# pysqlite2/test/hooks.py: tests for various SQLite-specific hooks
#
# Copyright (C) 2006-2007 Gerhard Häring <[email protected]>
#
# This file is part of pysqlite.
#
# This software is provided 'as-is', without any express or implied
# warranty. In no event will the authors be held liable for any damages
# arising from the use of this software.
#
# Permission is granted to anyone to use this software for any purpose,
# including commercial applications, and to alter it and redistribute it
# freely, subject to the following restrictions:
#
# 1. The origin of this software must not be misrepresented; you must not
# claim that you wrote the original software. If you use this software
# in a product, an acknowledgment in the product documentation would be
# appreciated but is not required.
# 2. Altered source versions must be plainly marked as such, and must not be
# misrepresented as being the original software.
# 3. This notice may not be removed or altered from any source distribution.
import contextlib
import sqlite3 as sqlite
import unittest
from test.support.os_helper import TESTFN, unlink
from .util import memory_database, cx_limit, with_tracebacks
from .util import MemoryDatabaseMixin
class CollationTests(MemoryDatabaseMixin, unittest.TestCase):
def test_create_collation_not_string(self):
with self.assertRaises(TypeError):
self.con.create_collation(None, lambda x, y: (x > y) - (x < y))
def test_create_collation_not_callable(self):
with self.assertRaises(TypeError) as cm:
self.con.create_collation("X", 42)
self.assertEqual(str(cm.exception), 'parameter must be callable')
def test_create_collation_not_ascii(self):
self.con.create_collation("collä", lambda x, y: (x > y) - (x < y))
def test_create_collation_bad_upper(self):
class BadUpperStr(str):
def upper(self):
return None
mycoll = lambda x, y: -((x > y) - (x < y))
self.con.create_collation(BadUpperStr("mycoll"), mycoll)
result = self.con.execute("""
select x from (
select 'a' as x
union
select 'b' as x
) order by x collate mycoll
""").fetchall()
self.assertEqual(result[0][0], 'b')
self.assertEqual(result[1][0], 'a')
def test_collation_is_used(self):
def mycoll(x, y):
# reverse order
return -((x > y) - (x < y))
self.con.create_collation("mycoll", mycoll)
sql = """
select x from (
select 'a' as x
union
select 'b' as x
union
select 'c' as x
) order by x collate mycoll
"""
result = self.con.execute(sql).fetchall()
self.assertEqual(result, [('c',), ('b',), ('a',)],
msg='the expected order was not returned')
self.con.create_collation("mycoll", None)
with self.assertRaises(sqlite.OperationalError) as cm:
result = self.con.execute(sql).fetchall()
self.assertEqual(str(cm.exception), 'no such collation sequence: mycoll')
def test_collation_returns_large_integer(self):
def mycoll(x, y):
# reverse order
return -((x > y) - (x < y)) * 2**32
self.con.create_collation("mycoll", mycoll)
sql = """
select x from (
select 'a' as x
union
select 'b' as x
union
select 'c' as x
) order by x collate mycoll
"""
result = self.con.execute(sql).fetchall()
self.assertEqual(result, [('c',), ('b',), ('a',)],
msg="the expected order was not returned")
def test_collation_register_twice(self):
"""
Register two different collation functions under the same name.
Verify that the last one is actually used.
"""
con = self.con
con.create_collation("mycoll", lambda x, y: (x > y) - (x < y))
con.create_collation("mycoll", lambda x, y: -((x > y) - (x < y)))
result = con.execute("""
select x from (select 'a' as x union select 'b' as x) order by x collate mycoll
""").fetchall()
self.assertEqual(result[0][0], 'b')
self.assertEqual(result[1][0], 'a')
def test_deregister_collation(self):
"""
Register a collation, then deregister it. Make sure an error is raised if we try
to use it.
"""
con = self.con
con.create_collation("mycoll", lambda x, y: (x > y) - (x < y))
con.create_collation("mycoll", None)
with self.assertRaises(sqlite.OperationalError) as cm:
con.execute("select 'a' as x union select 'b' as x order by x collate mycoll")
self.assertEqual(str(cm.exception), 'no such collation sequence: mycoll')
class ProgressTests(MemoryDatabaseMixin, unittest.TestCase):
def test_progress_handler_used(self):
"""
Test that the progress handler is invoked once it is set.
"""
progress_calls = []
def progress():
progress_calls.append(None)
return 0
self.con.set_progress_handler(progress, 1)
self.con.execute("""
create table foo(a, b)
""")
self.assertTrue(progress_calls)
def test_opcode_count(self):
"""
Test that the opcode argument is respected.
"""
con = self.con
progress_calls = []
def progress():
progress_calls.append(None)
return 0
con.set_progress_handler(progress, 1)
curs = con.cursor()
curs.execute("""
create table foo (a, b)
""")
first_count = len(progress_calls)
progress_calls = []
con.set_progress_handler(progress, 2)
curs.execute("""
create table bar (a, b)
""")
second_count = len(progress_calls)
self.assertGreaterEqual(first_count, second_count)
def test_cancel_operation(self):
"""
Test that returning a non-zero value stops the operation in progress.
"""
def progress():
return 1
self.con.set_progress_handler(progress, 1)
curs = self.con.cursor()
self.assertRaises(
sqlite.OperationalError,
curs.execute,
"create table bar (a, b)")
def test_clear_handler(self):
"""
Test that setting the progress handler to None clears the previously set handler.
