mirror of
https://github.com/psycopg/psycopg2.git
synced 2024-11-15 05:26:37 +03:00
e335d6d223
Many editors automatically trim whitespace on save. By trimming all files in one go, makes future diffs cleaner without extraneous whitespace changes.
104 lines
2.8 KiB
Python
104 lines
2.8 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)
|
|
|
|
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,
|
|
|
|
# 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,
|
|
|
|
# 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,
|
|
|
|
# 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,
|
|
|
|
curs.execute("DROP TABLE test_copy")
|
|
os.unlink('copy_to.txt')
|
|
conn.commit()
|