cpython/Doc/includes/sqlite3/text_factory.py
Georg Brandl 8a1e4c4b64 Merged revisions 72661,72675-72677,72679,72712,72801,72820 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

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  r72661 | georg.brandl | 2009-05-15 10:03:03 +0200 (Fr, 15 Mai 2009) | 1 line

  Fix example output for doctest-like demos.
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  r72675 | georg.brandl | 2009-05-16 13:13:21 +0200 (Sa, 16 Mai 2009) | 1 line

  #6034: clarify __reversed__ doc.
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  r72676 | georg.brandl | 2009-05-16 13:14:46 +0200 (Sa, 16 Mai 2009) | 1 line

  #6025: fix signature of parse().
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  r72677 | georg.brandl | 2009-05-16 13:18:55 +0200 (Sa, 16 Mai 2009) | 1 line

  #6009: undocument default argument of Option as deprecated.
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  r72679 | georg.brandl | 2009-05-16 13:24:41 +0200 (Sa, 16 Mai 2009) | 1 line

  Fix about and bugs pages to match real workflow.
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  r72712 | georg.brandl | 2009-05-17 10:55:00 +0200 (So, 17 Mai 2009) | 1 line

  #5935: mention that BROWSER is looked for in PATH.
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  r72801 | georg.brandl | 2009-05-20 20:31:14 +0200 (Mi, 20 Mai 2009) | 1 line

  #6055: refer to "sqlite3" consistently.
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  r72820 | georg.brandl | 2009-05-22 09:23:32 +0200 (Fr, 22 Mai 2009) | 1 line

  Use raise X(y).
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2009-05-25 21:13:36 +00:00

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1.3 KiB
Python

import sqlite3
con = sqlite3.connect(":memory:")
cur = con.cursor()
# Create the table
con.execute("create table person(lastname, firstname)")
AUSTRIA = "\xd6sterreich"
# by default, rows are returned as Unicode
cur.execute("select ?", (AUSTRIA,))
row = cur.fetchone()
assert row[0] == AUSTRIA
# but we can make sqlite3 always return bytestrings ...
con.text_factory = str
cur.execute("select ?", (AUSTRIA,))
row = cur.fetchone()
assert type(row[0]) == str
# the bytestrings will be encoded in UTF-8, unless you stored garbage in the
# database ...
assert row[0] == AUSTRIA.encode("utf-8")
# we can also implement a custom text_factory ...
# here we implement one that will ignore Unicode characters that cannot be
# decoded from UTF-8
con.text_factory = lambda x: str(x, "utf-8", "ignore")
cur.execute("select ?", ("this is latin1 and would normally create errors" +
"\xe4\xf6\xfc".encode("latin1"),))
row = cur.fetchone()
assert type(row[0]) == str
# sqlite3 offers a builtin optimized text_factory that will return bytestring
# objects, if the data is in ASCII only, and otherwise return unicode objects
con.text_factory = sqlite3.OptimizedUnicode
cur.execute("select ?", (AUSTRIA,))
row = cur.fetchone()
assert type(row[0]) == str
cur.execute("select ?", ("Germany",))
row = cur.fetchone()
assert type(row[0]) == str