"""
con = self.con
action = 0
def progress():
nonlocal action
action = 1
return 0
con.set_progress_handler(progress, 1)
con.set_progress_handler(None, 1)
con.execute("select 1 union select 2 union select 3").fetchall()
self.assertEqual(action, 0, "progress handler was not cleared")
@with_tracebacks(ZeroDivisionError, name="bad_progress")
def test_error_in_progress_handler(self):
def bad_progress():
1 / 0
self.con.set_progress_handler(bad_progress, 1)
with self.assertRaises(sqlite.OperationalError):
self.con.execute("""
create table foo(a, b)
""")
@with_tracebacks(ZeroDivisionError, name="bad_progress")
def test_error_in_progress_handler_result(self):
class BadBool:
def __bool__(self):
1 / 0
def bad_progress():
return BadBool()
self.con.set_progress_handler(bad_progress, 1)
with self.assertRaises(sqlite.OperationalError):
self.con.execute("""
create table foo(a, b)
""")
def test_progress_handler_keyword_args(self):
regex = (
r"Passing keyword argument 'progress_handler' to "
r"_sqlite3.Connection.set_progress_handler\(\) is deprecated. "
r"Parameter 'progress_handler' will become positional-only in "
r"Python 3.15."
)
with self.assertWarnsRegex(DeprecationWarning, regex) as cm:
self.con.set_progress_handler(progress_handler=lambda: None, n=1)
self.assertEqual(cm.filename, __file__)
class TraceCallbackTests(MemoryDatabaseMixin, unittest.TestCase):
@contextlib.contextmanager
def check_stmt_trace(self, cx, expected):
try:
traced = []
cx.set_trace_callback(lambda stmt: traced.append(stmt))
yield
finally:
self.assertEqual(traced, expected)
cx.set_trace_callback(None)
def test_trace_callback_used(self):
"""
Test that the trace callback is invoked once it is set.
"""
traced_statements = []
def trace(statement):
traced_statements.append(statement)
self.con.set_trace_callback(trace)
self.con.execute("create table foo(a, b)")
self.assertTrue(traced_statements)
self.assertTrue(any("create table foo" in stmt for stmt in traced_statements))
def test_clear_trace_callback(self):
"""
Test that setting the trace callback to None clears the previously set callback.
"""
con = self.con
traced_statements = []
def trace(statement):
traced_statements.append(statement)
con.set_trace_callback(trace)
con.set_trace_callback(None)
con.execute("create table foo(a, b)")
self.assertFalse(traced_statements, "trace callback was not cleared")
def test_unicode_content(self):
"""
Test that the statement can contain unicode literals.
"""
unicode_value = '\xf6\xe4\xfc\xd6\xc4\xdc\xdf\u20ac'
con = self.con
traced_statements = []
def trace(statement):
traced_statements.append(statement)
con.set_trace_callback(trace)
con.execute("create table foo(x)")
con.execute("insert into foo(x) values ('%s')" % unicode_value)
con.commit()
self.assertTrue(any(unicode_value in stmt for stmt in traced_statements),
"Unicode data %s garbled in trace callback: %s"
% (ascii(unicode_value), ', '.join(map(ascii, traced_statements))))
def test_trace_callback_content(self):
# set_trace_callback() shouldn't produce duplicate content (bpo-26187)
traced_statements = []
def trace(statement):
traced_statements.append(statement)
queries = ["create table foo(x)",
"insert into foo(x) values(1)"]
self.addCleanup(unlink, TESTFN)
con1 = sqlite.connect(TESTFN, isolation_level=None)
con2 = sqlite.connect(TESTFN)
try:
con1.set_trace_callback(trace)
cur = con1.cursor()
cur.execute(queries[0])
con2.execute("create table bar(x)")
cur.execute(queries[1])
finally:
con1.close()
con2.close()
self.assertEqual(traced_statements, queries)
def test_trace_expanded_sql(self):
expected = [
"create table t(t)",
"BEGIN ",
"insert into t values(0)",
"insert into t values(1)",
"insert into t values(2)",
"COMMIT",
]
with memory_database() as cx, self.check_stmt_trace(cx, expected):
with cx:
cx.execute("create table t(t)")
cx.executemany("insert into t values(?)", ((v,) for v in range(3)))
@with_tracebacks(
sqlite.DataError,
regex="Expanded SQL string exceeds the maximum string length"
)
def test_trace_too_much_expanded_sql(self):
# If the expanded string is too large, we'll fall back to the
# unexpanded SQL statement.
# The resulting string length is limited by the runtime limit
# SQLITE_LIMIT_LENGTH.
template = "select 1 as a where a="
category = sqlite.SQLITE_LIMIT_LENGTH
with memory_database() as cx, cx_limit(cx, category=category) as lim:
ok_param = "a"
bad_param = "a" * lim
unexpanded_query = template + "?"
expected = [unexpanded_query]
with self.check_stmt_trace(cx, expected):
cx.execute(unexpanded_query, (bad_param,))
expanded_query = f"{template}'{ok_param}'"
with self.check_stmt_trace(cx, [expanded_query]):
cx.execute(unexpanded_query, (ok_param,))
@with_tracebacks(ZeroDivisionError, regex="division by zero")
def test_trace_bad_handler(self):
with memory_database() as cx:
cx.set_trace_callback(lambda stmt: 5/0)
cx.execute("select 1")
def test_trace_keyword_args(self):
regex = (
r"Passing keyword argument 'trace_callback' to "
r"_sqlite3.Connection.set_trace_callback\(\) is deprecated. "
r"Parameter 'trace_callback' will become positional-only in "
r"Python 3.15."
)
with self.assertWarnsRegex(DeprecationWarning, regex) as cm:
self.con.set_trace_callback(trace_callback=lambda: None)
self.assertEqual(cm.filename, __file__)
if __name__ == "__main__":
unittest.main()
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