mirror of
https://github.com/psycopg/psycopg2.git
synced 2024-11-23 01:16:34 +03:00
105 lines
2.9 KiB
Python
105 lines
2.9 KiB
Python
# copy_to.py -- example about copy_to
|
|
#
|
|
# Copyright (C) 2002 Tom Jenkins <tjenkins@devis.com>
|
|
# Copyright (C) 2005 Federico Di Gregorio <fog@initd.org>
|
|
#
|
|
# psycopg2 is free software: you can redistribute it and/or modify it
|
|
# under the terms of the GNU Lesser General Public License as published
|
|
# by the Free Software Foundation, either version 3 of the License, or
|
|
# (at your option) any later version.
|
|
#
|
|
# psycopg2 is distributed in the hope that it will be useful, but WITHOUT
|
|
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser 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)
|
|
from __future__ import print_function
|
|
|
|
import sys
|
|
import os
|
|
import StringIO
|
|
import psycopg2
|
|
|
|
if len(sys.argv) > 1:
|
|
DSN = sys.argv[1]
|
|
|
|
print("Opening connection using dsn:", DSN)
|
|
conn = psycopg2.connect(DSN)
|
|
print("Encoding for this connection is", conn.encoding)
|
|
|
|
curs = conn.cursor()
|
|
try:
|
|
curs.execute("CREATE TABLE test_copy (fld1 text, fld2 text, fld3 int4)")
|
|
except:
|
|
conn.rollback()
|
|
curs.execute("DROP TABLE test_copy")
|
|
curs.execute("CREATE TABLE test_copy (fld1 text, fld2 text, fld3 int4)")
|
|
conn.commit()
|
|
|
|
# demostrate copy_to functionality
|
|
data = [('Tom', 'Jenkins', '37'),
|
|
('Madonna', None, '45'),
|
|
('Federico', 'Di Gregorio', None)]
|
|
query = "INSERT INTO test_copy VALUES (%s, %s, %s)"
|
|
curs.executemany(query, data)
|
|
conn.commit()
|
|
|
|
# copy_to using defaults
|
|
io = open('copy_to.txt', 'w')
|
|
curs.copy_to(io, 'test_copy')
|
|
print("1) Copy %d records into file object using defaults: " % len (data) + \
|
|
"sep = \\t and null = \\N")
|
|
io.close()
|
|
|
|
rows = open('copy_to.txt', 'r').readlines()
|
|
print(" File has %d rows:" % len(rows))
|
|
|
|
for r in rows:
|
|
print(" ", r, end=' ')
|
|
|
|
# copy_to using custom separator
|
|
io = open('copy_to.txt', 'w')
|
|
curs.copy_to(io, 'test_copy', ':')
|
|
print("2) Copy %d records into file object using sep = :" % len(data))
|
|
io.close()
|
|
|
|
rows = open('copy_to.txt', 'r').readlines()
|
|
print(" File has %d rows:" % len(rows))
|
|
|
|
for r in rows:
|
|
print(" ", r, end=' ')
|
|
|
|
# copy_to using custom null identifier
|
|
io = open('copy_to.txt', 'w')
|
|
curs.copy_to(io, 'test_copy', null='NULL')
|
|
print("3) Copy %d records into file object using null = NULL" % len(data))
|
|
io.close()
|
|
|
|
rows = open('copy_to.txt', 'r').readlines()
|
|
print(" File has %d rows:" % len(rows))
|
|
|
|
for r in rows:
|
|
print(" ", r, end=' ')
|
|
|
|
# copy_to using custom separator and null identifier
|
|
io = open('copy_to.txt', 'w')
|
|
curs.copy_to(io, 'test_copy', ':', 'NULL')
|
|
print("4) Copy %d records into file object using sep = : and null ) NULL" % \
|
|
len(data))
|
|
io.close()
|
|
|
|
rows = open('copy_to.txt', 'r').readlines()
|
|
print(" File has %d rows:" % len(rows))
|
|
|
|
for r in rows:
|
|
print(" ", r, end=' ')
|
|
|
|
curs.execute("DROP TABLE test_copy")
|
|
os.unlink('copy_to.txt')
|
|
conn.commit()
|