fetchall()]    cur.connection.close()    return (r[0] if r else None) if one else rmy_query = query_db("select * from majorroadstiger limit %s", (3,))json_output = json.dumps(my_query)

You get an array of JSON objects:

>>> json_output'[{"divroad": "N", "featcat": null, "countyfp": "001",...

Or with the following:

>>> j2 = query_db("select * from majorroadstiger where fullname= %s limit %s",\ ("Mission Blvd", 1), one=True)

you get a single JSON object:

>>> j2 = json.dumps(j2)>>> j2'{"divroad": "N", "featcat": null, "countyfp": "001",...

import sqlite3import jsonDB = "./the_database.db"def get_all_users( json_str = False ):    conn = sqlite3.connect( DB )    conn.row_factory = sqlite3.Row # This enables column access by name: row['column_name']     db = conn.cursor()    rows = db.execute('''    SELECT * from Users    ''').fetchall()    conn.commit()    conn.close()    if json_str:        return json.dumps( [dict(ix) for ix in rows] ) #CREATE JSON    return rows

Callin the method no json...

print get_all_users()

prints:

[(1, u'orvar', u'password123'), (2, u'kalle', u'password123')]

Callin the method with json...

print get_all_users( json_str = True )

prints:

[{"password": "password123", "id": 1, "name": "orvar"}, {"password": "password123", "id": 2, "name": "kalle"}]

Personally I prefer SQLObject for this sort of thing. I adapted some quick-and-dirty test code I had to get this:

import simplejsonfrom sqlobject import *# Replace this with the URI for your actual databaseconnection = connectionForURI('sqlite:/:memory:')sqlhub.processConnection = connection# This defines the columns for your database table. See SQLObject docs for how it# does its conversions for class attributes <-> database columns (underscores to camel# case, generally)class Song(SQLObject):    name = StringCol()    artist = StringCol()    album = StringCol()# Create fake data for demo - this is not needed for the real thingdef MakeFakeDB():    Song.createTable()    s1 = Song(name="B Song",              artist="Artist1",              album="Album1")    s2 = Song(name="A Song",              artist="Artist2",              album="Album2")def Main():    # This is an iterable, not a list    all_songs = Song.select().orderBy(Song.q.name)    songs_as_dict = []    for song in all_songs:        song_as_dict = {            'name' : song.name,            'artist' : song.artist,            'album' : song.album}        songs_as_dict.append(song_as_dict)    print simplejson.dumps(songs_as_dict)if __name__ == "__main__":    MakeFakeDB()    Main()