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import testbase
from sqlalchemy import *
from sqlalchemy import exceptions
from testlib import *
class ConstraintTest(AssertMixin):
def setUp(self):
global metadata
metadata = MetaData(testbase.db)
def tearDown(self):
metadata.drop_all()
def test_constraint(self):
employees = Table('employees', metadata,
Column('id', Integer),
Column('soc', String(40)),
Column('name', String(30)),
PrimaryKeyConstraint('id', 'soc')
)
elements = Table('elements', metadata,
Column('id', Integer),
Column('stuff', String(30)),
Column('emp_id', Integer),
Column('emp_soc', String(40)),
PrimaryKeyConstraint('id', name='elements_primkey'),
ForeignKeyConstraint(['emp_id', 'emp_soc'], ['employees.id', 'employees.soc'])
)
metadata.create_all()
def test_circular_constraint(self):
a = Table("a", metadata,
Column('id', Integer, primary_key=True),
Column('bid', Integer),
ForeignKeyConstraint(["bid"], ["b.id"], name="afk")
)
b = Table("b", metadata,
Column('id', Integer, primary_key=True),
Column("aid", Integer),
ForeignKeyConstraint(["aid"], ["a.id"], use_alter=True, name="bfk")
)
metadata.create_all()
def test_circular_constraint_2(self):
a = Table("a", metadata,
Column('id', Integer, primary_key=True),
Column('bid', Integer, ForeignKey("b.id")),
)
b = Table("b", metadata,
Column('id', Integer, primary_key=True),
Column("aid", Integer, ForeignKey("a.id", use_alter=True, name="bfk")),
)
metadata.create_all()
@testing.unsupported('mysql')
def test_check_constraint(self):
foo = Table('foo', metadata,
Column('id', Integer, primary_key=True),
Column('x', Integer),
Column('y', Integer),
CheckConstraint('x>y'))
bar = Table('bar', metadata,
Column('id', Integer, primary_key=True),
Column('x', Integer, CheckConstraint('x>7')),
Column('z', Integer)
)
metadata.create_all()
foo.insert().execute(id=1,x=9,y=5)
try:
foo.insert().execute(id=2,x=5,y=9)
assert False
except exceptions.SQLError:
assert True
bar.insert().execute(id=1,x=10)
try:
bar.insert().execute(id=2,x=5)
assert False
except exceptions.SQLError:
assert True
def test_unique_constraint(self):
foo = Table('foo', metadata,
Column('id', Integer, primary_key=True),
Column('value', String(30), unique=True))
bar = Table('bar', metadata,
Column('id', Integer, primary_key=True),
Column('value', String(30)),
Column('value2', String(30)),
UniqueConstraint('value', 'value2', name='uix1')
)
metadata.create_all()
foo.insert().execute(id=1, value='value1')
foo.insert().execute(id=2, value='value2')
bar.insert().execute(id=1, value='a', value2='a')
bar.insert().execute(id=2, value='a', value2='b')
try:
foo.insert().execute(id=3, value='value1')
assert False
except exceptions.SQLError:
assert True
try:
bar.insert().execute(id=3, value='a', value2='b')
assert False
except exceptions.SQLError:
assert True
def test_index_create(self):
employees = Table('employees', metadata,
Column('id', Integer, primary_key=True),
Column('first_name', String(30)),
Column('last_name', String(30)),
Column('email_address', String(30)))
employees.create()
i = Index('employee_name_index',
employees.c.last_name, employees.c.first_name)
i.create()
assert i in employees.indexes
i2 = Index('employee_email_index',
employees.c.email_address, unique=True)
i2.create()
assert i2 in employees.indexes
def test_index_create_camelcase(self):
"""test that mixed-case index identifiers are legal"""
employees = Table('companyEmployees', metadata,
Column('id', Integer, primary_key=True),
Column('firstName', String(30)),
Column('lastName', String(30)),
Column('emailAddress', String(30)))
employees.create()
i = Index('employeeNameIndex',
employees.c.lastName, employees.c.firstName)
i.create()
i = Index('employeeEmailIndex',
employees.c.emailAddress, unique=True)
i.create()
# Check that the table is useable. This is mostly for pg,
# which can be somewhat sticky with mixed-case identifiers
employees.insert().execute(firstName='Joe', lastName='Smith', id=0)
ss = employees.select().execute().fetchall()
assert ss[0].firstName == 'Joe'
assert ss[0].lastName == 'Smith'
def test_index_create_inline(self):
"""Test indexes defined with tables"""
events = Table('events', metadata,
Column('id', Integer, primary_key=True),
Column('name', String(30), index=True, unique=True),
Column('location', String(30), index=True),
Column('sport', String(30)),
Column('announcer', String(30)),
Column('winner', String(30)))
Index('sport_announcer', events.c.sport, events.c.announcer, unique=True)
Index('idx_winners', events.c.winner)
index_names = [ ix.name for ix in events.indexes ]
assert 'ix_events_name' in index_names
assert 'ix_events_location' in index_names
assert 'sport_announcer' in index_names
assert 'idx_winners' in index_names
assert len(index_names) == 4
capt = []
connection = testbase.db.connect()
# TODO: hacky, put a real connection proxy in
ex = connection._Connection__execute_raw
def proxy(context):
capt.append(context.statement)
capt.append(repr(context.parameters))
ex(context)
connection._Connection__execute_raw = proxy
schemagen = testbase.db.dialect.schemagenerator(testbase.db.dialect, connection)
schemagen.traverse(events)
assert capt[0].strip().startswith('CREATE TABLE events')
s = set([capt[x].strip() for x in [2,4,6,8]])
assert s == set([
'CREATE UNIQUE INDEX ix_events_name ON events (name)',
'CREATE INDEX ix_events_location ON events (location)',
'CREATE UNIQUE INDEX sport_announcer ON events (sport, announcer)',
'CREATE INDEX idx_winners ON events (winner)'
])
# verify that the table is functional
events.insert().execute(id=1, name='hockey finals', location='rink',
sport='hockey', announcer='some canadian',
winner='sweden')
ss = events.select().execute().fetchall()
if __name__ == "__main__":
testbase.main()
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