+++ /dev/null
-# copy_from.py -- example about copy_from
-#
-# Copyright (C) 2002 Tom Jenkins <tjenkins@devis.com>
-# Copyright (C) 2005 Federico Di Gregorio <fog@initd.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 tis 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 dns:", 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()
-
-# copy_from with default arguments, from open file
-
-io = open('copy_from.txt', 'wr')
-data = ['Tom\tJenkins\t37\n',
- 'Madonna\t\N\t45\n',
- 'Federico\tDi Gregorio\t\N\n']
-io.writelines(data)
-io.close()
-
-io = open('copy_from.txt', 'r')
-curs.copy_from(io, 'test_copy')
-print "1) Copy %d records from file object " % len(data) + \
- "using defaults (sep: \\t and null = \\N)"
-io.close()
-
-curs.execute("SELECT * FROM test_copy")
-rows = curs.fetchall()
-print " Select returned %d rows" % len(rows)
-
-for r in rows:
- print " %s %s\t%s" % (r[0], r[1], r[2])
-curs.execute("delete from test_copy")
-conn.commit()
-
-# copy_from using custom separator, from open file
-
-io = open('copy_from.txt', 'wr')
-data = ['Tom:Jenkins:37\n',
- 'Madonna:\N:45\n',
- 'Federico:Di Gregorio:\N\n']
-io.writelines(data)
-io.close()
-
-io = open('copy_from.txt', 'r')
-curs.copy_from(io, 'test_copy', ':')
-print "2) Copy %d records from file object using sep = :" % len(data)
-io.close()
-
-curs.execute("SELECT * FROM test_copy")
-rows = curs.fetchall()
-print " Select returned %d rows" % len(rows)
-
-for r in rows:
- print " %s %s\t%s" % (r[0], r[1], r[2])
-curs.execute("delete from test_copy")
-conn.commit()
-
-# copy_from using custom null identifier, from open file
-
-io = open('copy_from.txt', 'wr')
-data = ['Tom\tJenkins\t37\n',
- 'Madonna\tNULL\t45\n',
- 'Federico\tDi Gregorio\tNULL\n']
-io.writelines(data)
-io.close()
-
-io = open('copy_from.txt', 'r')
-curs.copy_from(io, 'test_copy', null='NULL')
-print "3) Copy %d records from file object using null = NULL" % len(data)
-io.close()
-
-curs.execute("SELECT * FROM test_copy")
-rows = curs.fetchall()
-print " Select using cursor returned %d rows" % len(rows)
-
-for r in rows:
- print " %s %s\t%s" % (r[0], r[1], r[2])
-curs.execute("delete from test_copy")
-conn.commit()
-
-# copy_from using custom separator and null identifier
-
-io = open('copy_from.txt', 'wr')
-data = ['Tom:Jenkins:37\n', 'Madonna:NULL:45\n', 'Federico:Di Gregorio:NULL\n']
-io.writelines(data)
-io.close()
-
-io = open('copy_from.txt', 'r')
-curs.copy_from(io, 'test_copy', ':', 'NULL')
-print "4) Copy %d records from file object " % len(data) + \
- "using sep = : and null = NULL"
-io.close()
-
-curs.execute("SELECT * FROM test_copy")
-rows = curs.fetchall()
-print " Select using cursor returned %d rows" % len(rows)
-
-for r in rows:
- print " %s %s\t%s" % (r[0], r[1], r[2])
-curs.execute("delete from test_copy")
-conn.commit()
-
-# anything can be used as a file if it has .read() and .readline() methods
-
-data = StringIO.StringIO()
-data.write('\n'.join(['Tom\tJenkins\t37',
- 'Madonna\t\N\t45',
- 'Federico\tDi Gregorio\t\N']))
-data.seek(0)
-
-curs.copy_from(data, 'test_copy')
-print "5) Copy 3 records from StringIO object using defaults"
-
-curs.execute("SELECT * FROM test_copy")
-rows = curs.fetchall()
-print " Select using cursor returned %d rows" % len(rows)
-
-for r in rows:
- print " %s %s\t%s" % (r[0], r[1], r[2])
-curs.execute("delete from test_copy")
-conn.commit()
-
-# simple error test
-
-print "6) About to raise an error"
-data = StringIO.StringIO()
-data.write('\n'.join(['Tom\tJenkins\t37',
- 'Madonna\t\N\t45',
- 'Federico\tDi Gregorio\taaa']))
-data.seek(0)
-
-try:
- curs.copy_from(data, 'test_copy')
-except StandardError, err:
- conn.rollback()
- print " Catched error (as expected):\n", err
-
-conn.rollback()
-
-curs.execute("DROP TABLE test_copy")
-os.unlink('copy_from.txt')
-conn.commit()
-
-
-
git://git.onelab.eu / plcapi.git / blobdiff