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"""
Prepared statements tests
"""
import datetime as dt
from decimal import Decimal
import pytest
from psycopg.rows import namedtuple_row
@pytest.mark.parametrize("value", [None, 0, 3])
def test_prepare_threshold_init(conn_cls, dsn, value):
with conn_cls.connect(dsn, prepare_threshold=value) as conn:
assert conn.prepare_threshold == value
def test_dont_prepare(conn):
cur = conn.cursor()
for i in range(10):
cur.execute("select %s::int", [i], prepare=False)
stmts = get_prepared_statements(conn)
assert len(stmts) == 0
def test_do_prepare(conn):
cur = conn.cursor()
cur.execute("select %s::int", [10], prepare=True)
stmts = get_prepared_statements(conn)
assert len(stmts) == 1
def test_auto_prepare(conn):
res = []
for i in range(10):
conn.execute("select %s::int", [0])
stmts = get_prepared_statements(conn)
res.append(len(stmts))
assert res == [0] * 5 + [1] * 5
def test_dont_prepare_conn(conn):
for i in range(10):
conn.execute("select %s::int", [i], prepare=False)
stmts = get_prepared_statements(conn)
assert len(stmts) == 0
def test_do_prepare_conn(conn):
conn.execute("select %s::int", [10], prepare=True)
stmts = get_prepared_statements(conn)
assert len(stmts) == 1
def test_auto_prepare_conn(conn):
res = []
for i in range(10):
conn.execute("select %s", [0])
stmts = get_prepared_statements(conn)
res.append(len(stmts))
assert res == [0] * 5 + [1] * 5
def test_prepare_disable(conn):
conn.prepare_threshold = None
res = []
for i in range(10):
conn.execute("select %s", [0])
stmts = get_prepared_statements(conn)
res.append(len(stmts))
assert res == [0] * 10
assert not conn._prepared._names
assert not conn._prepared._counts
def test_no_prepare_multi(conn):
res = []
for i in range(10):
conn.execute("select 1; select 2")
stmts = get_prepared_statements(conn)
res.append(len(stmts))
assert res == [0] * 10
def test_no_prepare_multi_with_drop(conn):
conn.execute("select 1", prepare=True)
for i in range(10):
conn.execute("drop table if exists noprep; create table noprep()")
stmts = get_prepared_statements(conn)
assert len(stmts) == 0
def test_no_prepare_error(conn):
conn.autocommit = True
for i in range(10):
with pytest.raises(conn.ProgrammingError):
conn.execute("select wat")
stmts = get_prepared_statements(conn)
assert len(stmts) == 0
@pytest.mark.parametrize(
"query",
[
"create table test_no_prepare ()",
pytest.param("notify foo, 'bar'", marks=pytest.mark.crdb_skip("notify")),
"set timezone = utc",
"select num from prepared_test",
"insert into prepared_test (num) values (1)",
"update prepared_test set num = num * 2",
"delete from prepared_test where num > 10",
],
)
def test_misc_statement(conn, query):
conn.execute("create table prepared_test (num int)", prepare=False)
conn.prepare_threshold = 0
conn.execute(query)
stmts = get_prepared_statements(conn)
assert len(stmts) == 1
def test_params_types(conn):
conn.execute(
"select %s, %s, %s",
[dt.date(2020, 12, 10), 42, Decimal(42)],
prepare=True,
)
stmts = get_prepared_statements(conn)
want = [stmt.parameter_types for stmt in stmts]
assert want == [["date", "smallint", "numeric"]]
def test_evict_lru(conn):
conn.prepared_max = 5
for i in range(10):
conn.execute("select 'a'")
conn.execute(f"select {i}")
assert len(conn._prepared._names) == 1
assert conn._prepared._names[b"select 'a'", ()] == b"_pg3_0"
for i in [9, 8, 7, 6]:
assert conn._prepared._counts[f"select {i}".encode(), ()] == 1
stmts = get_prepared_statements(conn)
assert len(stmts) == 1
assert stmts[0].statement == "select 'a'"
