psycopg2/examples/tz.py

70 lines
2.2 KiB
Python

# tz.py - example of datetime objects with time zones
# -*- encoding: utf8 -*-
#
# Copyright (C) 2004 Federico Di Gregorio <fog@debian.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2, or (at your option) any later
# version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY
# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
# for more details.
## put in DSN your DSN string
DSN = 'dbname=test'
## don't modify anything below this line (except for experimenting)
import sys
import psycopg2
import datetime
from psycopg2.tz import ZERO, LOCAL, FixedOffsetTimezone
if len(sys.argv) > 1:
DSN = sys.argv[1]
print "Opening connection using dns:", DSN
conn = psycopg2.connect(DSN)
curs = conn.cursor()
try:
curs.execute("CREATE TABLE test_tz (t timestamp with time zone)")
except:
conn.rollback()
curs.execute("DROP TABLE test_tz")
curs.execute("CREATE TABLE test_tz (t timestamp with time zone)")
conn.commit()
d = datetime.datetime(1971, 10, 19, 22, 30, 0, tzinfo=LOCAL)
curs.execute("INSERT INTO test_tz VALUES (%s)", (d,))
print "Inserted timestamp with timezone:", d
print "Time zone:", d.tzinfo.tzname(d), "offset:", d.tzinfo.utcoffset(d)
tz = FixedOffsetTimezone(-5*60, "EST")
d = datetime.datetime(1971, 10, 19, 22, 30, 0, tzinfo=tz)
curs.execute("INSERT INTO test_tz VALUES (%s)", (d,))
print "Inserted timestamp with timezone:", d
print "Time zone:", d.tzinfo.tzname(d), "offset:", d.tzinfo.utcoffset(d)
curs.execute("SELECT * FROM test_tz")
d = curs.fetchone()[0]
curs.execute("INSERT INTO test_tz VALUES (%s)", (d,))
print "Inserted SELECTed timestamp:", d
print "Time zone:", d.tzinfo.tzname(d), "offset:", d.tzinfo.utcoffset(d)
curs.execute("SELECT * FROM test_tz")
for d in curs:
u = d[0].utcoffset() or ZERO
print "UTC time: ", d[0] - u
print "Local time:", d[0]
print "Time zone:", d[0].tzinfo.tzname(d[0]), d[0].tzinfo.utcoffset(d[0])
curs.execute("DROP TABLE test_tz")
conn.commit()