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Inserting a string with embedded zero byte only inserts the string up to the first zero byte:
import sqlite3
connection = sqlite3.connect(':memory:')
cursor = connection.cursor()
cursor.execute('CREATE TABLE test (value TEXT)')
cursor.execute('INSERT INTO test (value) VALUES (?)', ('foo\x00bar',))
cursor.execute('SELECT value FROM test')
print(cursor.fetchone())
# expected output: (u'foo\x00bar',)
# actual output: (u'foo',)
Also, if there's already data inserted to a table like above with embedded zero bytes, the sqlite-API-to-Python-string conversion truncates the strings to just before the first zero byte.
Attaching a patch against 3.3 that fixes the problem. Basically, it uses PyUnicode_AsStringAndSize and PyUnicode_FromStringAndSize instead of the non-size variants.
Please review, as I'm not sure it covers each possible case.