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