1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
|
# encoding.py - show to change client encoding (and test it works)
# -*- encoding: utf8 -*-
#
# Copyright (C) 2004-2010 Federico Di Gregorio <fog@debian.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 psycopg2
import psycopg2.extensions
if len(sys.argv) > 1:
DSN = sys.argv[1]
print("Opening connection using dsn:", DSN)
conn = psycopg2.connect(DSN)
print("Initial encoding for this connection is", conn.encoding)
print("\n** This example is supposed to be run in a UNICODE terminal! **\n")
print("Available encodings:")
encs = psycopg2.extensions.encodings.items()
encs.sort()
for a, b in encs:
print(" ", a, "<->", b)
print("Using STRING typecaster")
print("Setting backend encoding to LATIN1 and executing queries:")
conn.set_client_encoding('LATIN1')
curs = conn.cursor()
curs.execute("SELECT %s::TEXT AS foo", ('àèìòù',))
x = curs.fetchone()[0]
print(" ->", unicode(x, 'latin-1').encode('utf-8'), type(x))
curs.execute("SELECT %s::TEXT AS foo", (u'àèìòù',))
x = curs.fetchone()[0]
print(" ->", unicode(x, 'latin-1').encode('utf-8'), type(x))
print("Setting backend encoding to UTF8 and executing queries:")
conn.set_client_encoding('UNICODE')
curs = conn.cursor()
curs.execute("SELECT %s::TEXT AS foo", (u'àèìòù'.encode('utf-8'),))
x = curs.fetchone()[0]
print(" ->", x, type(x))
curs.execute("SELECT %s::TEXT AS foo", (u'àèìòù',))
x = curs.fetchone()[0]
print(" ->", x, type(x))
print("Using UNICODE typecaster")
psycopg2.extensions.register_type(psycopg2.extensions.UNICODE)
print("Setting backend encoding to LATIN1 and executing queries:")
conn.set_client_encoding('LATIN1')
curs = conn.cursor()
curs.execute("SELECT %s::TEXT AS foo", ('àèìòù',))
x = curs.fetchone()[0]
print(" ->", x.encode('utf-8'), ":", type(x))
curs.execute("SELECT %s::TEXT AS foo", (u'àèìòù',))
x = curs.fetchone()[0]
print(" ->", x.encode('utf-8'), ":", type(x))
print("Setting backend encoding to UTF8 and executing queries:")
conn.set_client_encoding('UNICODE')
curs = conn.cursor()
curs.execute("SELECT %s::TEXT AS foo", (u'àèìòù'.encode('utf-8'),))
x = curs.fetchone()[0]
print(" ->", x.encode('utf-8'), ":", type(x))
curs.execute("SELECT %s::TEXT AS foo", (u'àèìòù',))
x = curs.fetchone()[0]
print(" ->", x.encode('utf-8'), ":", type(x))
print("Executing full UNICODE queries")
print("Setting backend encoding to LATIN1 and executing queries:")
conn.set_client_encoding('LATIN1')
curs = conn.cursor()
curs.execute(u"SELECT %s::TEXT AS foo", ('àèìòù',))
x = curs.fetchone()[0]
print(" ->", x.encode('utf-8'), ":", type(x))
curs.execute(u"SELECT %s::TEXT AS foo", (u'àèìòù',))
x = curs.fetchone()[0]
print(" ->", x.encode('utf-8'), ":", type(x))
print("Setting backend encoding to UTF8 and executing queries:")
conn.set_client_encoding('UNICODE')
curs = conn.cursor()
curs.execute(u"SELECT %s::TEXT AS foo", (u'àèìòù'.encode('utf-8'),))
x = curs.fetchone()[0]
print(" ->", x.encode('utf-8'), ":", type(x))
curs.execute(u"SELECT %s::TEXT AS foo", (u'àèìòù',))
x = curs.fetchone()[0]
print(" ->", x.encode('utf-8'), ":", type(x))
|