def test_evict_lru_deallocate(conn):
conn.prepared_max = 5
conn.prepare_threshold = 0
for i in range(10):
conn.execute("select 'a'")
conn.execute(f"select {i}")
assert len(conn._prepared._names) == 5
for j in [9, 8, 7, 6, "'a'"]:
name = conn._prepared._names[f"select {j}".encode(), ()]
assert name.startswith(b"_pg3_")
stmts = get_prepared_statements(conn)
stmts.sort(key=lambda rec: rec.prepare_time)
got = [stmt.statement for stmt in stmts]
assert got == [f"select {i}" for i in ["'a'", 6, 7, 8, 9]]
def test_different_types(conn):
conn.prepare_threshold = 0
conn.execute("select %s", [None])
conn.execute("select %s", [dt.date(2000, 1, 1)])
conn.execute("select %s", [42])
conn.execute("select %s", [41])
conn.execute("select %s", [dt.date(2000, 1, 2)])
stmts = get_prepared_statements(conn)
stmts.sort(key=lambda rec: rec.prepare_time)
got = [stmt.parameter_types for stmt in stmts]
assert got == [["text"], ["date"], ["smallint"]]
def test_untyped_json(conn):
conn.prepare_threshold = 1
conn.execute("create table testjson(data jsonb)")
for i in range(2):
conn.execute("insert into testjson (data) values (%s)", ["{}"])
stmts = get_prepared_statements(conn)
got = [stmt.parameter_types for stmt in stmts]
assert got == [["jsonb"]]
def test_change_type_execute(conn):
conn.prepare_threshold = 0
for i in range(3):
conn.execute("CREATE TYPE prepenum AS ENUM ('foo', 'bar', 'baz')")
conn.execute("CREATE TABLE preptable(id integer, bar prepenum[])")
conn.cursor().execute(
"INSERT INTO preptable (bar) VALUES (%(enum_col)s::prepenum[])",
{"enum_col": ["foo"]},
)
conn.rollback()
def test_change_type_executemany(conn):
for i in range(3):
conn.execute("CREATE TYPE prepenum AS ENUM ('foo', 'bar', 'baz')")
conn.execute("CREATE TABLE preptable(id integer, bar prepenum[])")
conn.cursor().executemany(
"INSERT INTO preptable (bar) VALUES (%(enum_col)s::prepenum[])",
[{"enum_col": ["foo"]}, {"enum_col": ["foo", "bar"]}],
)
conn.rollback()
@pytest.mark.crdb("skip", reason="can't re-create a type")
def test_change_type(conn):
conn.prepare_threshold = 0
conn.execute("CREATE TYPE prepenum AS ENUM ('foo', 'bar', 'baz')")
conn.execute("CREATE TABLE preptable(id integer, bar prepenum[])")
conn.cursor().execute(
"INSERT INTO preptable (bar) VALUES (%(enum_col)s::prepenum[])",
{"enum_col": ["foo"]},
)
conn.execute("DROP TABLE preptable")
conn.execute("DROP TYPE prepenum")
conn.execute("CREATE TYPE prepenum AS ENUM ('foo', 'bar', 'baz')")
conn.execute("CREATE TABLE preptable(id integer, bar prepenum[])")
conn.cursor().execute(
"INSERT INTO preptable (bar) VALUES (%(enum_col)s::prepenum[])",
{"enum_col": ["foo"]},
)
stmts = get_prepared_statements(conn)
assert len(stmts) == 3
def test_change_type_savepoint(conn):
conn.prepare_threshold = 0
with conn.transaction():
for i in range(3):
with pytest.raises(ZeroDivisionError):
with conn.transaction():
conn.execute("CREATE TYPE prepenum AS ENUM ('foo', 'bar', 'baz')")
conn.execute("CREATE TABLE preptable(id integer, bar prepenum[])")
conn.cursor().execute(
"INSERT INTO preptable (bar) VALUES (%(enum_col)s::prepenum[])",
{"enum_col": ["foo"]},
)
raise ZeroDivisionError()
def get_prepared_statements(conn):
cur = conn.cursor(row_factory=namedtuple_row)
cur.execute(
# CRDB has 'PREPARE name AS' in the statement.
r"""
select name,
regexp_replace(statement, 'prepare _pg3_\d+ as ', '', 'i') as statement,
prepare_time,
parameter_types
from pg_prepared_statements
where name != ''
""",
prepare=False,
)
return cur.fetchall()
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