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import unittest
import sqlparse
from django.db import connection
from django.test import TestCase
@unittest.skipUnless(connection.vendor == "sqlite", "SQLite tests")
class IntrospectionTests(TestCase):
def test_get_primary_key_column(self):
"""
Get the primary key column regardless of whether or not it has
quotation.
"""
testable_column_strings = (
("id", "id"),
("[id]", "id"),
("`id`", "id"),
('"id"', "id"),
("[id col]", "id col"),
("`id col`", "id col"),
('"id col"', "id col"),
)
with connection.cursor() as cursor:
for column, expected_string in testable_column_strings:
sql = "CREATE TABLE test_primary (%s int PRIMARY KEY NOT NULL)" % column
with self.subTest(column=column):
try:
cursor.execute(sql)
field = connection.introspection.get_primary_key_column(
cursor, "test_primary"
)
self.assertEqual(field, expected_string)
finally:
cursor.execute("DROP TABLE test_primary")
def test_get_primary_key_column_pk_constraint(self):
sql = """
CREATE TABLE test_primary(
id INTEGER NOT NULL,
created DATE,
PRIMARY KEY(id)
)
"""
with connection.cursor() as cursor:
try:
cursor.execute(sql)
field = connection.introspection.get_primary_key_column(
cursor,
"test_primary",
)
self.assertEqual(field, "id")
finally:
cursor.execute("DROP TABLE test_primary")
@unittest.skipUnless(connection.vendor == "sqlite", "SQLite tests")
class ParsingTests(TestCase):
def parse_definition(self, sql, columns):
"""Parse a column or constraint definition."""
statement = sqlparse.parse(sql)[0]
tokens = (token for token in statement.flatten() if not token.is_whitespace)
with connection.cursor():
return connection.introspection._parse_column_or_constraint_definition(
tokens, set(columns)
)
def assertConstraint(self, constraint_details, cols, unique=False, check=False):
self.assertEqual(
constraint_details,
{
"unique": unique,
"columns": cols,
"primary_key": False,
"foreign_key": None,
"check": check,
"index": False,
},
)
def test_unique_column(self):
tests = (
('"ref" integer UNIQUE,', ["ref"]),
("ref integer UNIQUE,", ["ref"]),
('"customname" integer UNIQUE,', ["customname"]),
("customname integer UNIQUE,", ["customname"]),
)
for sql, columns in tests:
with self.subTest(sql=sql):
constraint, details, check, _ = self.parse_definition(sql, columns)
self.assertIsNone(constraint)
self.assertConstraint(details, columns, unique=True)
self.assertIsNone(check)
def test_unique_constraint(self):
tests = (
('CONSTRAINT "ref" UNIQUE ("ref"),', "ref", ["ref"]),
("CONSTRAINT ref UNIQUE (ref),", "ref", ["ref"]),
(
'CONSTRAINT "customname1" UNIQUE ("customname2"),',
"customname1",
["customname2"],
),
(
"CONSTRAINT customname1 UNIQUE (customname2),",
"customname1",
["customname2"],
),
)
for sql, constraint_name, columns in tests:
with self.subTest(sql=sql):
constraint, details, check, _ = self.parse_definition(sql, columns)
self.assertEqual(constraint, constraint_name)
self.assertConstraint(details, columns, unique=True)
self.assertIsNone(check)
def test_unique_constraint_multicolumn(self):
tests = (
(
'CONSTRAINT "ref" UNIQUE ("ref", "customname"),',
"ref",
["ref", "customname"],
),
("CONSTRAINT ref UNIQUE (ref, customname),", "ref", ["ref", "customname"]),
)
for sql, constraint_name, columns in tests:
with self.subTest(sql=sql):
constraint, details, check, _ = self.parse_definition(sql, columns)
self.assertEqual(constraint, constraint_name)
self.assertConstraint(details, columns, unique=True)
self.assertIsNone(check)
def test_check_column(self):
tests = (
('"ref" varchar(255) CHECK ("ref" != \'test\'),', ["ref"]),
("ref varchar(255) CHECK (ref != 'test'),", ["ref"]),
(
'"customname1" varchar(255) CHECK ("customname2" != \'test\'),',
["customname2"],
),
(
"customname1 varchar(255) CHECK (customname2 != 'test'),",
["customname2"],
),
)
for sql, columns in tests:
with self.subTest(sql=sql):
constraint, details, check, _ = self.parse_definition(sql, columns)
self.assertIsNone(constraint)
self.assertIsNone(details)
self.assertConstraint(check, columns, check=True)
def test_check_constraint(self):
tests = (
('CONSTRAINT "ref" CHECK ("ref" != \'test\'),', "ref", ["ref"]),
("CONSTRAINT ref CHECK (ref != 'test'),", "ref", ["ref"]),
(
'CONSTRAINT "customname1" CHECK ("customname2" != \'test\'),',
"customname1",
["customname2"],
),
(
"CONSTRAINT customname1 CHECK (customname2 != 'test'),",
"customname1",
["customname2"],
),
)
for sql, constraint_name, columns in tests:
with self.subTest(sql=sql):
constraint, details, check, _ = self.parse_definition(sql, columns)
self.assertEqual(constraint, constraint_name)
self.assertIsNone(details)
self.assertConstraint(check, columns, check=True)
def test_check_column_with_operators_and_functions(self):
tests = (
('"ref" integer CHECK ("ref" BETWEEN 1 AND 10),', ["ref"]),
('"ref" varchar(255) CHECK ("ref" LIKE \'test%\'),', ["ref"]),
(
'"ref" varchar(255) CHECK (LENGTH(ref) > "max_length"),',
["ref", "max_length"],
),
)
for sql, columns in tests:
with self.subTest(sql=sql):
constraint, details, check, _ = self.parse_definition(sql, columns)
self.assertIsNone(constraint)
self.assertIsNone(details)
self.assertConstraint(check, columns, check=True)
def test_check_and_unique_column(self):
tests = (
('"ref" varchar(255) CHECK ("ref" != \'test\') UNIQUE,', ["ref"]),
("ref varchar(255) UNIQUE CHECK (ref != 'test'),", ["ref"]),
)
for sql, columns in tests:
with self.subTest(sql=sql):
constraint, details, check, _ = self.parse_definition(sql, columns)
self.assertIsNone(constraint)
self.assertConstraint(details, columns, unique=True)
self.assertConstraint(check, columns, check=True)
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