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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')
@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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