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derive_named_parameters falls back to regex on SQL error, refs #1421

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Simon Willison 2021-08-08 20:26:08 -07:00
commit b1fed48a95
2 changed files with 13 additions and 9 deletions
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5
datasette/utils/__init__.py
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@ -1080,11 +1080,12 @@ class StartupError(Exception):
_re_named_parameter = re.compile(":([a-zA-Z0-9_]+)")
async def derive_named_parameters(db, sql):
explain = 'explain {}'.format(sql.strip().rstrip(";"))
explain = "explain {}".format(sql.strip().rstrip(";"))
possible_params = _re_named_parameter.findall(sql)
try:
results = await db.execute(explain, {p: None for p in possible_params})
return [row["p4"].lstrip(":") for row in results if row["opcode"] == "Variable"]
except sqlite3.DatabaseError:
return []
return possible_params

17
tests/test_utils.py
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@ -629,13 +629,16 @@ def test_parse_metadata(content, expected):
@pytest.mark.asyncio
@pytest.mark.parametrize("sql,expected", (
("select 1", []),
("select 1 + :one", ["one"]),
("select 1 + :one + :two", ["one", "two"]),
("select 'bob' || '0:00' || :cat", ["cat"]),
("select this is invalid", []),
))
@pytest.mark.parametrize(
"sql,expected",
(
("select 1", []),
("select 1 + :one", ["one"]),
("select 1 + :one + :two", ["one", "two"]),
("select 'bob' || '0:00' || :cat", ["cat"]),
("select this is invalid :one, :two, :three", ["one", "two", "three"]),
),
)
async def test_derive_named_parameters(sql, expected):
ds = Datasette([], memory=True)
db = ds.get_database("_memory")