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fix(django-spanner): backslash-escape string literals in quote_value #18234

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fix(django-spanner): backslash-escape string literals in quote_value #18234

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5 changes: 4 additions & 1 deletion packages/django-google-spanner/django_spanner/schema.py
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Original file line number Diff line number Diff line change
Expand Up @@ -450,7 +450,10 @@ def add_index(self, model, index):
def quote_value(self, value):
# A more complete implementation isn't currently required.
if isinstance(value, str):
return "'%s'" % value.replace("'", "''")
# GoogleSQL string literals use backslash escaping; '' quote
# doubling is not recognized, so escape the backslash first and
# then the quote (matching the db_default/generated inlining above).
return "'%s'" % value.replace("\\", "\\\\").replace("'", "\\'")

@gemini-code-assist gemini-code-assist Bot Aug 27, 2026

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medium

In GoogleSQL, single-quoted string literals cannot contain literal newlines (\n) or carriage returns (\r). If a string containing these characters is passed to quote_value, it will result in a syntax error in Spanner. To prevent this, we should also escape newlines and carriage returns.

Suggested change
return "'%s'" % value.replace("\\", "\\\\").replace("'", "\\'")
return "'%s'" % value.replace("\\", "\\\\").replace("'", "\\'").replace("\n", "\\n").replace("\r", "\\r")

if isinstance(value, bool):
return "TRUE" if value else "FALSE"
return str(value)
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13 changes: 13 additions & 0 deletions packages/django-google-spanner/tests/unit/django_spanner/test_schema.py
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Expand Up @@ -40,6 +40,19 @@ def test_quote_value(self):
schema_editor = DatabaseSchemaEditor(self.connection)
self.assertEqual(schema_editor.quote_value(value=1.1), "1.1")

def test_quote_value_escapes_string(self):
"""
String literals must be backslash-escaped for GoogleSQL. A quote or
backslash in the value must not be able to terminate the literal.
"""
schema_editor = DatabaseSchemaEditor(self.connection)
self.assertEqual(schema_editor.quote_value(value="o'brien"), "'o\\'brien'")
self.assertEqual(schema_editor.quote_value(value="a\\b"), "'a\\\\b'")
self.assertEqual(
schema_editor.quote_value(value="\\'; DROP TABLE t; --"),
"'\\\\\\'; DROP TABLE t; --'",
)

def test_skip_default(self):
"""
Tries skipping default as Cloud spanner doesn't support it.
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