import sqlite3
conn = sqlite3.connect('emaildb.sqlite')
cur = conn.cursor()
#%%
cur.execute('''
DROP TABLE IF EXISTS Counts''')
cur.execute('''
CREATE TABLE Counts (email TEXT, count INTEGER)''')
#%%
fname = raw_input('Enter file name: ')
if ( len(fname) < 1 ) : fname = 'mbox-short.txt'
fh = open(fname)
for line in fh:
if not line.startswith('From: ') : continue
pieces = line.split()
email = pieces[1]
print( email)
cur.execute('SELECT count FROM Counts WHERE email = ? ', (email, ))
row = cur.fetchone()
if row is None:
cur.execute('''INSERT INTO Counts (email, count)
VALUES ( ?, 1 )''', ( email, ) )
else :
cur.execute('UPDATE Counts SET count=count+1 WHERE email = ?',
(email, ))
# This statement commits outstanding changes to disk each
# time through the loop - the program can be made faster
# by moving the commit so it runs only after the loop completes
conn.commit()
#%%
cur.execute('''
DROP TABLE IF EXISTS Counts''')
cur.execute('''
CREATE TABLE Counts (org TEXT, count INTEGER)''')
fname = 'mbox.txt'
fh = open(fname)
#%%
for line in fh:
if not line.startswith('From: ') : continue
pieces = line.split()
email = pieces[1]
print( email)
mail = email.split("@")
org = mail[1]
cur.execute('SELECT count FROM Counts WHERE org = ? ', (org, ))
row = cur.fetchone()
if row is None:
cur.execute('''INSERT INTO Counts (org, count)
VALUES ( ?, 1 )''', ( org, ) )
else :
cur.execute('UPDATE Counts SET count=count+1 WHERE org = ?',
(org, ))
conn.commit()
#%%
# https://www.sqlite.org/lang_select.html
sqlstr = 'SELECT org, count FROM Counts ORDER BY count DESC LIMIT 70'
print
print ("Counts:")
for row in cur.execute(sqlstr) :
print( str(row[0]), row[1])
#cur.execute('''
#SELECT org, count FROM Counts ORDER BY org DESC LIMIT 30''')
#%%
conn.commit()
cur.close()